[Proj] website cartographic executables---Inv_Fwd
Oscar van Vlijmen
ovv at hetnet.nl
Tue Dec 20 00:39:24 EST 2005
> From: "Gerald I. Evenden" <gerald.evenden-verizon.net>
> Just an added note here: check the NGS site for full precision online
> geodesic computations:
I use it since version 1. Here & there are still version 1 implementations
alive, but I strongly recommend to update to the latest version. Better
accuracy, especially around antipodal point.
One pitfall silly ol' me fell into, long ago: I thought the 3d version gave
the true arc length going from height 1 in point 1 to height 2 in point 2.
But the functions only work with ellipsoidal distances as if the heights
The accuracy is according to Vincenty only 0.01 mm for meridional arcs, not
full machine precision.
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