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46 lines
1.7 KiB
C#
46 lines
1.7 KiB
C#
using System;
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namespace MapControl.Projections
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{
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/// <summary>
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/// NAD83 Universal Transverse Mercator Projection.
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/// </summary>
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public class Nad83UtmProjection : GeoApiProjection
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{
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public const int FirstZone = 1;
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public const int LastZone = 23;
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public const int FirstZoneEpsgCode = 26900 + FirstZone;
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public const int LastZoneEpsgCode = 26900 + LastZone;
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public int Zone { get; }
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public Nad83UtmProjection(int zone)
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{
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if (zone < FirstZone || zone > LastZone)
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{
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throw new ArgumentException($"Invalid NAD83 UTM zone {zone}.", nameof(zone));
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}
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Zone = zone;
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CoordinateSystemWkt
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= $"PROJCS[\"NAD83 / UTM zone {zone}N\","
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+ "GEOGCS[\"NAD83\","
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+ "DATUM[\"North_American_Datum_1983\","
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+ "SPHEROID[\"GRS 1980\",6378137,298.257222101]],"
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+ GeoApiProjectionFactory.PrimeMeridian + ","
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+ GeoApiProjectionFactory.UnitDegree + ","
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+ "AUTHORITY[\"EPSG\",\"4269\"]],"
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+ GeoApiProjectionFactory.ProjectionTM + ","
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+ "PARAMETER[\"latitude_of_origin\",0],"
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+ $"PARAMETER[\"central_meridian\",{6 * zone - 183}],"
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+ "PARAMETER[\"scale_factor\",0.9996],"
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+ "PARAMETER[\"false_easting\",500000],"
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+ "PARAMETER[\"false_northing\",0],"
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+ GeoApiProjectionFactory.UnitMeter + ","
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+ GeoApiProjectionFactory.AxisEast + ","
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+ GeoApiProjectionFactory.AxisNorth + ","
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+ $"AUTHORITY[\"EPSG\",\"269{zone:00}\"]]";
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}
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}
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}
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