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Unified map projections

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ClemensFischer 2026-02-01 17:25:04 +01:00
parent a4bd11e26d
commit 9fe7dccd68
21 changed files with 370 additions and 377 deletions
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22
MapControl/Shared/PolarStereographicProjection.cs
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@ -15,10 +15,13 @@ namespace MapControl
/// </summary>
public class PolarStereographicProjection : MapProjection
{
public double Flattening { get; set; } = Wgs84Flattening;
public double ScaleFactor { get; set; } = 0.994;
public double FalseEasting { get; set; } = 2e6;
public double FalseNorthing { get; set; } = 2e6;
public PolarStereographicProjection(bool north)
{
LatitudeOfOrigin = north ? 90d : -90d;
ScaleFactor = 0.994;
FalseEasting = 2e6;
FalseNorthing = 2e6;
}
public override double GridConvergence(double latitude, double longitude)
{
@ -29,20 +32,17 @@ namespace MapControl
{
var sign = Math.Sign(LatitudeOfOrigin);
var phi = sign * latitude * Math.PI / 180d;
var e = Math.Sqrt((2d - Flattening) * Flattening);
var eSinPhi = e * Math.Sin(phi);
var t = Math.Tan(Math.PI / 4d - phi / 2d)
/ Math.Pow((1d - eSinPhi) / (1d + eSinPhi), e / 2d); // p.161 (15-9)
// r == ρ/a
var r = 2d * ScaleFactor * t / Math.Sqrt(Math.Pow(1d + e, 1d + e) * Math.Pow(1d - e, 1d - e)); // p.161 (21-33)
var m = Math.Cos(phi) / Math.Sqrt(1d - eSinPhi * eSinPhi); // p.160 (14-15)
var k = r / m; // p.161 (21-32)
var transform = new Matrix(k, 0d, 0d, k, 0d, 0d);
transform.Rotate(-sign * longitude);
transform.Rotate(-sign * (longitude - CentralMeridian));
return transform;
}
@ -99,10 +99,9 @@ namespace MapControl
{
}
public Wgs84UpsNorthProjection(string crsId)
public Wgs84UpsNorthProjection(string crsId) : base(true)
{
CrsId = crsId;
LatitudeOfOrigin = 90d;
}
}
@ -118,10 +117,9 @@ namespace MapControl
{
}
public Wgs84UpsSouthProjection(string crsId)
public Wgs84UpsSouthProjection(string crsId) : base(false)
{
CrsId = crsId;
LatitudeOfOrigin = -90d;
}
}
}