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Updated map projections

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ClemensFischer 2026-01-24 20:13:05 +01:00
parent 9c02647c59
commit 98f057ca0c
4 changed files with 6 additions and 12 deletions
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4
MapControl/Shared/AzimuthalEquidistantProjection.cs
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@ -9,12 +9,12 @@ using Avalonia;
namespace MapControl
{
/// <summary>
/// Spherical Azimuthal Equidistant Projection - No standard CRS identifier.
/// Spherical Azimuthal Equidistant Projection - AUTO2:97003.
/// See "Map Projections - A Working Manual" (https://pubs.usgs.gov/publication/pp1395), p.195-197.
/// </summary>
public class AzimuthalEquidistantProjection : AzimuthalProjection
{
public const string DefaultCrsId = "AUTO2:97003"; // proprietary CRS identifier
public const string DefaultCrsId = "AUTO2:97003"; // GeoServer non-standard CRS identifier
public AzimuthalEquidistantProjection() // parameterless constructor for XAML
: this(DefaultCrsId)

4
MapProjections/Shared/ProjNetMapProjection.cs
View file

@ -49,9 +49,7 @@ namespace MapControl.Projections
var name = field.Projection?.Name ??
throw new ArgumentException("CoordinateSystem.Projection must not be null.", nameof(value));
IsNormalCylindrical = name.StartsWith("Mercator") ||
name.StartsWith("Equirectangular") ||
name.Contains("Pseudo-Mercator");
IsNormalCylindrical = name.StartsWith("Mercator") || name.Contains("Pseudo-Mercator");
var transformFactory = new CoordinateTransformationFactory();

8
MapProjections/Shared/Wgs84OrthographicProjection.cs
View file

@ -1,5 +1,4 @@
using System;
using System.Globalization;
using System.Globalization;
#if WPF
using System.Windows.Media;
#endif
@ -38,11 +37,8 @@ namespace MapControl.Projections
public override Matrix RelativeScale(double latitude, double longitude)
{
var p = new AzimuthalProjection.ProjectedPoint(Center.Latitude, Center.Longitude, latitude, longitude);
var h = p.CosC; // p.149 (20-5)
var scale = new Matrix(h, 0d, 0d, 1d, 0d, 0d);
scale.Rotate(-Math.Atan2(p.Y, p.X) * 180d / Math.PI);
return scale;
return p.RelativeScale(p.CosC, 1d); // p.149 (20-5), k == 1
}
}
}

2
MapProjections/Shared/Wgs84StereographicProjection.cs
View file

@ -39,7 +39,7 @@ namespace MapControl.Projections
var p = new AzimuthalProjection.ProjectedPoint(Center.Latitude, Center.Longitude, latitude, longitude);
var k = 2d / (1d + p.CosC); // p.157 (21-4), k0 == 1
return new Matrix(k, 0d, 0d, k, 0d, 0d);
return p.RelativeScale(k, k);
}
}
}