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Updated StereographicProjection

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ClemensFischer 2026-02-03 15:13:10 +01:00
parent a3d25b5084
commit 1d62a6e9f3
2 changed files with 27 additions and 18 deletions
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12
MapControl/Shared/MapProjectionFactory.cs
View file

@ -1,5 +1,4 @@
using System;
using System.Globalization;
namespace MapControl
{
@ -33,16 +32,7 @@ namespace MapControl
if (projection == null && crsId.StartsWith(StereographicProjection.DefaultCrsId))
{
var parameters = crsId.Split(',');
if (parameters.Length == 4 &&
parameters[0] == StereographicProjection.DefaultCrsId &&
parameters[1] == "1" &&
double.TryParse(parameters[2], NumberStyles.Float, CultureInfo.InvariantCulture, out double longitude) &&
double.TryParse(parameters[3], NumberStyles.Float, CultureInfo.InvariantCulture, out double latitude))
{
projection = new StereographicProjection(longitude, latitude);
}
projection = new StereographicProjection(crsId);
}
return projection;

33
MapControl/Shared/StereographicProjection.cs
View file

@ -17,12 +17,32 @@ namespace MapControl
{
public const string DefaultCrsId = "AUTO2:97002"; // GeoServer non-standard CRS identifier
public StereographicProjection(double centerLongitude, double centerLatitude, string crsId = DefaultCrsId)
public StereographicProjection(string crsId)
{
var parameters = crsId.Split(',');
if (parameters.Length != 4 ||
string.IsNullOrEmpty(parameters[0]) ||
!double.TryParse(parameters[1], NumberStyles.Float, CultureInfo.InvariantCulture, out double scaleFactor) ||
!double.TryParse(parameters[2], NumberStyles.Float, CultureInfo.InvariantCulture, out double longitude) ||
!double.TryParse(parameters[3], NumberStyles.Float, CultureInfo.InvariantCulture, out double latitude))
{
throw new ArgumentException($"Invalid CRS Identifier {crsId}.", nameof(crsId));
}
CrsId = crsId;
ScaleFactor = scaleFactor;
CentralMeridian = longitude;
LatitudeOfOrigin = latitude;
}
public StereographicProjection(double centerLatitude, double centerLongitude, double scaleFactor = 1d, string crsId = DefaultCrsId)
{
CrsId = string.Format(CultureInfo.InvariantCulture,
"{0},{1:0.########},{2:0.########},{3:0.########}", crsId, scaleFactor, centerLongitude, centerLatitude);
ScaleFactor = scaleFactor;
CentralMeridian = centerLongitude;
LatitudeOfOrigin = centerLatitude;
CrsId = string.Format(CultureInfo.InvariantCulture,
"{0},1,{1:0.########},{2:0.########}", crsId, centerLongitude, centerLatitude);
}
private void GetScaleAndGridConvergence(double latitude, double longitude, out double scale, out double gamma)
@ -41,12 +61,11 @@ namespace MapControl
var cosLambda = Math.Cos(dLambda);
var k1 = 2d / (1d + sinPhi0 * sinPhi1 + cosPhi0 * cosPhi1 * cosLambda);
var k2 = 2d / (1d + sinPhi0 * sinPhi2 + cosPhi0 * cosPhi2 * cosLambda);
var dCosPhi = k2 * cosPhi2 - k1 * cosPhi1;
var dSinPhi = k2 * sinPhi2 - k1 * sinPhi1;
var c = k2 * cosPhi2 - k1 * cosPhi1;
var s = k2 * sinPhi2 - k1 * sinPhi1;
scale = k1;
gamma = Math.Atan2(-sinLambda * dCosPhi,
cosPhi0 * dSinPhi - sinPhi0 * cosLambda * dCosPhi) * 180d / Math.PI;
gamma = Math.Atan2(-sinLambda * c, cosPhi0 * s - sinPhi0 * cosLambda * c) * 180d / Math.PI;
}
public override double GridConvergence(double latitude, double longitude)