A pure Go package for coordinate transformations.

Overview

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WGS84

A pure Go package for coordinate transformations.

go get github.com/wroge/wgs84

Usage

east, north, h := wgs84.LonLat().To(wgs84.ETRS89UTM(32)).Round(2)(9, 52, 0)
// 500000 5.76103821e+06 0

east, north, h := wgs84.To(wgs84.WebMercator())(9, 52, 0)
// 1.0018754171394621e+06 6.800125454397305e+06 -9.313225746154785e-10

epsg := wgs84.EPSG()

lon, lat, h := wgs84.ETRS89UTM(32).To(epsg.Code(4326)).Round(3)(500150, 5761200, 0)
// 9.002 52.001 0

// EPSG-Codes covering the coordinate {longitude: 9, latitude: 52}:
codes := epsg.CodesCover(9, 52)
// [25832 4314 32632 4978 4258 31467 4326 3857 900913]

...Calculate EPSG-Code from Unknown Coordinates
...Calculate WebMercator Tile from WGS84 Longitude Latitude
...Transformation between OSGB36 NationalGrid and WGS84 Geographic Coordinates
...Adding a CoordinateReferenceSystem (MGI AustriaLambert) to the EPSG-Repository

Features

  • Helmert Transformation
  • Web Mercator
  • Lambert Conformal Conic
  • Transverse Mercator (UTM)
  • EPSG-Code Coverage
  • ...
  • Easily expandable through simple Interfaces
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Comments
  • transform result accuracy

    transform result accuracy

    Here's my code

    type spheroid struct {
    	a, fi float64
    }
    
    func (s spheroid) A() float64 {
    	return s.a
    }
    
    func (s spheroid) Fi() float64 {
    	return s.fi
    }
    
    func main() {
    	test := wgs84.Datum{
    		Spheroid: spheroid{
    			a:  6378137,
    			fi: 298.257222101,
    		},
    		Area: wgs84.AreaFunc(func(lon, lat float64) bool {
    			if lon < 118.5 || lon > 121.5 || lat < 24.43 || lat > 53.33 {
    				return false
    			}
    			return true
    		}),
    	}
    
    	proj := test.TransverseMercator(120, 0, 1, 500000, 0)
    
    	epsg := wgs84.EPSG()
    	epsg.Add(4549, proj)
    
    	transform := wgs84.Transform(epsg.Code(4549), wgs84.LonLat())
    	f1, f2, f3 := transform(478077, 4025869, 0)
    	fmt.Println(f1, f2, f3)
    
    }
    

    wkt for epsg:4549

    PROJCS["CGCS2000 / 3-degree Gauss-Kruger CM 120E",
        GEOGCS["China Geodetic Coordinate System 2000",
            DATUM["China_2000",
                SPHEROID["CGCS2000",6378137,298.257222101,
                    AUTHORITY["EPSG","1024"]],
                AUTHORITY["EPSG","1043"]],
            PRIMEM["Greenwich",0,
                AUTHORITY["EPSG","8901"]],
            UNIT["degree",0.0174532925199433,
                AUTHORITY["EPSG","9122"]],
            AUTHORITY["EPSG","4490"]],
        PROJECTION["Transverse_Mercator"],
        PARAMETER["latitude_of_origin",0],
        PARAMETER["central_meridian",120],
        PARAMETER["scale_factor",1],
        PARAMETER["false_easting",500000],
        PARAMETER["false_northing",0],
        UNIT["metre",1,
            AUTHORITY["EPSG","9001"]],
        AUTHORITY["EPSG","4549"]]
    

    With my code I got result is [119.75572865201768, 36.36317346481494, -3.6767683923244476e-05] But What I got form epsg.io was [119.7557287, 36.3631738], and from gdaltransform was [119.755728654111, 36.3631737608256, 0]

    So I am wandering what makes these differences? Is there any problems?

    opened by zbml 3
Owner
Malte Wrogemann
Malte Wrogemann
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