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 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 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 (
	EarthRadius = RMajor
)

Variables

var Com float64

var Eccent float64

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

Functions

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 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