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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14
MapControl/Shared/TransverseMercatorProjectionSnyder.cs
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@ -40,11 +40,11 @@ namespace MapControl
// φ
var phi = latitude * Math.PI / 180d;
// λ - λ0
var dLambda = (longitude - CentralMeridian) * Math.PI / 180d;
var lambda = (longitude - CentralMeridian) * Math.PI / 180d;
// γ calculation for the sphere is sufficiently accurate
//
return Math.Atan(Math.Tan(dLambda) * Math.Sin(phi)) * 180d / Math.PI;
return Math.Atan(Math.Tan(lambda) * Math.Sin(phi)) * 180d / Math.PI;
}
public override Matrix RelativeTransform(double latitude, double longitude)
@ -58,13 +58,13 @@ namespace MapControl
var sinPhi = Math.Sin(phi);
var cosPhi = Math.Cos(phi);
var tanPhi = sinPhi / cosPhi;
var dLambda = (longitude - CentralMeridian) * Math.PI / 180d;
var lambda = (longitude - CentralMeridian) * Math.PI / 180d;
var e2 = (2d - Flattening) * Flattening;
var e_2 = e2 / (1d - e2); // (8-12)
var T = tanPhi * tanPhi; // (8-13)
var C = e_2 * cosPhi * cosPhi; // (8-14)
var A = dLambda * cosPhi; // (8-15)
var A = lambda * cosPhi; // (8-15)
var A2 = A * A;
var A4 = A2 * A2;
var A6 = A2 * A4;
@ -73,7 +73,7 @@ namespace MapControl
(5d - 4d * T + 42d * C + 13d * C * C - 28d * e_2) * A4 / 24d +
(61d - 148d * T + 16 * T * T) * A6 / 720d; // (8-11)
gamma = Math.Atan(Math.Tan(dLambda) * sinPhi) * 180d / Math.PI;
gamma = Math.Atan(Math.Tan(lambda) * sinPhi) * 180d / Math.PI;
}
var transform = new Matrix(k, 0d, 0d, k, 0d, 0d);
@ -161,12 +161,12 @@ namespace MapControl
var phi = phi0 - N1 * tanPhi0 / R1 * (D2 / 2d - (5d + 3d * T1 + 10d * C1 - 4d * C1 * C1 - 9d * e_2) * D4 / 24d +
(61d + 90d * T1 + 45d * T1 * T1 + 298 * C1 - 3d * C1 * C1 - 252d * e_2) * D6 / 720d); // (8-17)
var dLambda = (D - (1d + 2d * T1 + C1) * D3 / 6d +
var lambda = (D - (1d + 2d * T1 + C1) * D3 / 6d +
(5d - 2d * C1 - 3d * C1 * C1 + 28d * T1 + 24d * T1 * T1 + 8d * e_2) * D5 / 120d) / cosPhi0; // (8-18)
return new Location(
phi * 180d / Math.PI,
dLambda * 180d / Math.PI + CentralMeridian);
lambda * 180d / Math.PI + CentralMeridian);
}
private double MeridianDistance(double phi)