webmercator

Documentation

Overview

Package webmercator does the translation to and from WebMercator and WGS84 Gotten from: http://wiki.openstreetmap.org/wiki/Mercator#C.23

Index

• Constants
• Variables
• func DegToRad(deg float64) float64
• func LatToY(lat float64) float64
• func LonToX(lon float64) float64
• func PLatToY(lat float64) float64
• func PLonToX(lon float64) float64
• func PToLonLat(c ...float64) ([]float64, error)
• func PToXY(c ...float64) ([]float64, error)
• func PXToLon(x float64) float64
• func PYToLat(y float64) float64
• func RadToDeg(rad float64) float64
• func ToLonLat(c ...float64) ([]float64, error)
• func ToXY(c ...float64) ([]float64, error)
• func XToLon(x float64) float64
• func YToLat(y float64) float64

Constants

const (
	RMajor = 6378137.0
	RMinor = 6356752.3142
	Ratio  = RMinor / RMajor
)

const (
	SRID        = 3857
	EarthRadius = RMajor
	Deg2Rad     = math.Pi / 180
	Rad2Deg     = 180 / math.Pi
	PiDiv2      = math.Pi / 2.0
	PiDiv4      = math.Pi / 4.0
	MinXExtent  = -20026376.39
	MinYExtent  = -20048966.10
	MaxXExtent  = 20026376.39
	MaxYExtent  = 20048966.10
)

Variables

var Com float64

var Eccent float64

var ErrCoordsRequire2Values = errors.New("Coords should have at least 2 coords")

var Extent = [4]float64{MinXExtent, MinYExtent, MaxXExtent, MaxYExtent}

Functions

func DegToRad

func DegToRad(deg float64) float64

func LatToY

func LatToY(lat float64) float64

LatToY converts from Latitude to a Y coordinate in WebMercator.

func LonToX

func LonToX(lon float64) float64

LonToX converts from a Longitude to a X coordinate in WebMercator.

func PLatToY

func PLatToY(lat float64) float64

func PLonToX

func PLonToX(lon float64) float64

func PToLonLat

func PToLonLat(c ...float64) ([]float64, error)

PToLonLat given a set of coordinates (x,y) it will convert them to Lon/Lat coordinates. If more then x,y is given (i.e. z, and m) they will be returned untransformed.

func PToXY

func PToXY(c ...float64) ([]float64, error)

PToXY given a set of coordinates (lon,lat) it will convert them to X,Y coordinates. If more then lon/lat is given (i.e. z, and m) they will be returned untransformed.

func PXToLon

func PXToLon(x float64) float64

func PYToLat

func PYToLat(y float64) float64

func RadToDeg

func RadToDeg(rad float64) float64

func ToLonLat

func ToLonLat(c ...float64) ([]float64, error)

ToLonLat given a set of coordinates (x,y) it will convert them to Lon/Lat coordinates. If more then x,y is given (i.e. z, and m) they will be returned untransformed.

func ToXY

func ToXY(c ...float64) ([]float64, error)

ToXY given a set of coordinates (lon,lat) it will convert them to X,Y coordinates. If more then lon/lat is given (i.e. z, and m) they will be returned untransformed.

func XToLon

func XToLon(x float64) float64

XToLon converts from X coordinate in WebMercator to Lontitude in WGS84

func YToLat

func YToLat(y float64) float64

YToLat converts from Y coordinate in WebMercator to Latitude in WGS84