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Use mean radius in distance calculations

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ClemensFischer 2026-01-09 08:13:07 +01:00
parent c187f323a8
commit 23a8e49efb
8 changed files with 20 additions and 14 deletions
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6
MapControl/Shared/MapProjection.cs
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@ -29,7 +29,11 @@ namespace MapControl
public const double Wgs84EquatorialRadius = 6378137d;
public const double Wgs84MeterPerDegree = Wgs84EquatorialRadius * Math.PI / 180d;
public const double Wgs84Flattening = 1d / 298.257223563;
public static readonly double Wgs84Eccentricity = Math.Sqrt((2d - Wgs84Flattening) * Wgs84Flattening);
// Arithmetic mean radius (2*a + b) / 3 == (1 - f/3) * a
// https://en.wikipedia.org/wiki/Earth_radius#Arithmetic_mean_radius
//
public const double Wgs84MeanRadius = (1d - Wgs84Flattening / 3d) * Wgs84EquatorialRadius;
public static MapProjectionFactory Factory
{