XAML-Map-Control/MapProjections/Shared/WorldMercatorProjection.cs

#if WPF
using System.Windows.Media;
#endif

namespace MapControl.Projections
{
    /// <summary>
    /// Elliptical Mercator Projection implemented by setting the WKT property of a ProjNetMapProjection.
    /// See "Map Projections - A Working Manual" (https://pubs.usgs.gov/pp/1395/report.pdf), p.44-45.
    /// </summary>
    public class WorldMercatorProjection : ProjNetMapProjection
    {
        public WorldMercatorProjection()
        {
            CoordinateSystemWkt =
                "PROJCS[\"WGS 84 / World Mercator\"," +
                WktConstants.GeogCsWgs84 + "," +
                "PROJECTION[\"Mercator_1SP\"]," +
                "PARAMETER[\"latitude_of_origin\",0]," +
                "PARAMETER[\"central_meridian\",0]," +
                "PARAMETER[\"scale_factor\",1]," +
                "PARAMETER[\"false_easting\",0]," +
                "PARAMETER[\"false_northing\",0]," +
                "UNIT[\"metre\",1,AUTHORITY[\"EPSG\",\"9001\"]]," +
                "AXIS[\"Easting\",EAST]," +
                "AXIS[\"Northing\",NORTH]," +
                "AUTHORITY[\"EPSG\",\"3395\"]]";
        }

        public override Matrix RelativeScale(double latitude, double longitude)
        {
            var k = MapControl.WorldMercatorProjection.RelativeScale(latitude);

            return new Matrix(k, 0d, 0d, k, 0d, 0d);
        }
    }
}