XAML-Map-Control/MapProjections/Shared/Ed50UtmProjection.cs

using System;

namespace MapControl.Projections
{
    /// <summary>
    /// ED50 Universal Transverse Mercator Projection.
    /// </summary>
    public class Ed50UtmProjection : ProjNetMapProjection
    {
        public const int FirstZone = 28;
        public const int LastZone = 38;
        public const int FirstZoneEpsgCode = 23000 + FirstZone;
        public const int LastZoneEpsgCode = 23000 + LastZone;

        public int Zone { get; }

        public Ed50UtmProjection(int zone)
            : base(new TransverseMercatorProjection
            {
                EquatorialRadius = 6378388d,
                Flattening = 297,
                CentralMeridian = 6 * zone - 183,
            })
        {
            if (zone < FirstZone || zone > LastZone)
            {
                throw new ArgumentException($"Invalid ED50 UTM zone {zone}.", nameof(zone));
            }

            Zone = zone;
            CoordinateSystemWkt =
                $"PROJCS[\"ED50 / UTM zone {zone}N\"," +
                WktConstants.GeogCsEd50 + "," +
                "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\",\"230{zone:00}\"]]";
        }
    }
}