Rank: 1060 based on 149 downloads (last 30 days) and 3 files submitted
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Charles Karney

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SRI International
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Files Posted by Charles Karney View all
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21 Nov 2014 Screenshot Geodesics on an ellipsoid of revolution Solutions of the direct and inverse geodesic problems Author: Charles Karney area, distance, geodesy, geodesic, ellipsoid, earth 74 3
  • 5.0
5.0 | 2 ratings
21 Nov 2014 Screenshot Geodesic projections for an ellipsoid Four map projections based on geodesics Author: Charles Karney map projections, geodesics, azimuthal equidistant, gnomonic, cassinisoldner, transverse mercator 38 2
  • 5.0
5.0 | 1 rating
21 Nov 2014 Great ellipses Solution of direct and inverse problems for great ellipses Author: Charles Karney ellipsoid, navigation, wgs84, great ellipse, distance, earth 37 0
Comments and Ratings by Charles Karney View all
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29 Oct 2014 Geodesics on an ellipsoid of revolution Solutions of the direct and inverse geodesic problems Author: 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);

16 Jun 2013 Vectorized geodetic distance and azimuth on the WGS84 earth ellipsoid Geodetic distance, forward azimuth, and return azimuth between coordinates Author: Michael Kleder

You might be interested in the geodist function in
http://www.mathworks.com/matlabcentral/fileexchange/39108. This offers the same functionality as vdist without the convergence problems of Vincenty's algorithm.

Comments and Ratings on Charles Karney's Files View all
Updated File Comment by Comments Rating
29 Oct 2014 Geodesics on an ellipsoid of revolution Solutions of the direct and inverse geodesic problems Author: Charles Karney 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);

13 Jan 2014 Geodesic projections for an ellipsoid Four map projections based on geodesics Author: Charles Karney Peter Manley-Cooke

After downloading the earlier submission by this author (as indicated at the bottom of the description), this program provides instant answers. Well Done.

13 Jan 2014 Geodesic projections for an ellipsoid Four map projections based on geodesics Author: Charles Karney Peter Manley-Cooke

Line one of the Description should contain the information that the mapping toolbox is required for this submission.

21 Dec 2013 Geodesics on an ellipsoid of revolution Solutions of the direct and inverse geodesic problems Author: Charles Karney Ryan

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 Geodesics on an ellipsoid of revolution Solutions of the direct and inverse geodesic problems Author: Charles Karney littyer

nice

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