gdal

package module
v0.0.0-...-82163bd Latest Latest
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 Go to latest Published: Jan 31, 2023 License: BSD-3-Clause Imports: 6 Imported by: 0

README 

-------------
About
-------------

The gdal.go package provides a go wrapper for GDAL, the Geospatial Data Abstraction Library. More information about GDAL can be found at http://www.gdal.org

This has been forked from github.com/lukeroth/gdal, and is targeting GDAL 2.x.
This is not ready for general use and is a work in progress.

-------------
Installation
-------------

1) go get github.com/lukeroth/gdal
2) Set the GDAL library and include directories to the appropriate locations.
3) go build

-------------
Compatibility
-------------

This software has been tested most recently on Windows 7, using MinGW32_x64, GDAL version 1.11.

-------------
Examples
-------------

-------------
Status (4/17/2015)
-------------

The majority of GDAL functionality exposed by the C API is available, as well as much of the OGR API.
Most functionality is not yet covered by tests or benchmarks.

Documentation

Overview

Package gdal provides a wrapper for GDAL, the Geospatial Data Abstraction Library. This C/C++ library provides access to a large number of geospatial raster data formats. It also contains a wrapper for the related OGR Simple Feature Library which provides similar functionality for vector formats.

Limitations

Some less oftenly used functions are not yet implemented. The majoriry of these involve style tables, asynchronous I/O, and GCPs.

The documentation is fairly limited, but the functionality fairly closely matches that of the C++ api.

This wrapper has most recently been tested on Windows7, using the MinGW32_x64 compiler and GDAL version 1.11.

Usage

A simple program to create a georeferenced blank 256x256 GeoTIFF: 

package main

import (
	"fmt"
	"flag"
	gdal "github.com/lukeroth/gdal_go"
)

func main() {
	flag.Parse()
	filename := flag.Arg(0)
	if filename == "" {
		fmt.Printf("Usage: test_tiff [filename]\n")
		return
	}
	buffer := make([]uint8, 256 * 256)

	driver, err := gdal.GetDriverByName("GTiff")
	if err != nil {
		fmt.Println(err.Error())
		return
	}

	dataset := driver.Create(filename, 256, 256, 1, gdal.Byte, nil)
	defer dataset.Close()

	spatialRef := gdal.CreateSpatialReference("")
	spatialRef.FromEPSG(3857)
	srString, err := spatialRef.ToWKT()
	dataset.SetProjection(srString)
	dataset.SetGeoTransform([]float64{444720, 30, 0, 3751320, 0, -30})
	raster := dataset.RasterBand(1)
	raster.IO(gdal.Write, 0, 0, 256, 256, buffer, 256, 256, 0, 0)
}

More examples can be found in the ./examples subdirectory.

Index

Constants

View Source 
const (
	InverseDistanceToAPower                = GridAlgorithm(C.GGA_InverseDistanceToAPower)
	MovingAverage                          = GridAlgorithm(C.GGA_MovingAverage)
	NearestNeighbor                        = GridAlgorithm(C.GGA_NearestNeighbor)
	MetricMinimum                          = GridAlgorithm(C.GGA_MetricMinimum)
	MetricMaximum                          = GridAlgorithm(C.GGA_MetricMaximum)
	MetricRange                            = GridAlgorithm(C.GGA_MetricRange)
	MetricCount                            = GridAlgorithm(C.GGA_MetricCount)
	MetricAverageDistance                  = GridAlgorithm(C.GGA_MetricAverageDistance)
	MetricAverageDistancePts               = GridAlgorithm(C.GGA_MetricAverageDistancePts)
	Linear                                 = GridAlgorithm(C.GGA_Linear)
	InverseDistanceToAPowerNearestNeighbor = GridAlgorithm(C.GGA_InverseDistanceToAPowerNearestNeighbor)
)
View Source 
const (
	// Grayscale (in GDALColorEntry.c1)
	PI_Gray = PaletteInterp(C.GPI_Gray)
	// Red, Green, Blue and Alpha in (in c1, c2, c3 and c4)
	PI_RGB = PaletteInterp(C.GPI_RGB)
	// Cyan, Magenta, Yellow and Black (in c1, c2, c3 and c4)
	PI_CMYK = PaletteInterp(C.GPI_CMYK)
	// Hue, Lightness and Saturation (in c1, c2, and c3)
	PI_HLS = PaletteInterp(C.GPI_HLS)
)
View Source 
const (
	VERSION_MAJOR = int(C.GDAL_VERSION_MAJOR)
	VERSION_MINOR = int(C.GDAL_VERSION_MINOR)
	VERSION_REV   = int(C.GDAL_VERSION_REV)
	VERSION_BUILD = int(C.GDAL_VERSION_BUILD)
	VERSION_NUM   = int(C.GDAL_VERSION_NUM)
	RELEASE_DATE  = int(C.GDAL_RELEASE_DATE)
	RELEASE_NAME  = string(C.GDAL_RELEASE_NAME)
)
View Source 
const (
	Unknown  = DataType(C.GDT_Unknown)
	Byte     = DataType(C.GDT_Byte)
	UInt16   = DataType(C.GDT_UInt16)
	Int16    = DataType(C.GDT_Int16)
	UInt32   = DataType(C.GDT_UInt32)
	Int32    = DataType(C.GDT_Int32)
	Float32  = DataType(C.GDT_Float32)
	Float64  = DataType(C.GDT_Float64)
	CInt16   = DataType(C.GDT_CInt16)
	CInt32   = DataType(C.GDT_CInt32)
	CFloat32 = DataType(C.GDT_CFloat32)
	CFloat64 = DataType(C.GDT_CFloat64)
)
View Source 
const (
	AR_Pending  = AsyncStatusType(C.GARIO_PENDING)
	AR_Update   = AsyncStatusType(C.GARIO_UPDATE)
	AR_Error    = AsyncStatusType(C.GARIO_ERROR)
	AR_Complete = AsyncStatusType(C.GARIO_COMPLETE)
)
View Source 
const (
	// Read only (no update) access
	ReadOnly = Access(C.GA_ReadOnly)
	// Read/write access.
	Update = Access(C.GA_Update)

	// Allow raster and vector drivers to be used.
	AllDrivers = Access(C.GDAL_OF_ALL)

	// Allow raster drivers to be used.
	RasterDrivers = Access(C.GDAL_OF_RASTER)

	// Allow vector drivers to be used.
	VectorDrivers = Access(C.GDAL_OF_VECTOR)

	// Allow gnm drivers to be used.
	GNMDrivers = Access(C.GDAL_OF_GNM)

	// Unsure
	KindMask = Access(C.GDAL_OF_KIND_MASK)

	// Open in shared mode.
	Shared = Access(C.GDAL_OF_SHARED)

	// Emit error message in case of failed open.
	Verbose = Access(C.GDAL_OF_VERBOSE_ERROR)

	// Open as internal dataset. Such dataset isn't registered in the global list
	// of opened dataset. Cannot be used with GDAL_OF_SHARED.
	Internal = Access(C.GDAL_OF_INTERNAL)
)
View Source 
const (
	// Read data
	Read = RWFlag(C.GF_Read)
	// Write data
	Write = RWFlag(C.GF_Write)
)
View Source 
const (
	CI_Undefined      = ColorInterp(C.GCI_Undefined)
	CI_GrayIndex      = ColorInterp(C.GCI_GrayIndex)
	CI_PaletteIndex   = ColorInterp(C.GCI_PaletteIndex)
	CI_RedBand        = ColorInterp(C.GCI_RedBand)
	CI_GreenBand      = ColorInterp(C.GCI_GreenBand)
	CI_BlueBand       = ColorInterp(C.GCI_BlueBand)
	CI_AlphaBand      = ColorInterp(C.GCI_AlphaBand)
	CI_HueBand        = ColorInterp(C.GCI_HueBand)
	CI_SaturationBand = ColorInterp(C.GCI_SaturationBand)
	CI_LightnessBand  = ColorInterp(C.GCI_LightnessBand)
	CI_CyanBand       = ColorInterp(C.GCI_CyanBand)
	CI_MagentaBand    = ColorInterp(C.GCI_MagentaBand)
	CI_YellowBand     = ColorInterp(C.GCI_YellowBand)
	CI_BlackBand      = ColorInterp(C.GCI_BlackBand)
	CI_YCbCr_YBand    = ColorInterp(C.GCI_YCbCr_YBand)
	CI_YCbCr_CbBand   = ColorInterp(C.GCI_YCbCr_CbBand)
	CI_YCbCr_CrBand   = ColorInterp(C.GCI_YCbCr_CrBand)
	CI_Max            = ColorInterp(C.GCI_Max)
)
View Source 
const (
	MD_AREA_OR_POINT = string(C.GDALMD_AREA_OR_POINT)
	MD_AOP_AREA      = string(C.GDALMD_AOP_AREA)
	MD_AOP_POINT     = string(C.GDALMD_AOP_POINT)
)

"well known" metadata items.

View Source 
const (
	DMD_LONGNAME           = string(C.GDAL_DMD_LONGNAME)
	DMD_HELPTOPIC          = string(C.GDAL_DMD_HELPTOPIC)
	DMD_MIMETYPE           = string(C.GDAL_DMD_MIMETYPE)
	DMD_EXTENSION          = string(C.GDAL_DMD_EXTENSION)
	DMD_CREATIONOPTIONLIST = string(C.GDAL_DMD_CREATIONOPTIONLIST)
	DMD_CREATIONDATATYPES  = string(C.GDAL_DMD_CREATIONDATATYPES)
	DCAP_CREATE            = string(C.GDAL_DCAP_CREATE)
	DCAP_CREATECOPY        = string(C.GDAL_DCAP_CREATECOPY)
	DCAP_VIRTUALIO         = string(C.GDAL_DCAP_VIRTUALIO)
)
View Source 
const (
	GRA_NearestNeighbour = ResampleAlg(0)
	GRA_Bilinear         = ResampleAlg(1)
	GRA_Cubic            = ResampleAlg(2)
	GRA_CubicSpline      = ResampleAlg(3)
	GRA_Lanczos          = ResampleAlg(4)
)
View Source 
const (
	GT_Unknown               = GeometryType(C.wkbUnknown)
	GT_Point                 = GeometryType(C.wkbPoint)
	GT_LineString            = GeometryType(C.wkbLineString)
	GT_Polygon               = GeometryType(C.wkbPolygon)
	GT_MultiPoint            = GeometryType(C.wkbMultiPoint)
	GT_MultiLineString       = GeometryType(C.wkbMultiLineString)
	GT_MultiPolygon          = GeometryType(C.wkbMultiPolygon)
	GT_GeometryCollection    = GeometryType(C.wkbGeometryCollection)
	GT_None                  = GeometryType(C.wkbNone)
	GT_LinearRing            = GeometryType(C.wkbLinearRing)
	GT_Point25D              = GeometryType(C.wkbPoint25D)
	GT_LineString25D         = GeometryType(C.wkbLineString25D)
	GT_Polygon25D            = GeometryType(C.wkbPolygon25D)
	GT_MultiPoint25D         = GeometryType(C.wkbMultiPoint25D)
	GT_MultiLineString25D    = GeometryType(C.wkbMultiLineString25D)
	GT_MultiPolygon25D       = GeometryType(C.wkbMultiPolygon25D)
	GT_GeometryCollection25D = GeometryType(C.wkbGeometryCollection25D)
)
View Source 
const (
	FT_Integer     = FieldType(C.OFTInteger)
	FT_IntegerList = FieldType(C.OFTIntegerList)
	FT_Real        = FieldType(C.OFTReal)
	FT_RealList    = FieldType(C.OFTRealList)
	FT_String      = FieldType(C.OFTString)
	FT_StringList  = FieldType(C.OFTStringList)
	FT_Binary      = FieldType(C.OFTBinary)
	FT_Date        = FieldType(C.OFTDate)
	FT_Time        = FieldType(C.OFTTime)
	FT_DateTime    = FieldType(C.OFTDateTime)
)
View Source 
const (
	J_Undefined = Justification(C.OJUndefined)
	J_Left      = Justification(C.OJLeft)
	J_Right     = Justification(C.OJRight)
)
View Source 
const (
	GFT_Integer = RATFieldType(C.GFT_Integer)
	GFT_Real    = RATFieldType(C.GFT_Real)
	GFT_String  = RATFieldType(C.GFT_String)
)
View Source 
const (
	GFU_Generic    = RATFieldUsage(C.GFU_Generic)
	GFU_PixelCount = RATFieldUsage(C.GFU_PixelCount)
	GFU_Name       = RATFieldUsage(C.GFU_Name)
	GFU_Min        = RATFieldUsage(C.GFU_Min)
	GFU_Max        = RATFieldUsage(C.GFU_Max)
	GFU_MinMax     = RATFieldUsage(C.GFU_MinMax)
	GFU_Red        = RATFieldUsage(C.GFU_Red)
	GFU_Green      = RATFieldUsage(C.GFU_Green)
	GFU_Blue       = RATFieldUsage(C.GFU_Blue)
	GFU_Alpha      = RATFieldUsage(C.GFU_Alpha)
	GFU_RedMin     = RATFieldUsage(C.GFU_RedMin)
	GFU_GreenMin   = RATFieldUsage(C.GFU_GreenMin)
	GFU_BlueMin    = RATFieldUsage(C.GFU_BlueMin)
	GFU_AlphaMin   = RATFieldUsage(C.GFU_AlphaMin)
	GFU_RedMax     = RATFieldUsage(C.GFU_RedMax)
	GFU_GreenMax   = RATFieldUsage(C.GFU_GreenMax)
	GFU_BlueMax    = RATFieldUsage(C.GFU_BlueMax)
	GFU_AlphaMax   = RATFieldUsage(C.GFU_AlphaMax)
	GFU_MaxCount   = RATFieldUsage(C.GFU_MaxCount)
)

Variables

View Source 
var (
	ErrDebug   = errors.New("Debug Error")
	ErrWarning = errors.New("Warning Error")
	ErrFailure = errors.New("Failure Error")
	ErrFatal   = errors.New("Fatal Error")
	ErrIllegal = errors.New("Illegal Error")
)
View Source 
var (
	ErrOGRNotEnoughData           = errors.New("not enough data")
	ErrOGRNotEnoughMemory         = errors.New("not enough memory")
	ErrOGRUnsupportedGeometryType = errors.New("unsupported geometry type")
	ErrOGRUnsupportedOperation    = errors.New("unsupported operation")
	ErrOGRCorruptData             = errors.New("corrupt data")
	ErrOGRFailure                 = errors.New("failure")
	ErrOGRUnsupportedSRS          = errors.New("unsupported SRS")
	ErrOGRInvalidHandle           = errors.New("invalid handle")
	ErrOGRNonExistingFeature      = errors.New("non-existing feature")
	EOL                           = errors.New("end of features")
)

OGR errors

View Source 
var ErrIllegalBand = errors.New("illegal band #")

ErrInvalidBand represents an invalid band number when requested. It is set when the return from GDALGetRasterBand(n) is NULL.

View Source 
var ErrInvalidDriver = errors.New("driver not found")

Functions

func BoolToCInt 

func BoolToCInt(in bool) (out C.int)

Convert a go bool to a C int

func CIntSliceToInt 

func CIntSliceToInt(data []C.GUIntBig) []uint64

Safe array conversion

func CleanupOGR 

func CleanupOGR()

Clean up all OGR related resources

func CleanupSR 

func CleanupSR()

Cleanup cached SRS related memory

func ComputeMedianCutPCT 

func ComputeMedianCutPCT(
	red, green, blue *RasterBand,
	colors int,
	ct ColorTable,
	progress ProgressFunc,
	data interface{},
) int

Compute optimal PCT for RGB image

func ConfigOption 

func ConfigOption(key, def string) string

ConfigOption reads an internal configuration option.

The value is the value of a (key, value) option set with CPLSetConfigOption(). If the given option was no defined with CPLSetConfigOption(), it tries to find it in environment variables.

Note: the string returned by CPLGetConfigOption() might be short-lived, and in particular it will become invalid after a call to CPLSetConfigOption() with the same key.

To override temporary a potentially existing option with a new value, you can use the following snippet : 

// backup old value
const char* pszOldValTmp = CPLGetConfigOption(pszKey, NULL);
char* pszOldVal = pszOldValTmp ? CPLStrdup(pszOldValTmp) : NULL;
// override with new value
CPLSetConfigOption(pszKey, pszNewVal);
// do something useful
// restore old value
CPLSetConfigOption(pszKey, pszOldVal);
CPLFree(pszOldVal);

see SetConfigOption()

http://trac.osgeo.org/gdal/wiki/ConfigOptions

func CreateScaledProgress 

func CreateScaledProgress(min, max float64, progress ProgressFunc, data unsafe.Pointer) unsafe.Pointer

func DestroyDriverManager 

func DestroyDriverManager()

Destroy the driver manager

func DestroyScaledProgress 

func DestroyScaledProgress(data unsafe.Pointer)

func DitherRGB2PCT 

func DitherRGB2PCT(
	red, green, blue, target *RasterBand,
	ct ColorTable,
	progress ProgressFunc,
	data interface{},
) int

24bit to 8bit conversion with dithering

func DummyProgress 

func DummyProgress(complete float64, message string, data interface{}) int

func FlushCacheBlock 

func FlushCacheBlock() bool

Try to flush one cached raster block

func GetCacheMax 

func GetCacheMax() int

Get maximum cache memory

func GetCacheUsed 

func GetCacheUsed() int

Get cache memory used

func GetDriverCount 

func GetDriverCount() int

Fetch the number of registered drivers.

func Grid 

func Grid(
	algorithm GridAlgorithm,
	options interface{},
	x, y, z []float64,
	xmin, xmax float64,
	ymin, ymax float64,
	xsize, ysize uint32,
	buffer interface{},
	progress ProgressFunc,
	data interface{},
) error

Fill selected raster regions by interpolation from the edges

func HTTPEnabled 

func HTTPEnabled() bool

HTTPEnabled returns if CPLHTTP services can be useful

Those services depend on GDAL being build with libcurl support.

func IntSliceToCInt 

func IntSliceToCInt(data []int) []C.int

Safe array conversion

func InvGeoTransform 

func InvGeoTransform(transform [6]float64) [6]float64

Invert the supplied transform

func OGRDriverCount 

func OGRDriverCount() int

Fetch the number of registered drivers

func OpenDataSourceCount 

func OpenDataSourceCount() int

Return the number of opened data sources

func ParameterInfo 

func ParameterInfo(
	projectionMethod, parameterName string,
) (
	username, paramType string,
	defaultValue float64,
	ok bool,
)

Fetch information about a single parameter of a projection method

func ParameterList 

func ParameterList(method string) (params []string, name string)

Fetch the parameters for a given projection method

func PopHandler 

func PopHandler()

PopHandler pops the current error handler off of the error handling function stack.

func ProjectionMethods 

func ProjectionMethods() []string

Fetch list of possible projection methods

func PushQuietHandler 

func PushQuietHandler()

PushQuietHandler installs the no-op error handling mechanism in GDAL. No output is printed out for warnings or errors. Use PopHandler() to uninstall the quiet handler.

func ScaledProgress 

func ScaledProgress(complete float64, message string, data interface{}) int

func SetCacheMax 

func SetCacheMax(bytes int)

Set maximum cache memory

func SetConfigOption 

func SetConfigOption(key, value string)

SetConfigOption

Set a configuration option for GDAL/OGR use.

Those options are defined as a (key, value) couple. The value corresponding to a key can be got later with the CPLGetConfigOption() method.

This mechanism is similar to environment variables, but options set with CPLSetConfigOption() overrides, for CPLGetConfigOption() point of view, values defined in the environment.

If CPLSetConfigOption() is called several times with the same key, the value provided during the last call will be used.

Options can also be passed on the command line of most GDAL utilities with the with '--config KEY VALUE'. For example, ogrinfo --config CPL_DEBUG ON ~/data/test/point.shp

This function can also be used to clear a setting by passing NULL as the value (note: passing NULL will not unset an existing environment variable; it will just unset a value previously set by CPLSetConfigOption()).

see GetConfigOption

http://trac.osgeo.org/gdal/wiki/ConfigOptions

func TermProgress 

func TermProgress(complete float64, message string, data interface{}) int

Types

type Access 

type Access uint

Flag indicating read/write, or read-only access to data.

type AsyncReader 

type AsyncReader struct {
	// contains filtered or unexported fields
}

type AsyncStatusType 

type AsyncStatusType int

status of the asynchronous stream

func GetAsyncStatusTypeByName 

func GetAsyncStatusTypeByName(statusTypeName string) AsyncStatusType

func (AsyncStatusType) Name 

func (statusType AsyncStatusType) Name() string

type ColorEntry 

type ColorEntry struct {
	// contains filtered or unexported fields
}

type ColorInterp 

type ColorInterp int

Types of color interpretation for raster bands.

func GetColorInterpretationByName 

func GetColorInterpretationByName(name string) ColorInterp

func (ColorInterp) Name 

func (colorInterp ColorInterp) Name() string

type ColorTable 

type ColorTable struct {
	// contains filtered or unexported fields
}

func CreateColorTable 

func CreateColorTable(interp PaletteInterp) *ColorTable

Construct a new color table

func (*ColorTable) Clone 

func (ct *ColorTable) Clone() *ColorTable

Make a copy of the color table

func (*ColorTable) CreateColorRamp 

func (ct *ColorTable) CreateColorRamp(start, end int, startColor, endColor *ColorEntry)

Create color ramp

func (*ColorTable) Destroy 

func (ct *ColorTable) Destroy()

Destroy the color table

func (*ColorTable) Entry 

func (ct *ColorTable) Entry(index int) *ColorEntry

Fetch a color entry from table

func (*ColorTable) EntryCount 

func (ct *ColorTable) EntryCount() int

Get number of color entries in table

func (*ColorTable) PaletteInterpretation 

func (ct *ColorTable) PaletteInterpretation() PaletteInterp

Fetch palette interpretation

func (*ColorTable) SetEntry 

func (ct *ColorTable) SetEntry(index int, entry *ColorEntry)

Set entry in color table

type CoordinateTransform 

type CoordinateTransform struct {
	// contains filtered or unexported fields
}

func CreateCoordinateTransform 

func CreateCoordinateTransform(
	source *SpatialReference,
	dest *SpatialReference,
) *CoordinateTransform

Create a new CoordinateTransform

func (*CoordinateTransform) Destroy 

func (ct *CoordinateTransform) Destroy()

Destroy CoordinateTransform

func (*CoordinateTransform) Transform 

func (ct *CoordinateTransform) Transform(numPoints int, xPoints []float64, yPoints []float64, zPoints []float64) bool

type DataSource 

type DataSource struct {
	// contains filtered or unexported fields
}

func OpenDataSource 

func OpenDataSource(name string, update int) *DataSource

Open a file / data source with one of the registered drivers

func OpenDataSourceByIndex 

func OpenDataSourceByIndex(index int) *DataSource

Return the i'th datasource opened

func OpenSharedDataSource 

func OpenSharedDataSource(name string, update int) *DataSource

Open a shared file / data source with one of the registered drivers

func (*DataSource) CopyLayer 

func (ds *DataSource) CopyLayer(
	source Layer,
	name string,
	options []string,
) *Layer

Duplicate an existing layer

func (*DataSource) CreateLayer 

func (ds *DataSource) CreateLayer(
	name string,
	sr SpatialReference,
	geomType GeometryType,
	options []string,
) *Layer

Create a new layer on the data source

func (*DataSource) Delete 

func (ds *DataSource) Delete(index int) error

Delete the layer from the data source

func (*DataSource) Destroy 

func (ds *DataSource) Destroy()

Closes datasource and releases resources

func (*DataSource) Driver 

func (ds *DataSource) Driver() *OGRDriver

Fetch the driver that the data source was opened with

func (*DataSource) ExecuteSQL 

func (ds *DataSource) ExecuteSQL(sql string, filter Geometry, dialect string) *Layer

Execute an SQL statement against the data source

func (*DataSource) LayerByIndex 

func (ds *DataSource) LayerByIndex(index int) *Layer

Fetch a layer of this data source by index

func (*DataSource) LayerByName 

func (ds *DataSource) LayerByName(name string) *Layer

Fetch a layer of this data source by name

func (*DataSource) LayerCount 

func (ds *DataSource) LayerCount() int

Fetch the number of layers in this data source

func (*DataSource) Name 

func (ds *DataSource) Name() string

Fetch the name of the data source

func (*DataSource) Release 

func (ds *DataSource) Release() error

Drop a reference to this datasource and destroy if reference is zero

func (*DataSource) ReleaseResultSet 

func (ds *DataSource) ReleaseResultSet(layer *Layer)

Release the results of ExecuteSQL

func (*DataSource) Sync 

func (ds *DataSource) Sync() error

Flush pending changes to the data source

func (*DataSource) TestCapability 

func (ds *DataSource) TestCapability(capability string) bool

Test if the data source has the indicated capability

type DataType 

type DataType int

Pixel data types

func (DataType) IsComplex 

func (dataType DataType) IsComplex() int

func (DataType) Name 

func (dataType DataType) Name() string

func (DataType) Size 

func (dataType DataType) Size() int

Get data type size in bits.

func (DataType) Union 

func (dataType DataType) Union(dataTypeB DataType) DataType

type Dataset 

type Dataset struct {
	// contains filtered or unexported fields
}

func Open 

func Open(filename string, access Access) (*Dataset, error)

Open an existing dataset

func OpenEx 

func OpenEx(filename string, flags Access, allowedDrivers []string, options []string, siblingFiles []string) (*Dataset, error)

TODO(kyle): deprecate Open(), rename OpenEx->Open

func OpenShared 

func OpenShared(filename string, access Access) *Dataset

Open a shared existing dataset

func (*Dataset) Access 

func (dataset *Dataset) Access() Access

Return access flag

func (*Dataset) AddBand 

func (dataset *Dataset) AddBand(dataType DataType, options []string) error

Add a band to a dataset

func (*Dataset) AdviseRead 

func (dataset *Dataset) AdviseRead(
	rwFlag RWFlag,
	xOff, yOff, xSize, ySize, bufXSize, bufYSize int,
	dataType DataType,
	bandCount int,
	bandMap []int,
	options []string,
) error

Advise driver of upcoming read requests

func (*Dataset) AutoCreateWarpedVRT 

func (dataset *Dataset) AutoCreateWarpedVRT(srcWKT, dstWKT string, resampleAlg ResampleAlg) (*Dataset, error)

func (*Dataset) BuildOverviews 

func (dataset *Dataset) BuildOverviews(
	resampling string,
	nOverviews int,
	overviewList []int,
	nBands int,
	bandList []int,
	progress ProgressFunc,
	data interface{},
) error

Build raster overview(s)

func (*Dataset) Close 

func (dataset *Dataset) Close()

Close the dataset

func (*Dataset) CopyWholeRaster 

func (sourceDataset *Dataset) CopyWholeRaster(
	destDataset *Dataset,
	options []string,
	progress ProgressFunc,
	data interface{},
) error

Copy all dataset raster data

func (*Dataset) CreateMaskBand 

func (dataset *Dataset) CreateMaskBand(flags int) error

Adds a mask band to the dataset

func (*Dataset) Driver 

func (dataset *Dataset) Driver() *Driver

Get the driver to which this dataset relates

func (*Dataset) ExecuteSQL 

func (ds *Dataset) ExecuteSQL(sql string, spatialFilter Geometry, dialect string) (*Layer, error)

ExecuteSQL Executes an SQL statement against the data store.

The result of an SQL query is either NULL for statements that are in error, or that have no results set, or an OGRLayer pointer representing a results set from the query. Note that this OGRLayer is in addition to the layers in the data store and must be destroyed with ReleaseResultSet() before the dataset is closed (destroyed).

This method is the same as the C++ method GDALDataset::ExecuteSQL()

For more information on the SQL dialect supported internally by OGR review the OGR SQL document. Some drivers (i.e. Oracle and PostGIS) pass the SQL directly through to the underlying RDBMS.

func (*Dataset) FileList 

func (dataset *Dataset) FileList() []string

Fetch files forming the dataset.

func (*Dataset) FlushCache 

func (dataset *Dataset) FlushCache()

Write all write cached data to disk

func (*Dataset) GDALDereferenceDataset 

func (dataset *Dataset) GDALDereferenceDataset() int

Subtract one from dataset reference count

func (*Dataset) GDALGetGCPCount 

func (dataset *Dataset) GDALGetGCPCount() int

Get number of GCPs

func (*Dataset) GDALGetInternalHandle 

func (dataset *Dataset) GDALGetInternalHandle(request string) unsafe.Pointer

Fetch a format specific internally meaningful handle

func (*Dataset) GDALReferenceDataset 

func (dataset *Dataset) GDALReferenceDataset() int

Add one to dataset reference count

func (*Dataset) GeoTransform 

func (dataset *Dataset) GeoTransform() [6]float64

Get the affine transformation coefficients

func (*Dataset) IO 

func (dataset *Dataset) IO(
	rwFlag RWFlag,
	xOff, yOff, xSize, ySize int,
	buffer interface{},
	bufXSize, bufYSize int,
	bandCount int,
	bandMap []int,
	pixelSpace, lineSpace, bandSpace int,
) error

Read / write a region of image data from multiple bands

func (*Dataset) InvGeoTransform 

func (dataset *Dataset) InvGeoTransform() [6]float64

Return the inverted transform

func (*Dataset) Layer 

func (ds *Dataset) Layer(layer int) (*Layer, error)

LayerByIndex fetches a layer by index.

The returned layer remains owned by the GDALDataset and should not be deleted by the application.

This function is the same as the C++ method GDALDataset::GetLayer()

func (*Dataset) LayerByName 

func (ds *Dataset) LayerByName(name string) (*Layer, error)

LayerByName fetches a layer by name.

The returned layer remains owned by the GDALDataset and should not be deleted by the application.

This function is the same as the C++ method GDALDataset::GetLayerByName()

func (*Dataset) LayerCount 

func (ds *Dataset) LayerCount() int

LayerCount gets the number of layers in this dataset.

func (*Dataset) Metadata 

func (dataset *Dataset) Metadata(domain string) []string

func (*Dataset) ProjectionRef 

func (dataset *Dataset) ProjectionRef() string

Fetch the projection definition string for this dataset

func (*Dataset) RasterBand 

func (dataset *Dataset) RasterBand(band int) (*RasterBand, error)

RasterBand returns the RasterBand at index band, where:

0 > band >= Dataset.RasterCount()

If the band is invalid, nil and ErrInvalidBand is returned

func (*Dataset) RasterCount 

func (dataset *Dataset) RasterCount() int

Fetch the number of raster bands in the dataset

func (*Dataset) RasterXSize 

func (dataset *Dataset) RasterXSize() int

Fetch X size of raster

func (*Dataset) RasterYSize 

func (dataset *Dataset) RasterYSize() int

Fetch Y size of raster

func (*Dataset) SetGeoTransform 

func (dataset *Dataset) SetGeoTransform(transform [6]float64) error

Set the affine transformation coefficients

func (*Dataset) SetMetadataItem 

func (object *Dataset) SetMetadataItem(name, value, domain string) error

func (*Dataset) SetProjection 

func (dataset *Dataset) SetProjection(proj string) error

Set the projection reference string

type Driver 

type Driver struct {
	// contains filtered or unexported fields
}

func GetDriver 

func GetDriver(index int) (*Driver, error)

Fetch driver by index

func GetDriverByName 

func GetDriverByName(driverName string) (*Driver, error)

Return the driver by short name

func IdentifyDriver 

func IdentifyDriver(filename string, filenameList []string) *Driver

Return the driver needed to access the provided dataset name.

func (*Driver) CopyDatasetFiles 

func (driver *Driver) CopyDatasetFiles(newName, oldName string) error

Copy all files associated with the named dataset

func (*Driver) Create 

func (driver *Driver) Create(
	filename string,
	xSize, ySize, bands int,
	dataType DataType,
	options []string,
) *Dataset

Create a new dataset with this driver.

func (*Driver) CreateCopy 

func (driver *Driver) CreateCopy(
	filename string,
	sourceDataset Dataset,
	strict int,
	options []string,
	progress ProgressFunc,
	data interface{},
) *Dataset

Create a copy of a dataset

func (*Driver) DeleteDataset 

func (driver *Driver) DeleteDataset(name string) error

Delete named dataset

func (*Driver) Deregister 

func (driver *Driver) Deregister()

Deregister the driver

func (*Driver) Destroy 

func (driver *Driver) Destroy()

Destroy a GDAL driver

func (*Driver) LongName 

func (driver *Driver) LongName() string

Get the long name associated with this driver

func (*Driver) MetadataItem 

func (object *Driver) MetadataItem(name, domain string) string

Fetch single metadata item.

func (*Driver) Register 

func (driver *Driver) Register() int

Registers a driver for use

func (*Driver) RenameDataset 

func (driver *Driver) RenameDataset(newName, oldName string) error

Rename named dataset

func (*Driver) ShortName 

func (driver *Driver) ShortName() string

Get the short name associated with this driver

type Envelope 

type Envelope struct {
	// contains filtered or unexported fields
}

func (Envelope) Contains 

func (env Envelope) Contains(other Envelope) bool

Test if one envelope completely contains another

func (Envelope) Intersect 

func (env Envelope) Intersect(other Envelope)

Return the intersection of this envelope with another

func (Envelope) Intersects 

func (env Envelope) Intersects(other Envelope) bool

Test if one envelope intersects another

func (Envelope) IsInit 

func (env Envelope) IsInit() bool

func (Envelope) MaxX 

func (env Envelope) MaxX() float64

func (Envelope) MaxY 

func (env Envelope) MaxY() float64

func (Envelope) MinX 

func (env Envelope) MinX() float64

func (Envelope) MinY 

func (env Envelope) MinY() float64

func (*Envelope) SetMaxX 

func (env *Envelope) SetMaxX(val float64)

func (*Envelope) SetMaxY 

func (env *Envelope) SetMaxY(val float64)

func (*Envelope) SetMinX 

func (env *Envelope) SetMinX(val float64)

func (*Envelope) SetMinY 

func (env *Envelope) SetMinY(val float64)

func (Envelope) Union 

func (env Envelope) Union(other Envelope) Envelope

Return the union of this envelope with another one

type Feature 

type Feature struct {
	// contains filtered or unexported fields
}

func (*Feature) Clone 

func (feature *Feature) Clone() *Feature

Duplicate feature

func (*Feature) Definition 

func (feature *Feature) Definition() *FeatureDefinition

Fetch feature definition

func (Feature) Destroy 

func (feature Feature) Destroy()

Destroy this feature

func (*Feature) Equal 

func (f1 *Feature) Equal(f2 *Feature) bool

Test if two features are the same

func (*Feature) FID 

func (feature *Feature) FID() int

Fetch feature indentifier

func (*Feature) FieldAsBinary 

func (feature *Feature) FieldAsBinary(index int) []uint8

Fetch field as binary data

func (*Feature) FieldAsDateTime 

func (feature *Feature) FieldAsDateTime(index int) (time.Time, bool)

Fetch field as date and time

func (*Feature) FieldAsFloat64 

func (feature *Feature) FieldAsFloat64(index int) float64

Fetch field value as float64

func (*Feature) FieldAsFloat64List 

func (feature *Feature) FieldAsFloat64List(index int) []float64

Fetch field as list of float64

func (*Feature) FieldAsInteger 

func (feature *Feature) FieldAsInteger(index int) int

Fetch field value as integer

func (*Feature) FieldAsIntegerList 

func (feature *Feature) FieldAsIntegerList(index int) []int

Fetch field as list of integers

func (*Feature) FieldAsString 

func (feature *Feature) FieldAsString(index int) string

Fetch field value as string

func (*Feature) FieldAsStringList 

func (feature *Feature) FieldAsStringList(index int) []string

Fetch field as list of strings

func (*Feature) FieldCount 

func (feature *Feature) FieldCount() int

Fetch number of fields on this feature

func (*Feature) FieldDefinition 

func (feature *Feature) FieldDefinition(index int) *FieldDefinition

Fetch definition for the indicated field

func (*Feature) FieldIndex 

func (feature *Feature) FieldIndex(name string) int

Fetch the field index for the given field name

func (*Feature) Geometry 

func (feature *Feature) Geometry() *Geometry

Fetch geometry of this feature

func (Feature) IsFieldSet 

func (feature Feature) IsFieldSet(index int) bool

Return if a field has ever been assigned a value

func (*Feature) RawField 

func (feature *Feature) RawField(index int) *Field

Fetch a reference to the internal field value

func (*Feature) SetFID 

func (feature *Feature) SetFID(fid int) error

Set feature identifier

func (*Feature) SetFieldBinary 

func (feature *Feature) SetFieldBinary(index int, value []uint8)

Set field as binary data

func (*Feature) SetFieldDateTime 

func (feature *Feature) SetFieldDateTime(index int, dt time.Time)

Set field as date / time

func (*Feature) SetFieldFloat64 

func (feature *Feature) SetFieldFloat64(index int, value float64)

Set field to float64 value

func (*Feature) SetFieldFloat64List 

func (feature *Feature) SetFieldFloat64List(index int, value []float64)

Set field to list of float64

func (*Feature) SetFieldInteger 

func (feature *Feature) SetFieldInteger(index, value int)

Set field to integer value

func (*Feature) SetFieldIntegerList 

func (feature *Feature) SetFieldIntegerList(index int, value []int)

Set field to list of integers

func (*Feature) SetFieldRaw 

func (feature *Feature) SetFieldRaw(index int, field Field)

Set field from the raw field pointer

func (*Feature) SetFieldString 

func (feature *Feature) SetFieldString(index int, value string)

Set field to string value

func (*Feature) SetFieldStringList 

func (feature *Feature) SetFieldStringList(index int, value []string)

Set field to list of strings

func (*Feature) SetFrom 

func (this *Feature) SetFrom(other *Feature, forgiving int) error

Set one feature from another

func (*Feature) SetFromWithMap 

func (this *Feature) SetFromWithMap(other *Feature, forgiving int, fieldMap []int) error

Set one feature from another, using field map

func (Feature) SetGeometry 

func (feature Feature) SetGeometry(geom Geometry) error

Set feature geometry

func (Feature) SetGeometryDirectly 

func (feature Feature) SetGeometryDirectly(geom Geometry) error

Set feature geometry, passing ownership to the feature

func (*Feature) SetStyleString 

func (feature *Feature) SetStyleString(style string)

Set style string for this feature

func (*Feature) StealGeometry 

func (feature *Feature) StealGeometry() *Geometry

Fetch geometry of this feature and assume ownership

func (*Feature) StlyeString 

func (feature *Feature) StlyeString() string

Fetch style string for this feature

func (*Feature) UnsetField 

func (feature *Feature) UnsetField(index int)

Clear a field and mark it as unset

type FeatureDefinition 

type FeatureDefinition struct {
	// contains filtered or unexported fields
}

func CreateFeatureDefinition 

func CreateFeatureDefinition(name string) *FeatureDefinition

Create a new feature definition object

func (*FeatureDefinition) AddFieldDefinition 

func (fd *FeatureDefinition) AddFieldDefinition(fieldDefn *FieldDefinition)

Add a new field definition to this feature definition

func (*FeatureDefinition) Create 

func (fd *FeatureDefinition) Create() *Feature

Create a feature from this feature definition

func (*FeatureDefinition) DeleteFieldDefinition 

func (fd *FeatureDefinition) DeleteFieldDefinition(index int) error

Delete a field definition from this feature definition

func (*FeatureDefinition) Dereference 

func (fd *FeatureDefinition) Dereference() int

Decrement the reference count by one

func (*FeatureDefinition) Destroy 

func (fd *FeatureDefinition) Destroy()

Destroy a feature definition object

func (*FeatureDefinition) FieldCount 

func (fd *FeatureDefinition) FieldCount() int

Fetch the number of fields in the feature definition

func (*FeatureDefinition) FieldDefinition 

func (fd *FeatureDefinition) FieldDefinition(index int) *FieldDefinition

Fetch the definition of the indicated field

func (*FeatureDefinition) FieldIndex 

func (fd *FeatureDefinition) FieldIndex(name string) int

Fetch the index of the named field

func (*FeatureDefinition) GeometryType 

func (fd *FeatureDefinition) GeometryType() GeometryType

Fetch the geometry base type of this feature definition

func (*FeatureDefinition) IsGeometryIgnored 

func (fd *FeatureDefinition) IsGeometryIgnored() bool

Fetch if the geometry can be ignored when fetching features

func (*FeatureDefinition) IsStyleIgnored 

func (fd *FeatureDefinition) IsStyleIgnored() bool

Fetch if the style can be ignored when fetching features

func (*FeatureDefinition) Name 

func (fd *FeatureDefinition) Name() string

Fetch the name of this feature definition

func (*FeatureDefinition) Reference 

func (fd *FeatureDefinition) Reference() int

Increment the reference count by one

func (*FeatureDefinition) ReferenceCount 

func (fd *FeatureDefinition) ReferenceCount() int

Fetch the current reference count

func (*FeatureDefinition) Release 

func (fd *FeatureDefinition) Release()

Drop a reference, and delete object if no references remain

func (*FeatureDefinition) SetGeometryIgnored 

func (fd *FeatureDefinition) SetGeometryIgnored(val bool)

Set whether the geometry can be ignored when fetching features

func (*FeatureDefinition) SetGeometryType 

func (fd *FeatureDefinition) SetGeometryType(geomType GeometryType)

Set the geometry base type for this feature definition

func (*FeatureDefinition) SetStyleIgnored 

func (fd *FeatureDefinition) SetStyleIgnored(val bool)

Set whether the style can be ignored when fetching features

type Field 

type Field struct {
	// contains filtered or unexported fields
}

type FieldDefinition 

type FieldDefinition struct {
	// contains filtered or unexported fields
}

func CreateFieldDefinition 

func CreateFieldDefinition(name string, fieldType FieldType) *FieldDefinition

Create a new field definition

func (*FieldDefinition) Destroy 

func (fd *FieldDefinition) Destroy()

Destroy the field definition

func (*FieldDefinition) IsIgnored 

func (fd *FieldDefinition) IsIgnored() bool

Fetch whether this field should be ignored when fetching features

func (*FieldDefinition) Justification 

func (fd *FieldDefinition) Justification() Justification

Fetch the justification for this field

func (*FieldDefinition) Name 

func (fd *FieldDefinition) Name() string

Fetch the name of the field

func (*FieldDefinition) Precision 

func (fd *FieldDefinition) Precision() int

Fetch the precision for this field

func (*FieldDefinition) Set 

func (fd *FieldDefinition) Set(
	name string,
	fType FieldType,
	width, precision int,
	justify Justification,
)

Set defining parameters of field in a single call

func (*FieldDefinition) SetIgnored 

func (fd *FieldDefinition) SetIgnored(ignore bool)

Set whether this field should be ignored when fetching features

func (*FieldDefinition) SetJustification 

func (fd *FieldDefinition) SetJustification(justify Justification)

Set the justification for this field

func (*FieldDefinition) SetName 

func (fd *FieldDefinition) SetName(name string)

Set the name of the field

func (*FieldDefinition) SetPrecision 

func (fd *FieldDefinition) SetPrecision(precision int)

Set the precision for this field

func (*FieldDefinition) SetType 

func (fd *FieldDefinition) SetType(fType FieldType)

Set the type of this field

func (*FieldDefinition) SetWidth 

func (fd *FieldDefinition) SetWidth(width int)

Set the formatting width for this field

func (*FieldDefinition) Type 

func (fd *FieldDefinition) Type() FieldType

Fetch the type of this field

func (*FieldDefinition) Width 

func (fd *FieldDefinition) Width() int

Fetch the formatting width for this field

type FieldType 

type FieldType int

List of well known binary geometry types

func (FieldType) Name 

func (ft FieldType) Name() string

Fetch human readable name for the field type

type Geometry 

type Geometry struct {
	// contains filtered or unexported fields
}

func ApproximateArcAngles 

func ApproximateArcAngles(
	x, y, z,
	primaryRadius,
	secondaryRadius,
	rotation,
	startAngle,
	endAngle,
	stepSizeDegrees float64,
) *Geometry

Stroke arc to linestring

func Create 

func Create(geomType GeometryType) *Geometry

Create an empty geometry of the desired type

func CreateFromGML 

func CreateFromGML(gml string) *Geometry

Create a geometry from its GML representation

func CreateFromJson 

func CreateFromJson(_json string) *Geometry

Create a geometry object from its GeoJSON representation

func CreateFromWKB 

func CreateFromWKB(wkb []uint8, srs *SpatialReference, bytes int) (*Geometry, error)

Create a geometry object from its well known binary representation

func CreateFromWKT 

func CreateFromWKT(wkt string, srs SpatialReference) (*Geometry, error)

Create a geometry object from its well known text representation

func (*Geometry) AddGeometry 

func (geom *Geometry) AddGeometry(other *Geometry) error

Add a geometry to a geometry container

func (*Geometry) AddGeometryDirectly 

func (geom *Geometry) AddGeometryDirectly(other *Geometry) error

Add a geometry to a geometry container and assign ownership to that container

func (*Geometry) AddPoint 

func (geom *Geometry) AddPoint(x, y, z float64)

Add a new point to the geometry (line string or polygon only)

func (*Geometry) AddPoint2D 

func (geom *Geometry) AddPoint2D(x, y float64)

Add a new point to the geometry (line string or polygon only), ignoring the 3rd dimension

func (*Geometry) Area 

func (geom *Geometry) Area() float64

Compute area of geometry

func (*Geometry) Boundary 

func (geom *Geometry) Boundary() *Geometry

Compute boundary for the geometry

func (*Geometry) Buffer 

func (geom *Geometry) Buffer(distance float64, segments int) *Geometry

Compute buffer of the geometry

func (Geometry) BuildPolygonFromEdges 

func (geom Geometry) BuildPolygonFromEdges(autoClose bool, tolerance float64) (Geometry, error)

Build a polygon / ring from a set of lines

func (*Geometry) Centroid 

func (geom *Geometry) Centroid() *Geometry

Compute centroid of geometry

func (*Geometry) Clone 

func (geom *Geometry) Clone() *Geometry

Create a copy of this geometry

func (*Geometry) CloseRings 

func (geom *Geometry) CloseRings()

Force rings to be closed

func (*Geometry) Contains 

func (geom *Geometry) Contains(other *Geometry) bool

Return true if this geometry contains the other

func (*Geometry) ConvexHull 

func (geom *Geometry) ConvexHull() *Geometry

Compute convex hull for the geometry

func (*Geometry) CoordinateDimension 

func (geom *Geometry) CoordinateDimension() int

Get the dimension of the coordinates in this geometry

func (*Geometry) Crosses 

func (geom *Geometry) Crosses(other *Geometry) bool

Return true if this feature crosses the other

func (*Geometry) Destroy 

func (geometry *Geometry) Destroy()

Destroy geometry object

func (*Geometry) Difference 

func (geom *Geometry) Difference(other *Geometry) *Geometry

Compute difference between this geometry and the other

func (*Geometry) Dimension 

func (geom *Geometry) Dimension() int

Get the dimension of this geometry

func (*Geometry) Disjoint 

func (geom *Geometry) Disjoint(other *Geometry) bool

Return true if the features are disjoint

func (*Geometry) Distance 

func (geom *Geometry) Distance(other *Geometry) float64

Compute distance between thie geometry and the other

func (*Geometry) Empty 

func (geom *Geometry) Empty()

Clear the geometry to its uninitialized state

func (*Geometry) Envelope 

func (geom *Geometry) Envelope() Envelope

Compute and return the bounding envelope for this geometry

func (*Geometry) Equals 

func (geom *Geometry) Equals(other *Geometry) bool

Return true if these features are equal

func (*Geometry) FlattenTo2D 

func (geom *Geometry) FlattenTo2D()

Convert geometry to strictly 2D

func (*Geometry) ForceToMultiLineString 

func (geom *Geometry) ForceToMultiLineString() *Geometry

Convert to multilinestring

func (*Geometry) ForceToMultiPoint 

func (geom *Geometry) ForceToMultiPoint() *Geometry

Convert to multipoint

func (*Geometry) ForceToMultiPolygon 

func (geom *Geometry) ForceToMultiPolygon() *Geometry

Convert to multipolygon

func (*Geometry) ForceToPolygon 

func (geom *Geometry) ForceToPolygon() *Geometry

Convert to polygon

func (*Geometry) FromWKB 

func (geom *Geometry) FromWKB(wkb []uint8, bytes int) error

Assign a geometry from well known binary data

func (*Geometry) FromWKT 

func (geom *Geometry) FromWKT(wkt string) error

Assign geometry object from its well known text representation

func (*Geometry) Geometry 

func (geom *Geometry) Geometry(index int) *Geometry

Fetch geometry from a geometry container

func (*Geometry) GeometryCount 

func (geom *Geometry) GeometryCount() int

Fetch the number of elements in the geometry, or number of geometries in the container

func (*Geometry) Intersection 

func (geom *Geometry) Intersection(other *Geometry) *Geometry

Compute intersection of this geometry with the other

func (*Geometry) Intersects 

func (geom *Geometry) Intersects(other *Geometry) bool

Return true if these features intersect

func (*Geometry) IsEmpty 

func (geom *Geometry) IsEmpty() bool

Test if the geometry is empty

func (*Geometry) IsRing 

func (geom *Geometry) IsRing() bool

Test if the geometry is a ring

func (*Geometry) IsSimple 

func (geom *Geometry) IsSimple() bool

Test if the geometry is simple

func (*Geometry) IsValid 

func (geom *Geometry) IsValid() bool

Test if the geometry is valid

func (*Geometry) Length 

func (geom *Geometry) Length() float64

Compute length of geometry

func (*Geometry) Name 

func (geom *Geometry) Name() string

Fetch geometry name

func (*Geometry) Overlaps 

func (geom *Geometry) Overlaps(other *Geometry) bool

Return true if this geometry overlaps the other

func (*Geometry) Point 

func (geom *Geometry) Point(index int) (x, y, z float64)

Fetch the coordinates of a point in the geometry

func (*Geometry) PointCount 

func (geom *Geometry) PointCount() int

Fetch number of points in the geometry

func (*Geometry) Polygonize 

func (geom *Geometry) Polygonize() *Geometry

Polygonize a set of sparse edges

func (Geometry) RemoveGeometry 

func (geom Geometry) RemoveGeometry(index int, delete bool) error

Remove a geometry from the geometry container

func (*Geometry) Segmentize 

func (geom *Geometry) Segmentize(distance float64)

Modify the geometry such that it has no line segment longer than the given distance

func (*Geometry) SetCoordinateDimension 

func (geom *Geometry) SetCoordinateDimension(dim int)

Set the dimension of the coordinates in this geometry

func (*Geometry) SetPoint 

func (geom *Geometry) SetPoint(index int, x, y, z float64)

Set the coordinates of a point in the geometry

func (*Geometry) SetPoint2D 

func (geom *Geometry) SetPoint2D(index int, x, y float64)

Set the coordinates of a point in the geometry, ignoring the 3rd dimension

func (*Geometry) SetSpatialReference 

func (geom *Geometry) SetSpatialReference(spatialRef *SpatialReference)

Assign a spatial reference to this geometry

func (*Geometry) Simplify 

func (geom *Geometry) Simplify(tolerance float64) *Geometry

Simplify the geometry

func (*Geometry) SimplifyPreservingTopology 

func (geom *Geometry) SimplifyPreservingTopology(tolerance float64) *Geometry

Simplify the geometry while preserving topology

func (*Geometry) SpatialReference 

func (geom *Geometry) SpatialReference() *SpatialReference

Fetch the spatial reference associated with this geometry

func (*Geometry) SymmetricDifference 

func (geom *Geometry) SymmetricDifference(other *Geometry) *Geometry

Compute symmetric difference between this geometry and the other

func (*Geometry) ToGML 

func (geom *Geometry) ToGML() string

Convert a geometry to GML format

func (*Geometry) ToGML_Ex 

func (geom *Geometry) ToGML_Ex(options []string) string

Convert a geometry to GML format with options

func (*Geometry) ToJSON 

func (geom *Geometry) ToJSON() string

Convert a geometry to JSON format

func (*Geometry) ToJSON_ex 

func (geom *Geometry) ToJSON_ex(options []string) string

Convert a geometry to JSON format with options

func (*Geometry) ToKML 

func (geom *Geometry) ToKML() string

Convert a geometry to KML format

func (*Geometry) ToWKB 

func (geom *Geometry) ToWKB() ([]uint8, error)

Convert a geometry to well known binary data

func (*Geometry) ToWKT 

func (geom *Geometry) ToWKT() (string, error)

Fetch geometry as WKT

func (*Geometry) Touches 

func (geom *Geometry) Touches(other *Geometry) bool

Return true if this feature touches the other

func (*Geometry) Transform 

func (geom *Geometry) Transform(ct *CoordinateTransform) error

Apply coordinate transformation to geometry

func (*Geometry) TransformTo 

func (geom *Geometry) TransformTo(sr *SpatialReference) error

Transform geometry to new spatial reference system

func (*Geometry) Type 

func (geom *Geometry) Type() GeometryType

Fetch geometry type

func (*Geometry) Union 

func (geom *Geometry) Union(other *Geometry) *Geometry

Compute union of this geometry with the other

func (*Geometry) WKBSize 

func (geom *Geometry) WKBSize() int

Returns size of related binary representation

func (*Geometry) Within 

func (geom *Geometry) Within(other *Geometry) bool

Return true if this geometry is within the other

func (*Geometry) X 

func (geom *Geometry) X(index int) float64

Fetch the X coordinate of a point in the geometry

func (*Geometry) Y 

func (geom *Geometry) Y(index int) float64

Fetch the Y coordinate of a point in the geometry

func (*Geometry) Z 

func (geom *Geometry) Z(index int) float64

Fetch the Z coordinate of a point in the geometry

type GeometryType 

type GeometryType uint32

List of well known binary geometry types

type GridAlgorithm 

type GridAlgorithm uint8

TODO(kyle): this is not right

type GridOptions 

type GridOptions struct {
	Power           float64
	Smoothing       float64
	AnisotropyRatio float64
	AnisotropyAngle float64
	Radius1         float64
	Radius2         float64
	Angle           float64
	MaxPoints       uint32
	MinPoints       uint32
	NoDataValue     float64
}

type Justification 

type Justification int

type Layer 

type Layer struct {
	// contains filtered or unexported fields
}

func (*Layer) AlterFieldDefn 

func (layer *Layer) AlterFieldDefn(index int, newDefn FieldDefinition, flags int) error

Alter the definition of an existing field of a layer

func (*Layer) CommitTransaction 

func (layer *Layer) CommitTransaction() error

Commit a transaction on data sources which support it

func (*Layer) CreateFeature 

func (layer *Layer) CreateFeature(feature *Feature) error

Create and write a new feature within a layer

func (*Layer) CreateField 

func (layer *Layer) CreateField(fd *FieldDefinition, approxOK bool) error

Create a new field on a layer

func (*Layer) Definition 

func (layer *Layer) Definition() *FeatureDefinition

Fetch the schema information for this layer

func (*Layer) DeleteFeature 

func (layer *Layer) DeleteFeature(index int) error

Delete indicated feature from layer

func (*Layer) DeleteField 

func (layer *Layer) DeleteField(index int) error

Delete a field from the layer

func (*Layer) Extent 

func (layer *Layer) Extent(force bool) (env Envelope, err error)

Fetch the extent of this layer

func (*Layer) FIDColumn 

func (layer *Layer) FIDColumn() string

Fetch the name of the FID column

func (*Layer) Feature 

func (layer *Layer) Feature(index int) *Feature

Fetch a feature by its index

func (*Layer) FeatureCount 

func (layer *Layer) FeatureCount(force bool) (count int, ok bool)

Fetch the feature count for this layer

func (*Layer) GeomType 

func (layer *Layer) GeomType() GeometryType

Return the layer geometry type

func (*Layer) GeometryColumn 

func (layer *Layer) GeometryColumn() string

Fetch the name of the geometry column

func (*Layer) Name 

func (layer *Layer) Name() string

Return the layer name

func (*Layer) NextFeature 

func (layer *Layer) NextFeature() *Feature

Fetch the next available feature from this layer

func (*Layer) ReorderField 

func (layer *Layer) ReorderField(oldIndex, newIndex int) error

Reorder an existing field of a layer

func (*Layer) ReorderFields 

func (layer *Layer) ReorderFields(layerMap []int) error

Reorder all the fields of a layer

func (*Layer) ResetReading 

func (layer *Layer) ResetReading()

Reset reading to start on the first feature

func (*Layer) RollbackTransaction 

func (layer *Layer) RollbackTransaction() error

Roll back the current transaction on data sources which support it

func (*Layer) SetAttributeFilter 

func (layer *Layer) SetAttributeFilter(filter string) error

Set a new attribute query filter

func (*Layer) SetFeature 

func (layer *Layer) SetFeature(feature *Feature) error

Rewrite the provided feature

func (*Layer) SetIgnoredFields 

func (layer *Layer) SetIgnoredFields(names []string) error

Set which fields can be ignored when retrieving features from the layer

func (*Layer) SetNextByIndex 

func (layer *Layer) SetNextByIndex(index int) error

Move read cursor to the provided index

func (*Layer) SetSpatialFilter 

func (layer *Layer) SetSpatialFilter(filter *Geometry)

Set a new spatial filter for this layer

func (*Layer) SetSpatialFilterRect 

func (layer *Layer) SetSpatialFilterRect(minX, minY, maxX, maxY float64)

Set a new rectangular spatial filter for this layer

func (*Layer) SpatialFilter 

func (layer *Layer) SpatialFilter() *Geometry

Return the current spatial filter for this layer

func (*Layer) SpatialRef 

func (layer *Layer) SpatialRef() *SpatialReference

Fetch the spatial reference system for this layer

func (*Layer) StartTransaction 

func (layer *Layer) StartTransaction() error

Begin a transation on data sources which support it

func (*Layer) Sync 

func (layer *Layer) Sync() error

Flush pending changes to the layer

func (*Layer) TestCapability 

func (layer *Layer) TestCapability(capability string) bool

Test if this layer supports the named capability

type MajorObject 

type MajorObject struct {
	// contains filtered or unexported fields
}

func (MajorObject) Description 

func (object MajorObject) Description() string

Fetch object description

func (MajorObject) Metadata 

func (object MajorObject) Metadata(domain string) []string

Fetch metadata

func (MajorObject) MetadataItem 

func (object MajorObject) MetadataItem(name, domain string) string

Fetch a single metadata item

func (MajorObject) SetDescription 

func (object MajorObject) SetDescription(desc string)

Set object description

func (MajorObject) SetMetadata 

func (object MajorObject) SetMetadata(metadata []string, domain string)

Set metadata

func (MajorObject) SetMetadataItem 

func (object MajorObject) SetMetadataItem(name, value, domain string)

Set a single metadata item

type OGRDriver 

type OGRDriver struct {
	// contains filtered or unexported fields
}

func OGRDriverByIndex 

func OGRDriverByIndex(index int) *OGRDriver

Fetch the indicated driver by index

func OGRDriverByName 

func OGRDriverByName(name string) *OGRDriver

Fetch the indicated driver by name

func (*OGRDriver) Copy 

func (driver *OGRDriver) Copy(source DataSource, name string, options []string) (newDS *DataSource, ok bool)

Create a new datasource with this driver by copying all layers of the existing datasource

func (*OGRDriver) Create 

func (driver *OGRDriver) Create(name string, options []string) (newDS *DataSource, ok bool)

Create a new data source based on this driver

func (*OGRDriver) Delete 

func (driver *OGRDriver) Delete(filename string) error

Delete a data source

func (*OGRDriver) Deregister 

func (driver *OGRDriver) Deregister()

Remove a driver from the list of registered drivers

func (*OGRDriver) Name 

func (driver *OGRDriver) Name() string

Fetch name of driver (file format)

func (*OGRDriver) Open 

func (driver *OGRDriver) Open(filename string, update int) (newDS *DataSource, ok bool)

Attempt to open file with this driver

func (*OGRDriver) Register 

func (driver *OGRDriver) Register()

Add a driver to the list of registered drivers

func (*OGRDriver) TestCapability 

func (driver *OGRDriver) TestCapability(capability string) bool

Test if this driver supports the named capability

type PaletteInterp 

type PaletteInterp int

Types of color interpretations for a GDALColorTable.

func (PaletteInterp) Name 

func (paletteInterp PaletteInterp) Name() string

type ProgressFunc 

type ProgressFunc func(complete float64, message string, progressArg interface{}) int

type RATFieldType 

type RATFieldType int

type RATFieldUsage 

type RATFieldUsage int

type RWFlag 

type RWFlag int

Read/Write flag for RasterIO() method

type RasterAttributeTable 

type RasterAttributeTable struct {
	// contains filtered or unexported fields
}

func CreateRasterAttributeTable 

func CreateRasterAttributeTable() *RasterAttributeTable

Construct empty raster attribute table

func (*RasterAttributeTable) ColOfUsage 

func (rat *RasterAttributeTable) ColOfUsage(rfu RATFieldUsage) int

Fetch column index for indicated usage

func (*RasterAttributeTable) ColumnCount 

func (rat *RasterAttributeTable) ColumnCount() int

Fetch table column count

func (*RasterAttributeTable) CreateColumn 

func (rat *RasterAttributeTable) CreateColumn(name string, rft RATFieldType, rfu RATFieldUsage) error

Create new column

func (*RasterAttributeTable) Destroy 

func (rat *RasterAttributeTable) Destroy()

Destroy a RAT

func (*RasterAttributeTable) FromColorTable 

func (rat *RasterAttributeTable) FromColorTable(ct ColorTable) error

Initialize RAT from color table

func (*RasterAttributeTable) LinearBinning 

func (rat *RasterAttributeTable) LinearBinning() (row0min, binsize float64, exists bool)

Fetch linear binning information

func (*RasterAttributeTable) NameOfCol 

func (rat *RasterAttributeTable) NameOfCol(index int) string

Fetch the name of indicated column

func (*RasterAttributeTable) RowCount 

func (rat *RasterAttributeTable) RowCount() int

Fetch row count

func (*RasterAttributeTable) RowOfValue 

func (rat *RasterAttributeTable) RowOfValue(val float64) (int, bool)

Get row for pixel value

func (*RasterAttributeTable) SetLinearBinning 

func (rat *RasterAttributeTable) SetLinearBinning(row0min, binsize float64) error

Set linear binning information

func (*RasterAttributeTable) SetRowCount 

func (rat *RasterAttributeTable) SetRowCount(count int)

Set row count

func (*RasterAttributeTable) SetValueAsFloat64 

func (rat *RasterAttributeTable) SetValueAsFloat64(row, field int, val float64)

Set field value from float64

func (*RasterAttributeTable) SetValueAsInt 

func (rat *RasterAttributeTable) SetValueAsInt(row, field, val int)

Set field value from integer

func (*RasterAttributeTable) SetValueAsString 

func (rat *RasterAttributeTable) SetValueAsString(row, field int, val string)

Set field value from string

func (*RasterAttributeTable) ToColorTable 

func (rat *RasterAttributeTable) ToColorTable(count int) ColorTable

Translate RAT to a color table

func (*RasterAttributeTable) TypeOfCol 

func (rat *RasterAttributeTable) TypeOfCol(index int) RATFieldType

Fetch the type of indicated column

func (*RasterAttributeTable) UsageOfCol 

func (rat *RasterAttributeTable) UsageOfCol(index int) RATFieldUsage

Fetch the usage of indicated column

func (*RasterAttributeTable) ValueAsFloat64 

func (rat *RasterAttributeTable) ValueAsFloat64(row, field int) float64

Fetch field value as float64

func (*RasterAttributeTable) ValueAsInt 

func (rat *RasterAttributeTable) ValueAsInt(row, field int) int

Fetch field value as integer

func (*RasterAttributeTable) ValueAsString 

func (rat *RasterAttributeTable) ValueAsString(row, field int) string

Fetch field value as string

type RasterBand 

type RasterBand struct {
	// contains filtered or unexported fields
}

func (*RasterBand) AdviseRead 

func (band *RasterBand) AdviseRead(
	xOff, yOff, xSize, ySize, bufXSize, bufYSize int,
	dataType DataType,
	options []string,
) error

Advise driver of upcoming read requests

func (*RasterBand) Band 

func (band *RasterBand) Band() int

Fetch the band number of this raster band

func (*RasterBand) BlockSize 

func (band *RasterBand) BlockSize() (int, int)

Fetch the "natural" block size of this band

func (*RasterBand) CategoryNames 

func (band *RasterBand) CategoryNames() []string

Fetch the list of category names for this raster

func (*RasterBand) Checksum 

func (rb *RasterBand) Checksum(xOff, yOff, xSize, ySize int) int

Compute checksum for image region

func (*RasterBand) ColorInterp 

func (band *RasterBand) ColorInterp() ColorInterp

How should this band be interpreted as color?

func (*RasterBand) ColorTable 

func (band *RasterBand) ColorTable() *ColorTable

Fetch the color table associated with this raster band

func (*RasterBand) ComputeMinMax 

func (band *RasterBand) ComputeMinMax(approxOK int) (min, max float64)

Compute the min / max values for a band

func (*RasterBand) ComputeProximity 

func (src *RasterBand) ComputeProximity(
	dest *RasterBand,
	options []string,
	progress ProgressFunc,
	data interface{},
) error

Compute the proximity of all pixels in the image to a set of pixels in the source image

func (*RasterBand) ComputeStatistics 

func (band *RasterBand) ComputeStatistics(
	approxOK int,
	progress ProgressFunc,
	data interface{},
) (min, max, mean, stdDev float64)

Compute image statistics

func (*RasterBand) CreateMaskBand 

func (band *RasterBand) CreateMaskBand(flags int) error

Adds a mask band to the current band

func (*RasterBand) DefaultHistogram 

func (rb *RasterBand) DefaultHistogram(
	force int,
	progress ProgressFunc,
	data interface{},
) (min, max float64, buckets int, histogram []uint64, err error)

Fetch default raster histogram

func (*RasterBand) FPolygonize 

func (src *RasterBand) FPolygonize(
	mask *RasterBand,
	layer *Layer,
	fieldIndex int,
	options []string,
	progress ProgressFunc,
	data interface{},
) error

Create polygon coverage from raster data using a floating point buffer

func (*RasterBand) Fill 

func (band *RasterBand) Fill(real, imaginary float64) error

Fill this band with a constant value

func (*RasterBand) FillNoData 

func (src *RasterBand) FillNoData(
	mask *RasterBand,
	distance float64,
	iterations int,
	options []string,
	progress ProgressFunc,
	data interface{},
) error

Fill selected raster regions by interpolation from the edges

func (*RasterBand) FlushCache 

func (band *RasterBand) FlushCache()

Flush raster data cache

func (*RasterBand) GetAccess 

func (band *RasterBand) GetAccess() Access

Find out if we have update permission for this band

func (*RasterBand) GetDataset 

func (band *RasterBand) GetDataset() *Dataset

Fetch the owning dataset handle

func (*RasterBand) GetDefaultRAT 

func (band *RasterBand) GetDefaultRAT() RasterAttributeTable

Fetch default Raster Attribute Table

func (*RasterBand) GetMaskBand 

func (band *RasterBand) GetMaskBand() *RasterBand

Return the mask band associated with the band

func (*RasterBand) GetMaskFlags 

func (band *RasterBand) GetMaskFlags() int

Return the status flags of the mask band associated with the band

func (*RasterBand) GetMaximum 

func (band *RasterBand) GetMaximum() (val float64, valid bool)

Fetch the maximum value for this band

func (*RasterBand) GetMinimum 

func (band *RasterBand) GetMinimum() (val float64, valid bool)

Fetch the minimum value for this band

func (*RasterBand) GetOffset 

func (band *RasterBand) GetOffset() (float64, bool)

Fetch the raster value offset

func (*RasterBand) GetScale 

func (band *RasterBand) GetScale() (float64, bool)

Fetch the raster value scale

func (*RasterBand) GetStatistics 

func (band *RasterBand) GetStatistics(approxOK, force int) (min, max, mean, stdDev float64)

Fetch image statistics

func (*RasterBand) GetUnitType 

func (band *RasterBand) GetUnitType() string

Return raster unit type

func (*RasterBand) HasArbitraryOverviews 

func (band *RasterBand) HasArbitraryOverviews() int

Check for arbitrary overviews

func (*RasterBand) Histogram 

func (rb *RasterBand) Histogram(
	min, max float64,
	buckets int,
	includeOutOfRange, approxOK int,
	progress ProgressFunc,
	data interface{},
) ([]uint64, error)

Compute raster histogram

func (*RasterBand) IO 

func (band *RasterBand) IO(
	rwFlag RWFlag,
	xOff, yOff, xSize, ySize int,
	buffer interface{},
	bufXSize, bufYSize int,
	pixelSpace, lineSpace int,
) error

Read / Write a region of image data for this band

func (*RasterBand) Metadata 

func (band *RasterBand) Metadata(domain string) []string

func (*RasterBand) MetadataItem 

func (band *RasterBand) MetadataItem(name, domain string) string

func (*RasterBand) NoDataValue 

func (band *RasterBand) NoDataValue() (val float64, valid bool)

Fetch the no data value for this band

func (*RasterBand) Overview 

func (band *RasterBand) Overview(level int) *RasterBand

Fetch overview raster band object

func (*RasterBand) OverviewCount 

func (band *RasterBand) OverviewCount() int

Return the number of overview layers available

func (*RasterBand) Polygonize 

func (src *RasterBand) Polygonize(
	mask *RasterBand,
	layer *Layer,
	fieldIndex int,
	options []string,
	progress ProgressFunc,
	data interface{},
) error

Create polygon coverage from raster data using an integer buffer

func (*RasterBand) RasterBandCopyWholeRaster 

func (sourceRaster *RasterBand) RasterBandCopyWholeRaster(
	destRaster *RasterBand,
	options []string,
	progress ProgressFunc,
	data interface{},
) error

Copy all raster band raster data

func (*RasterBand) RasterDataType 

func (band *RasterBand) RasterDataType() DataType

Fetch the pixel data type for this band

func (*RasterBand) ReadBlock 

func (band *RasterBand) ReadBlock(xOff, yOff int, dataPtr unsafe.Pointer) error

Read a block of image data efficiently

func (*RasterBand) SetColorInterp 

func (band *RasterBand) SetColorInterp(colorInterp ColorInterp) error

Set color interpretation of the raster band

func (*RasterBand) SetColorTable 

func (band *RasterBand) SetColorTable(colorTable ColorTable) error

Set the raster color table for this raster band

func (*RasterBand) SetDefaultRAT 

func (band *RasterBand) SetDefaultRAT(rat RasterAttributeTable) error

Set default Raster Attribute Table

func (*RasterBand) SetMetadataItem 

func (object *RasterBand) SetMetadataItem(name, value, domain string) error

func (*RasterBand) SetNoDataValue 

func (band *RasterBand) SetNoDataValue(val float64) error

Set the no data value for this band

func (*RasterBand) SetOffset 

func (band *RasterBand) SetOffset(offset float64) error

Set scaling offset

func (*RasterBand) SetRasterCategoryNames 

func (band *RasterBand) SetRasterCategoryNames(names []string) error

Set the category names for this band

func (*RasterBand) SetScale 

func (band *RasterBand) SetScale(scale float64) error

Set scaling ratio

func (*RasterBand) SetStatistics 

func (band *RasterBand) SetStatistics(min, max, mean, stdDev float64) error

Set statistics on raster band

func (*RasterBand) SetUnitType 

func (band *RasterBand) SetUnitType(unit string) error

Set unit type

func (*RasterBand) SieveFilter 

func (src *RasterBand) SieveFilter(
	mask, dest *RasterBand,
	threshold, connectedness int,
	options []string,
	progress ProgressFunc,
	data interface{},
) error

Removes small raster polygons

func (*RasterBand) WriteBlock 

func (band *RasterBand) WriteBlock(xOff, yOff int, dataPtr unsafe.Pointer) error

Write a block of image data efficiently

func (*RasterBand) XSize 

func (band *RasterBand) XSize() int

Fetch X size of raster

func (*RasterBand) YSize 

func (band *RasterBand) YSize() int

Fetch Y size of raster

type ResampleAlg 

type ResampleAlg int

type SpatialReference 

type SpatialReference struct {
	// contains filtered or unexported fields
}

func CreateSpatialReference 

func CreateSpatialReference(wkt string) *SpatialReference

Create a new SpatialReference

func (*SpatialReference) AngularUnits 

func (sr *SpatialReference) AngularUnits() (string, float64)

Fetch the angular units for the geographic coordinate system

func (*SpatialReference) AttrValue 

func (sr *SpatialReference) AttrValue(key string, child int) (value string, ok bool)

Fetch indicated attribute of named node

func (*SpatialReference) AuthorityCode 

func (sr *SpatialReference) AuthorityCode(target string) string

Get the authority code for a node

func (*SpatialReference) AuthorityName 

func (sr *SpatialReference) AuthorityName(target string) string

Get the authority name for a node

func (*SpatialReference) AutoIdentifyEPSG 

func (sr *SpatialReference) AutoIdentifyEPSG() error

Set EPSG authority info if possible

func (*SpatialReference) Clone 

func (sr *SpatialReference) Clone() *SpatialReference

Make a duplicate of this spatial reference

func (*SpatialReference) CloneGeogCS 

func (sr *SpatialReference) CloneGeogCS() *SpatialReference

Make a duplicate of the GEOGCS node of this spatial reference

func (*SpatialReference) CopyGeographicCSFrom 

func (sr *SpatialReference) CopyGeographicCSFrom(other *SpatialReference) error

Copy geographic CS from another spatial reference

func (*SpatialReference) Dereference 

func (sr *SpatialReference) Dereference() int

Decrements the reference count by one, returning reference count

func (*SpatialReference) Destroy 

func (sr *SpatialReference) Destroy()

Destroy the spatial reference

func (*SpatialReference) EPSGTreatsAsLatLong 

func (sr *SpatialReference) EPSGTreatsAsLatLong() bool

Return true if EPSG feels this coordinate system should be treated as having lat/long coordinate ordering

func (*SpatialReference) Fixup 

func (sr *SpatialReference) Fixup() error

Fix up spatial reference as needed

func (*SpatialReference) FixupOrdering 

func (sr *SpatialReference) FixupOrdering() error

Correct parameter ordering to match CT specification

func (*SpatialReference) FromEPSG 

func (sr *SpatialReference) FromEPSG(code int) error

Initialize SRS based on EPSG code

func (*SpatialReference) FromEPSGA 

func (sr *SpatialReference) FromEPSGA(code int) error

Initialize SRS based on EPSG code, using EPSG lat/long ordering

func (*SpatialReference) FromERM 

func (sr *SpatialReference) FromERM(proj, datum, units string) error

Import coordinate system from ERMapper projection definitions

func (*SpatialReference) FromESRI 

func (sr *SpatialReference) FromESRI(input string) error

Import coordinate system from ESRI .prj formats

func (*SpatialReference) FromPCI 

func (sr *SpatialReference) FromPCI(proj, units string, params []float64) error

Import coordinate system from PCI projection definition

func (*SpatialReference) FromProj4 

func (sr *SpatialReference) FromProj4(input string) error

Import PROJ.4 coordinate string

func (*SpatialReference) FromURL 

func (sr *SpatialReference) FromURL(url string) error

Import coordinate system from a URL

func (*SpatialReference) FromUSGS 

func (sr *SpatialReference) FromUSGS(projsys, zone int, params []float64, datum int) error

Import coordinate system from USGS projection definition

func (*SpatialReference) FromWKT 

func (sr *SpatialReference) FromWKT(wkt string) error

Initialize SRS based on WKT string

func (*SpatialReference) FromXML 

func (sr *SpatialReference) FromXML(xml string) error

Import coordinate system from XML format (GML only currently)

func (*SpatialReference) InverseFlattening 

func (sr *SpatialReference) InverseFlattening() (float64, error)

Get spheroid inverse flattening axis

func (*SpatialReference) IsCompound 

func (sr *SpatialReference) IsCompound() bool

Return true if compound coordinate system

func (*SpatialReference) IsGeocentric 

func (sr *SpatialReference) IsGeocentric() bool

Return true if geocentric coordinate system

func (SpatialReference) IsGeographic 

func (sr SpatialReference) IsGeographic() bool

Return true if geographic coordinate system

func (*SpatialReference) IsLocal 

func (sr *SpatialReference) IsLocal() bool

Return true if local coordinate system

func (*SpatialReference) IsProjected 

func (sr *SpatialReference) IsProjected() bool

Return true if projected coordinate system

func (*SpatialReference) IsSame 

func (sr *SpatialReference) IsSame(other *SpatialReference) bool

Return true if the coordinate systems describe the same system

func (*SpatialReference) IsSameGeographicCS 

func (sr *SpatialReference) IsSameGeographicCS(other *SpatialReference) bool

Return true if the geographic coordinate systems match

func (*SpatialReference) IsSameVerticalCS 

func (sr *SpatialReference) IsSameVerticalCS(other *SpatialReference) bool

Return true if the vertical coordinate systems match

func (*SpatialReference) IsVertical 

func (sr *SpatialReference) IsVertical() bool

Return true if vertical coordinate system

func (*SpatialReference) LinearUnits 

func (sr *SpatialReference) LinearUnits() (string, float64)

Fetch linear projection units

func (*SpatialReference) MorphFromESRI 

func (sr *SpatialReference) MorphFromESRI() error

Convert in place from ESRI WKT format

func (*SpatialReference) MorphToESRI 

func (sr *SpatialReference) MorphToESRI() error

Convert in place to ESRI WKT format

func (*SpatialReference) NormalizedProjectionParameter 

func (sr *SpatialReference) NormalizedProjectionParameter(
	name string, defaultValue float64,
) (float64, error)

Fetch a normalized projection parameter value

func (*SpatialReference) PrimeMeridian 

func (sr *SpatialReference) PrimeMeridian() (string, float64)

Fetch prime meridian information

func (*SpatialReference) ProjectionParameter 

func (sr *SpatialReference) ProjectionParameter(name string, defaultValue float64) (float64, error)

Fetch a projection parameter value

func (*SpatialReference) Reference 

func (sr *SpatialReference) Reference() int

Increments the reference count by one, returning reference count

func (*SpatialReference) Release 

func (sr *SpatialReference) Release()

Decrements the reference count by one and destroy if zero

func (*SpatialReference) SemiMajorAxis 

func (sr *SpatialReference) SemiMajorAxis() (float64, error)

Get spheroid semi-major axis

func (*SpatialReference) SemiMinorAxis 

func (sr *SpatialReference) SemiMinorAxis() (float64, error)

Get spheroid semi-minor axis

func (*SpatialReference) SetACEA 

func (sr *SpatialReference) SetACEA(
	stdp1, stdp2, centerLat, centerLong, falseEasting, falseNorthing float64,
) error

Set to Albers Conic Equal Area

func (*SpatialReference) SetAE 

func (sr *SpatialReference) SetAE(centerLat, centerLong, falseEasting, falseNorthing float64) error

Set to Azimuthal Equidistant

func (*SpatialReference) SetAngularUnits 

func (sr *SpatialReference) SetAngularUnits(units string, radians float64) error

Set the angular units for the geographic coordinate system

func (*SpatialReference) SetAttrValue 

func (sr *SpatialReference) SetAttrValue(path, value string) error

Set attribute value in spatial reference

func (*SpatialReference) SetAuthority 

func (sr *SpatialReference) SetAuthority(target, authority string, code int) error

Sets the authority for a node

func (*SpatialReference) SetBonne 

func (sr *SpatialReference) SetBonne(standardParallel, centralMeridian, falseEasting, falseNorthing float64) error

Set to Bonne

func (*SpatialReference) SetCEA 

func (sr *SpatialReference) SetCEA(stdp1, centralMeridian, falseEasting, falseNorthing float64) error

Set to Cylindrical Equal Area

func (*SpatialReference) SetCS 

func (sr *SpatialReference) SetCS(centerLat, centerLong, falseEasting, falseNorthing float64) error

Set to Cassini-Soldner

func (*SpatialReference) SetCompoundCS 

func (sr *SpatialReference) SetCompoundCS(
	name string,
	horizontal, vertical *SpatialReference,
) error

Setup a compound coordinate system

func (*SpatialReference) SetEC 

func (sr *SpatialReference) SetEC(
	stdp1, stdp2, centerLat, centerLong, falseEasting, falseNorthing float64,
) error

Set to Equidistant Conic

func (*SpatialReference) SetEckert 

func (sr *SpatialReference) SetEckert(variation int, centralMeridian, falseEasting, falseNorthing float64) error

Set to Eckert I-VI

func (*SpatialReference) SetEquirectangular 

func (sr *SpatialReference) SetEquirectangular(
	centerLat, centerLong, falseEasting, falseNorthing float64,
) error

Set to Equirectangular

func (*SpatialReference) SetEquirectangularGeneralized 

func (sr *SpatialReference) SetEquirectangularGeneralized(
	centerLat, centerLong, psuedoStdParallel, falseEasting, falseNorthing float64,
) error

Set to Equirectangular (generalized form)

func (*SpatialReference) SetFromUserInput 

func (sr *SpatialReference) SetFromUserInput(name string) error

Set spatial reference from various text formats

func (*SpatialReference) SetGEOS 

func (sr *SpatialReference) SetGEOS(
	centralMeridian, satelliteHeight, falseEasting, falseNorthing float64,
) error

Set to GEOS - Geostationary Satellite View

func (*SpatialReference) SetGH 

func (sr *SpatialReference) SetGH(centralMeridian, falseEasting, falseNorthing float64) error

Set to Goode Homolosine

func (*SpatialReference) SetGS 

func (sr *SpatialReference) SetGS(centralMeridian, falseEasting, falseNorthing float64) error

Set to Gall Stereographic

func (*SpatialReference) SetGSTM 

func (sr *SpatialReference) SetGSTM(
	centerLat, centerLong, scale, falseEasting, falseNorthing float64,
) error

Set to Gauss Schreiber Transverse Mercator

func (*SpatialReference) SetGeocentricCS 

func (sr *SpatialReference) SetGeocentricCS(name string) error

Set the user visible geographic CS name

func (*SpatialReference) SetGeographicCS 

func (sr *SpatialReference) SetGeographicCS(
	geogName, datumName, spheroidName string,
	semiMajor, flattening float64,
	pmName string,
	offset float64,
	angularUnits string,
	toRadians float64,
) error

Set geographic coordinate system

func (*SpatialReference) SetGnomonic 

func (sr *SpatialReference) SetGnomonic(
	centerLat, centerLong, falseEasting, falseNorthing float64,
) error

Set to gnomonic

func (*SpatialReference) SetHOM 

func (sr *SpatialReference) SetHOM(
	centerLat, centerLong, azimuth, rectToSkew, scale, falseEasting, falseNorthing float64,
) error

Set to Hotine Oblique Mercator projection using azimuth angle

func (*SpatialReference) SetHOM2PNO 

func (sr *SpatialReference) SetHOM2PNO(
	centerLat, lat1, long1, lat2, long2, scale, falseEasting, falseNorthing float64,
) error

Set to Hotine Oblique Mercator projection using two points on projection centerline

func (*SpatialReference) SetIGH 

func (sr *SpatialReference) SetIGH() error

Set to Interrupted Goode Homolosine

func (*SpatialReference) SetIWMPolyconic 

func (sr *SpatialReference) SetIWMPolyconic(
	lat1, lat2, centerLong, falseEasting, falseNorthing float64,
) error

Set to International Map of the World Polyconic

func (*SpatialReference) SetKrovak 

func (sr *SpatialReference) SetKrovak(
	centerLat, centerLong, azimuth, psuedoStdParallel, scale, falseEasting, falseNorthing float64,
) error

Set to Krovak Oblique Conic Conformal

func (*SpatialReference) SetLAEA 

func (sr *SpatialReference) SetLAEA(
	centerLat, centerLong, falseEasting, falseNorthing float64,
) error

Set to Lambert Azimuthal Equal Area

func (*SpatialReference) SetLCC 

func (sr *SpatialReference) SetLCC(
	stdp1, stdp2, centerLat, centerLong, falseEasting, falseNorthing float64,
) error

Set to Lambert Conformal Conic

func (*SpatialReference) SetLCC1SP 

func (sr *SpatialReference) SetLCC1SP(
	centerLat, centerLong, scale, falseEasting, falseNorthing float64,
) error

Set to Lambert Conformal Conic (1 standard parallel)

func (*SpatialReference) SetLCCB 

func (sr *SpatialReference) SetLCCB(
	stdp1, stdp2, centerLat, centerLong, falseEasting, falseNorthing float64,
) error

Set to Lambert Conformal Conic (Belgium)

func (*SpatialReference) SetLinearUnits 

func (sr *SpatialReference) SetLinearUnits(name string, toMeters float64) error

Set the linear units for the projection

func (*SpatialReference) SetLinearUnitsAndUpdateParameters 

func (sr *SpatialReference) SetLinearUnitsAndUpdateParameters(name string, toMeters float64) error

Set the linear units for the target node and update all existing linear parameters

func (*SpatialReference) SetLocalCS 

func (sr *SpatialReference) SetLocalCS(name string) error

Set the user visible local CS name

func (*SpatialReference) SetMC 

func (sr *SpatialReference) SetMC(
	centerLat, centerLong, falseEasting, falseNorthing float64,
) error

Set to Miller Cylindrical

func (*SpatialReference) SetMercator 

func (sr *SpatialReference) SetMercator(
	centerLat, centerLong, scale, falseEasting, falseNorthing float64,
) error

Set to Mercator

func (*SpatialReference) SetMollweide 

func (sr *SpatialReference) SetMollweide(
	centralMeridian, falseEasting, falseNorthing float64,
) error

Set tp Mollweide

func (*SpatialReference) SetNZMG 

func (sr *SpatialReference) SetNZMG(
	centerLat, centerLong, falseEasting, falseNorthing float64,
) error

Set to New Zealand Map Grid

func (*SpatialReference) SetNormalizedProjectionParameter 

func (sr *SpatialReference) SetNormalizedProjectionParameter(name string, value float64) error

Set a projection parameter with a normalized value

func (*SpatialReference) SetOS 

func (sr *SpatialReference) SetOS(
	originLat, meridian, scale, falseEasting, falseNorthing float64,
) error

Set to Oblique Stereographic

func (*SpatialReference) SetOrthographic 

func (sr *SpatialReference) SetOrthographic(
	centerLat, centerLong, falseEasting, falseNorthing float64,
) error

Set to Orthographic

func (*SpatialReference) SetPS 

func (sr *SpatialReference) SetPS(
	centerLat, centerLong, scale, falseEasting, falseNorthing float64,
) error

Set to Polar Stereographic

func (*SpatialReference) SetPolyconic 

func (sr *SpatialReference) SetPolyconic(
	centerLat, centerLong, falseEasting, falseNorthing float64,
) error

Set to Polyconic

func (*SpatialReference) SetProjectedCS 

func (sr *SpatialReference) SetProjectedCS(name string) error

Set the user visible projected CS name

func (*SpatialReference) SetProjectionByName 

func (sr *SpatialReference) SetProjectionByName(name string) error

Set a projection by name

func (*SpatialReference) SetProjectionParameter 

func (sr *SpatialReference) SetProjectionParameter(name string, value float64) error

Set a projection parameter value

func (*SpatialReference) SetRobinson 

func (sr *SpatialReference) SetRobinson(
	centerLong, falseEasting, falseNorthing float64,
) error

Set to Robinson

func (*SpatialReference) SetSOC 

func (sr *SpatialReference) SetSOC(
	latitudeOfOrigin, centralMeridian, falseEasting, falseNorthing float64,
) error

Set to Swiss Oblique Cylindrical

func (*SpatialReference) SetSinusoidal 

func (sr *SpatialReference) SetSinusoidal(
	centerLong, falseEasting, falseNorthing float64,
) error

Set to Sinusoidal

func (*SpatialReference) SetStatePlane 

func (sr *SpatialReference) SetStatePlane(zone int, nad83 bool) error

Set State Plane projection definition

func (*SpatialReference) SetStatePlaneWithUnits 

func (sr *SpatialReference) SetStatePlaneWithUnits(
	zone int,
	nad83 bool,
	unitName string,
	factor float64,
) error

Set State Plane projection definition

func (*SpatialReference) SetStereographic 

func (sr *SpatialReference) SetStereographic(
	centerLat, centerLong, scale, falseEasting, falseNorthing float64,
) error

Set to Stereographic

func (*SpatialReference) SetTM 

func (sr *SpatialReference) SetTM(
	centerLat, centerLong, scale, falseEasting, falseNorthing float64,
) error

Set to Transverse Mercator

func (*SpatialReference) SetTMG 

func (sr *SpatialReference) SetTMG(
	centerLat, centerLong, falseEasting, falseNorthing float64,
) error

Set to Tunisia Mining Grid

func (*SpatialReference) SetTMSO 

func (sr *SpatialReference) SetTMSO(
	centerLat, centerLong, scale, falseEasting, falseNorthing float64,
) error

Set to Transverse Mercator (South Oriented)

func (*SpatialReference) SetTMVariant 

func (sr *SpatialReference) SetTMVariant(
	variantName string, centerLat, centerLong, scale, falseEasting, falseNorthing float64,
) error

Set to Transverse Mercator variant

func (*SpatialReference) SetTOWGS84 

func (sr *SpatialReference) SetTOWGS84(dx, dy, dz, ex, ey, ez, ppm float64) error

Set the Bursa-Wolf conversion to WGS84

func (*SpatialReference) SetTargetLinearUnits 

func (sr *SpatialReference) SetTargetLinearUnits(target, units string, toMeters float64) error

Set the linear units for the target node

func (*SpatialReference) SetUTM 

func (sr *SpatialReference) SetUTM(zone int, north bool) error

Set UTM projection definition

func (*SpatialReference) SetVDG 

func (sr *SpatialReference) SetVDG(
	centerLong, falseEasting, falseNorthing float64,
) error

Set to VanDerGrinten

func (*SpatialReference) SetVerticalCS 

func (sr *SpatialReference) SetVerticalCS(csName, datumName string, datumType int) error

Set up the vertical coordinate system

func (*SpatialReference) SetWellKnownGeographicCS 

func (sr *SpatialReference) SetWellKnownGeographicCS(name string) error

Set geographic CS based on well known name

func (*SpatialReference) StripCTParams 

func (sr *SpatialReference) StripCTParams() error

Strip OGC CT parameters

func (*SpatialReference) TOWGS84 

func (sr *SpatialReference) TOWGS84() (coeff [7]float64, err error)

Fetch the TOWGS84 parameters if available

func (*SpatialReference) TargetLinearUnits 

func (sr *SpatialReference) TargetLinearUnits(target string) (string, float64)

Fetch linear units for target

func (*SpatialReference) ToMICoordSys 

func (sr *SpatialReference) ToMICoordSys() (output string, errVal error)

Export coordinate system in Mapinfo style CoordSys format

func (*SpatialReference) ToPCI 

func (sr *SpatialReference) ToPCI() (proj, units string, params []float64, errVal error)

Export coordinate system in PCI format

func (*SpatialReference) ToPrettyWKT 

func (sr *SpatialReference) ToPrettyWKT(simplify bool) (string, error)

Export coordinate system to a nicely formatted WKT string

func (*SpatialReference) ToProj4 

func (sr *SpatialReference) ToProj4() (string, error)

Export coordinate system in PROJ.4 format

func (*SpatialReference) ToUSGS 

func (sr *SpatialReference) ToUSGS() (proj, zone int, params []float64, datum int, errVal error)

Export coordinate system to USGS GCTP projection definition

func (*SpatialReference) ToWKT 

func (sr *SpatialReference) ToWKT() (string, error)

Export coordinate system to WKT

func (*SpatialReference) ToXML 

func (sr *SpatialReference) ToXML() (xml string, errVal error)

Export coordinate system in XML format

func (*SpatialReference) UTMZone 

func (sr *SpatialReference) UTMZone() (zone int, north bool)

Get UTM zone information

func (*SpatialReference) Validate 

func (sr *SpatialReference) Validate() error

Validate spatial reference tokens

type StyleMgr 

type StyleMgr struct {
	// contains filtered or unexported fields
}

type StyleTable 

type StyleTable struct {
	// contains filtered or unexported fields
}

type StyleTool 

type StyleTool struct {
	// contains filtered or unexported fields
}

Source Files

View all Source files

Directories

Path Synopsis
examples
test_tiff

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