ClemensFischer/XAML-Map-Control
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Renamed delta lambda

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ClemensFischer 2026-02-03 22:20:58 +01:00
parent 8afa480ec0
commit e7f1ef820e
3 changed files with 24 additions and 24 deletions
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12
MapControl/Shared/StereographicProjection.cs
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@ -50,15 +50,15 @@ namespace MapControl
var phi0 = LatitudeOfOrigin * Math.PI / 180d; // φ1
var phi1 = latitude * Math.PI / 180d;
var phi2 = (latitude + 1e-3) * Math.PI / 180d;
var dLambda = (longitude - CentralMeridian) * Math.PI / 180d; // λ - λ0
var lambda = (longitude - CentralMeridian) * Math.PI / 180d; // λ - λ0
var sinPhi0 = Math.Sin(phi0);
var cosPhi0 = Math.Cos(phi0);
var sinPhi1 = Math.Sin(phi1);
var cosPhi1 = Math.Cos(phi1);
var sinPhi2 = Math.Sin(phi2);
var cosPhi2 = Math.Cos(phi2);
var sinLambda = Math.Sin(dLambda);
var cosLambda = Math.Cos(dLambda);
var sinLambda = Math.Sin(lambda);
var cosLambda = Math.Cos(lambda);
var k1 = 2d / (1d + sinPhi0 * sinPhi1 + cosPhi0 * cosPhi1 * cosLambda);
var k2 = 2d / (1d + sinPhi0 * sinPhi2 + cosPhi0 * cosPhi2 * cosLambda);
var c = k2 * cosPhi2 - k1 * cosPhi1;
@ -89,13 +89,13 @@ namespace MapControl
{
var phi0 = LatitudeOfOrigin * Math.PI / 180d; // φ1
var phi = latitude * Math.PI / 180d; // φ
var dLambda = (longitude - CentralMeridian) * Math.PI / 180d; // λ - λ0
var lambda = (longitude - CentralMeridian) * Math.PI / 180d; // λ - λ0
var sinPhi0 = Math.Sin(phi0);
var cosPhi0 = Math.Cos(phi0);
var sinPhi = Math.Sin(phi);
var cosPhi = Math.Cos(phi);
var sinLambda = Math.Sin(dLambda);
var cosPhiCosLambda = cosPhi * Math.Cos(dLambda);
var sinLambda = Math.Sin(lambda);
var cosPhiCosLambda = cosPhi * Math.Cos(lambda);
var x = cosPhi * sinLambda;
var y = cosPhi0 * sinPhi - sinPhi0 * cosPhiCosLambda;
var k = 2d / (1d + sinPhi0 * sinPhi + cosPhi0 * cosPhiCosLambda); // p.157 (21-4), k0 == 1