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Geodesics on an ellipsoid of revolution (DEPRECATED)

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Geodesics on an ellipsoid of revolution (DEPRECATED)



20 Nov 2012 (Updated )

Solutions of the direct and inverse geodesic problems

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This package is now DEPRECATED. Its functionality has been incorporated
    GeographicLib toolbox


Geographiclib inspired this file.

Required Products MATLAB
MATLAB release MATLAB 8.4 (R2014b)
MATLAB Search Path
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Comments and Ratings (3)
29 Oct 2014 Charles Karney

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);

Comment only
21 Dec 2013 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.

03 Feb 2013 littyer


03 Dec 2012 1.3

Synchronize files with GeographicLib 1.27.

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.

16 Jan 2013 1.6

Update journal reference.

02 Jul 2013 1.7

Minor improvements to the calculation of short geodesics and the computation of areas.

02 Oct 2014 1.8

Synchronize with GeographicLib 1.38.
Minor documentation changes only.

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).

12 Nov 2014 1.10

Uncheck toolbox

21 Nov 2014 1.11

Offer as toolbox.

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).

27 Apr 2015 1.13

Deprecation notice. Use the GeographicLib toolbox instead.

22 May 2015 1.43

Synchronize with GeographicLib 1.43.
Fix bug in the long_unroll feature of geodreckon.

27 Jul 2015 1.43.1

Reinforce deprecation by shortening the description, removing
the tags, and replacing the image.

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