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Updated map projections

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This commit is contained in:
ClemensFischer 2026-01-29 23:27:39 +01:00
parent d790200cf1
commit 359cbe8908
4 changed files with 84 additions and 52 deletions
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48
MapProjections/Shared/ProjNetMapProjection.cs
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@ -15,7 +15,7 @@ namespace MapControl.Projections
/// </summary>
public class ProjNetMapProjection : MapProjection
{
protected MapProjection FallbackProjection { get; }
protected MapProjection FallbackProjection { get; private set; }
protected ProjNetMapProjection(MapProjection fallbackProjection)
{
@ -49,10 +49,10 @@ namespace MapControl.Projections
field = value ??
throw new ArgumentNullException(nameof(value));
var name = field.Projection?.Name ??
var projection = field.Projection ??
throw new ArgumentException("CoordinateSystem.Projection must not be null.", nameof(value));
IsNormalCylindrical = name.StartsWith("Mercator") || name.Contains("Pseudo-Mercator");
IsNormalCylindrical = projection.Name.StartsWith("Mercator") || projection.Name.Contains("Pseudo-Mercator");
var transformFactory = new CoordinateTransformationFactory();
@ -67,6 +67,48 @@ namespace MapControl.Projections
CrsId = !string.IsNullOrEmpty(field.Authority) && field.AuthorityCode > 0
? $"{field.Authority}:{field.AuthorityCode}"
: string.Empty;
var ellipsoid = field.GeographicCoordinateSystem.HorizontalDatum.Ellipsoid;
if (projection.Name.Contains("Pseudo-Mercator"))
{
FallbackProjection = new MapControl.WebMercatorProjection
{
EquatorialRadius = ellipsoid.SemiMajorAxis
};
}
else if (projection.Name.StartsWith("Mercator"))
{
FallbackProjection = new MapControl.WorldMercatorProjection
{
EquatorialRadius = ellipsoid.SemiMajorAxis,
Flattening = 1d / ellipsoid.InverseFlattening
};
}
else if (projection.Name.StartsWith("Transverse_Mercator"))
{
FallbackProjection = new TransverseMercatorProjection
{
EquatorialRadius = ellipsoid.SemiMajorAxis,
Flattening = 1d / ellipsoid.InverseFlattening,
CentralMeridian = projection.GetParameter("central_meridian").Value,
ScaleFactor = projection.GetParameter("scale_factor").Value,
FalseEasting = projection.GetParameter("false_easting").Value,
FalseNorthing = projection.GetParameter("false_northing").Value
};
}
else if (projection.Name.StartsWith("Polar_Stereographic"))
{
FallbackProjection = new PolarStereographicProjection
{
EquatorialRadius = ellipsoid.SemiMajorAxis,
Flattening = 1d / ellipsoid.InverseFlattening,
ScaleFactor = projection.GetParameter("scale_factor").Value,
FalseEasting = projection.GetParameter("false_easting").Value,
FalseNorthing = projection.GetParameter("false_northing").Value,
Hemisphere = projection.GetParameter("latitude_of_origin").Value >= 0 ? Hemisphere.North : Hemisphere.South
};
}
}
}