Extend map projections

MapProjections/Shared/Nad27UtmProjection.cs

@@ -0,0 +1,50 @@
+// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
+// © 2022 Clemens Fischer
+// Licensed under the Microsoft Public License (Ms-PL)
+
+using System;
+
+namespace MapControl.Projections
+{
+    /// <summary>
+    /// NAD27 UTM Projection with zone number.
+    /// </summary>
+    public class Nad27UtmProjection : GeoApiProjection
+    {
+        public const int FirstZone = 1;
+        public const int LastZone = 22;
+        public const int FirstZoneEpsgCode = 26700 + FirstZone;
+        public const int LastZoneEpsgCode = 26700 + LastZone;
+
+        public int Zone { get; }
+
+        public Nad27UtmProjection(int zone)
+        {
+            if (zone < FirstZone || zone > LastZone)
+            {
+                throw new ArgumentException($"Invalid NAD27 UTM zone {zone}.", nameof(zone));
+            }
+
+            Zone = zone;
+            CoordinateSystemWkt
+                = $"PROJCS[\"NAD27 / UTM zone {zone}N\","
+                + "GEOGCS[\"NAD27\","
+                + "DATUM[\"North_American_Datum_1927\","
+                + "SPHEROID[\"Clarke 1866\",6378206.4,294.978698213898],"
+                + "]," //"EXTENSION[\"PROJ4_GRIDS\",\"NTv2_0.gsb\"]]," -- not recognized
+                + "PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],"
+                + "UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9122\"]],"
+                + "AUTHORITY[\"EPSG\",\"4267\"]],"
+                + "PROJECTION[\"Transverse_Mercator\"],"
+                + "PARAMETER[\"latitude_of_origin\",0],"
+                + $"PARAMETER[\"central_meridian\",{6 * zone - 183}],"
+                + "PARAMETER[\"scale_factor\",0.9996],"
+                + "PARAMETER[\"false_easting\",500000],"
+                + "PARAMETER[\"false_northing\",0],"
+                + "UNIT[\"metre\",1,AUTHORITY[\"EPSG\",\"9001\"]],"
+                + "AXIS[\"Easting\",EAST],"
+                + "AXIS[\"Northing\",NORTH],"
+                + $"AUTHORITY[\"EPSG\",\"267{zone}\"]]";
+        }
+    }
+}