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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22
MapControl/Shared/TransverseMercatorProjection.cs
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@ -70,11 +70,11 @@ 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)
@ -83,16 +83,16 @@ namespace MapControl
var phi = latitude * Math.PI / 180d;
var sinPhi = Math.Sin(phi);
// λ - λ0
var dLambda = (longitude - CentralMeridian) * Math.PI / 180d;
var cosLambda = Math.Cos(dLambda);
var tanLambda = Math.Tan(dLambda);
var lambda = (longitude - CentralMeridian) * Math.PI / 180d;
var cosLambda = Math.Cos(lambda);
var tanLambda = Math.Tan(lambda);
// t
var t = Math.Sinh(Atanh(sinPhi) - f2 * Atanh(f2 * sinPhi));
var u = Math.Sqrt(1d + t * t);
// ξ'
var xi_ = Math.Atan2(t, cosLambda);
// η'
var eta_ = Atanh(Math.Sin(dLambda) / u);
var eta_ = Atanh(Math.Sin(lambda) / u);
// σ
var sigma = 1 +
2d * a1 * Math.Cos(2d * xi_) * Math.Cosh(2d * eta_) +
@ -124,11 +124,11 @@ namespace MapControl
// t
var t = Math.Sinh(Atanh(sinPhi) - f2 * Atanh(f2 * sinPhi));
// λ - λ0
var dLambda = (longitude - CentralMeridian) * Math.PI / 180d;
var lambda = (longitude - CentralMeridian) * Math.PI / 180d;
// ξ'
var xi_ = Math.Atan2(t, Math.Cos(dLambda));
var xi_ = Math.Atan2(t, Math.Cos(lambda));
// η'
var eta_ = Atanh(Math.Sin(dLambda) / Math.Sqrt(1d + t * t));
var eta_ = Atanh(Math.Sin(lambda) / Math.Sqrt(1d + t * t));
// k0 * A
var k0A = ScaleFactor * EquatorialRadius * f1;
@ -171,11 +171,11 @@ namespace MapControl
d2 * Math.Sin(4d * chi) +
d3 * Math.Sin(6d * chi);
// λ - λ0
var dLambda = Math.Atan2(Math.Sinh(eta_), Math.Cos(xi_));
var lambda = Math.Atan2(Math.Sinh(eta_), Math.Cos(xi_));
return new Location(
phi * 180d / Math.PI,
dLambda * 180d / Math.PI + CentralMeridian);
lambda * 180d / Math.PI + CentralMeridian);
}
#if NETFRAMEWORK