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## Geodesics on an ellipsoid of revolution (DEPRECATED)

version 1.43.1 (26.2 KB) by

Solutions of the direct and inverse geodesic problems

Updated

This package is now DEPRECATED. Its functionality has been incorporated
into
GeographicLib toolbox
http://www.mathworks.com/matlabcentral/fileexchange/50605

Charles Karney

### Charles Karney (view profile)

There's a bad bug in the area calculation in the Matlab routine
geodreckon. Probably, most people calculate areas as part of the
solution of inverse problem using geoddistance; this might explain why
this bug has gone unnoticed for so long. Here is the fix which will be
included in the next release of GeographicLib.

--- old/geographiclib-matlab/geodreckon.m 2014-10-02 08:08:46.000000000 -0400
+++ new/geographiclib-matlab/geodreckon.m 2014-10-28 18:02:05.000000000 -0400
@@ -225,7 +225,7 @@

if areap
C4x = C4coeff(n);
- C4a = C4f(eps, C4x);
+ C4a = C4f(epsi, C4x);
A4 = (a^2 * e2) * calp0 .* salp0;
B41 = SinCosSeries(false, ssig1, csig1, C4a);
B42 = SinCosSeries(false, ssig2, csig2, C4a);

Ryan

### Ryan (view profile)

This... is absolutely wonderful. I spent ages looking for a toolbox that would calculate geodesic areas. I figured that my only two options would be to purchase the MATLAB mapping toolbox or write a routine myself. I'm so glad I finally found this. Thank you kindly, sir.

littyer

### littyer (view profile)

nice

 27 Jul 2015 1.43.1 Reinforce deprecation by shortening the description, removing the tags, and replacing the image. 22 May 2015 1.43 Synchronize with GeographicLib 1.43. Fix bug in the long_unroll feature of geodreckon. 27 Apr 2015 1.13 Deprecation notice. Use the GeographicLib toolbox instead. 22 Apr 2015 1.12 Update to GeographicLib 1.41.1. Point fix for geodarea.m to handle polygons which encircle the pole multiple times. E.g., geodarea(89+zeros(6,1), [-360:120:240]') used to return -2.5500e+14 (incorrect); it now returns 3.2415e+10 (correct). 21 Nov 2014 1.11 Offer as toolbox. 12 Nov 2014 1.10 Uncheck toolbox 11 Nov 2014 1.9 Synchronize with GeographicLib 1.39. Fix the bug in geodreckon noted on 2014-10-29. Provide the option to prevent the longitude returned in geodreckon from being reduced to [-180,180). 2 Oct 2014 1.8 Synchronize with GeographicLib 1.38. Minor documentation changes only. 2 Jul 2013 1.7 Minor improvements to the calculation of short geodesics and the computation of areas. 16 Jan 2013 1.6 Update journal reference. 11 Dec 2012 1.5 Update to GeographicLib 1.28. Fixes 2 bugs: (1) incorrect area returned in certain obscure cases; (2) m12 incorrect for meridional geodesics. 3 Dec 2012 1.3 Synchronize files with GeographicLib 1.27.
##### MATLAB Release
MATLAB 8.4 (R2014b)