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Fixed RelativeTransform of azimuthal projections

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ClemensFischer 2026-01-28 09:52:11 +01:00
parent 8d25310b8e
commit 3922297e7b
12 changed files with 72 additions and 39 deletions
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10
MapControl/Shared/TransverseMercatorProjectionSnyder.cs
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@ -47,10 +47,8 @@ namespace MapControl
public override Matrix RelativeTransform(double latitude, double longitude)
{
// h = k/k0 for relative scale
var h = 1d;
// γ, meridian convergence angle
var gamma = 0d;
var k = ScaleFactor;
var gamma = 0d; // γ, meridian convergence angle
if (latitude > -90d && latitude < 90d)
{
@ -69,14 +67,14 @@ namespace MapControl
var A4 = A2 * A2;
var A6 = A2 * A4;
h = 1d + (1d + C) * A2 / 2d +
k *= 1d + (1d + C) * A2 / 2d +
(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);
}
var transform = new Matrix(h, 0d, 0d, h, 0d, 0d);
var transform = new Matrix(k, 0d, 0d, k, 0d, 0d);
transform.Rotate(-gamma * 180d / Math.PI);
return transform;