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44 lines
1.6 KiB
C#
44 lines
1.6 KiB
C#
#if WPF
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using System.Windows;
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#elif AVALONIA
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using Avalonia;
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#endif
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namespace MapControl.Projections
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{
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/// <summary>
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/// Elliptical Mercator Projection implemented by setting the WKT property of a GeoApiProjection.
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/// See "Map Projections - A Working Manual" (https://pubs.usgs.gov/pp/1395/report.pdf), p.44-45.
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/// </summary>
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public class WorldMercatorProjection : GeoApiProjection
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{
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public WorldMercatorProjection()
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{
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CoordinateSystemWkt
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= "PROJCS[\"WGS 84 / World Mercator\","
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+ "GEOGCS[\"WGS 84\","
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+ "DATUM[\"WGS_1984\",SPHEROID[\"WGS 84\",6378137,298.257223563]],"
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+ GeoApiProjectionFactory.PrimeMeridianGreenwich + ","
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+ GeoApiProjectionFactory.UnitDegree + ","
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+ "AUTHORITY[\"EPSG\",\"4326\"]],"
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+ "PROJECTION[\"Mercator_1SP\"],"
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+ "PARAMETER[\"latitude_of_origin\",0],"
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+ "PARAMETER[\"central_meridian\",0],"
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+ "PARAMETER[\"scale_factor\",1],"
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+ "PARAMETER[\"false_easting\",0],"
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+ "PARAMETER[\"false_northing\",0],"
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+ GeoApiProjectionFactory.UnitMeter + ","
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+ GeoApiProjectionFactory.AxisEasting + ","
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+ GeoApiProjectionFactory.AxisNorthing + ","
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+ "AUTHORITY[\"EPSG\",\"3395\"]]";
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}
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public override Point RelativeScale(double latitude, double longitude)
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{
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var k = MapControl.WorldMercatorProjection.ScaleFactor(latitude);
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return new Point(k, k);
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}
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}
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}
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