Geo

Documentation

Overview

Geo Geographic Conversion Tools Based on: http://www.cgms-info.org/documents/pdf_cgms_03.pdf

Index

• Variables
• func Deg2Rad(deg float64) float64
• func LonLat2XY(satLon, lon, lat float64, coff int, cfac float64, loff int, lfac float64) (c, l int)
• func LonLat2XYf(satLon, lon, lat float64, coff int, cfac float64, loff int, lfac float64) (c, l float64)
• func Rad2Deg(rad float64) float64
• func XY2LonLat(satLon float64, c, l, coff int, cfac float64, loff int, lfac float64) (lat, lon float64)
• type Converter
  • func MakeGeoConverter(satelliteLongitude float64, coff, loff int, cfac, lfac float64, fixAspect bool, ...) *Converter
  • func MakeGeoConverterFromXRIT(xh *XRIT.Header) (*Converter, error)
  • func MakeSimpleGeoConverter(satelliteLongitude float64, coff, loff int, cfac, lfac float64) *Converter
  • func (gc *Converter) ColumnOffset() int
  • func (gc *Converter) CropLeft() int
  • func (gc *Converter) Hash() string
  • func (gc *Converter) LatLon2XY(lat, lon float64) (x, y int)
  • func (gc *Converter) LatLon2XYf(lat, lon float64) (x, y float64)
  • func (gc *Converter) LatitudeCoverage() float64
  • func (gc *Converter) LineOffset() int
  • func (gc *Converter) LongitudeCoverage() float64
  • func (gc *Converter) MaxLatitude() float64
  • func (gc *Converter) MaxLongitude() float64
  • func (gc *Converter) MinLatitude() float64
  • func (gc *Converter) MinLongitude() float64
  • func (gc *Converter) TrimLatitude() float64
  • func (gc *Converter) TrimLongitude() float64
  • func (gc *Converter) XY2LatLon(x, y int) (lat, lon float64)

Variables

var MAXLAT = Deg2Rad(79)

var MAXLON = Deg2Rad(75)

var MINLAT = Deg2Rad(-79)

var MINLON = Deg2Rad(-75)

Functions

func Deg2Rad

func Deg2Rad(deg float64) float64

func LonLat2XY

func LonLat2XY(satLon, lon, lat float64, coff int, cfac float64, loff int, lfac float64) (c, l int)

func LonLat2XYf

func LonLat2XYf(satLon, lon, lat float64, coff int, cfac float64, loff int, lfac float64) (c, l float64)

func Rad2Deg

func Rad2Deg(rad float64) float64

func XY2LonLat

func XY2LonLat(satLon float64, c, l, coff int, cfac float64, loff int, lfac float64) (lat, lon float64)

Types

type Converter

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

func MakeGeoConverter

func MakeGeoConverter(satelliteLongitude float64, coff, loff int, cfac, lfac float64, fixAspect bool, imageWidth int) *Converter

MakeGeoConverter Creates a new instance of GeoConverter

satelliteLongitude => Satellite longitude.
coff => Column Offset
loff => Line Offset
cfac => Column Scaling Factor
lfac => Line Scaling Factor
fixAspect => If the aspect ratio should be fixed for cutting image
imageWidth => Image Width in pixels

func MakeGeoConverterFromXRIT

func MakeGeoConverterFromXRIT(xh *XRIT.Header) (*Converter, error)

MakeGeoConverterFromXRIT Creates a new instance of GeoConverter from a XRIT File Header

func MakeSimpleGeoConverter

func MakeSimpleGeoConverter(satelliteLongitude float64, coff, loff int, cfac, lfac float64) *Converter

MakeSimpleGeoConverter Creates a new instance of GeoConverter

Same as MakeGeoConverter but with fixAspect disabled and imageWidth = 0
satelliteLongitude => Satellite longitude.
coff => Column Offset
loff => Line Offset
cfac => Column Scaling Factor
lfac => Line Scaling Factor

func (*Converter) ColumnOffset

func (gc *Converter) ColumnOffset() int

ColumnOffset returns the number of pixels that the image is offset from left

func (*Converter) CropLeft

func (gc *Converter) CropLeft() int

CropLeft returns the number of pixels that should be cropped

func (*Converter) Hash

func (gc *Converter) Hash() string

func (*Converter) LatLon2XY

func (gc *Converter) LatLon2XY(lat, lon float64) (x, y int)

LatLon2XY Converts Latitude/Longitude to Pixel X/Y lat => Latitude in Degrees lon => Longitude in Degrees

func (*Converter) LatLon2XYf

func (gc *Converter) LatLon2XYf(lat, lon float64) (x, y float64)

LatLon2XYf Converts Latitude/Longitude to Pixel X/Y (float64) lat => Latitude in Degrees lon => Longitude in Degrees

func (*Converter) LatitudeCoverage

func (gc *Converter) LatitudeCoverage() float64

LatitudeCoverage returns Coverage of the view in Latitude Degrees

func (*Converter) LineOffset

func (gc *Converter) LineOffset() int

LineOffset returns the number of pixels that the image is offset from top

func (*Converter) LongitudeCoverage

func (gc *Converter) LongitudeCoverage() float64

LongitudeCoverage returns Coverage of the view in Longitude Degrees

func (*Converter) MaxLatitude

func (gc *Converter) MaxLatitude() float64

MaxLatitude returns the Maximum Visible Latitude

func (*Converter) MaxLongitude

func (gc *Converter) MaxLongitude() float64

MaxLongitude returns Maximum visible Longitude

func (*Converter) MinLatitude

func (gc *Converter) MinLatitude() float64

MinLatitude returns Minimum Visible Latitude

func (*Converter) MinLongitude

func (gc *Converter) MinLongitude() float64

MinLongitude returns Minimum visible latitude

func (*Converter) TrimLatitude

func (gc *Converter) TrimLatitude() float64

TrimLatitude returns Latitude Trim parameter for removing artifacts on Reprojection (in degrees)

func (*Converter) TrimLongitude

func (gc *Converter) TrimLongitude() float64

TrimLongitude returns Longitude Trim parameter for removing artifacts on Reprojection (in degrees)

func (*Converter) XY2LatLon

func (gc *Converter) XY2LatLon(x, y int) (lat, lon float64)

XY2LatLon Converts Pixel X/Y to Latitude/Longitude lat => Latitude in Degrees lon => Longitude in Degrees