[Proj] Distance calculation

[Hamish]

support.mn at elisanet.fi a écrit:
> > > There is a windows program that can calculate distances on a sphere.
> > > It can be downloaded here
> > > http://www.elisanet.fi/master.navigator/xCalc/
> > > 
> > > It is free and can also calculate other expressions and functions.

Jean-Claude Repetto kirjoitti: 
> > It is not free :

lisanet.fi writes:
> It is practically free. After a while it asks you to order,
> but there is the "Later" button. You can cointinue to push
> "Later" for ever and it does not stop to calculate.

cue libre vs. gratis "debate". I will try to short circuit that with
two lines of code and a small png image...


> > - I couldn't find the source code
> 
> Source code is not free. The executable is.

great circle distance calcs on a sphere is no problem -- I've attached
a small Matlab (or GNU/Octave...) script that I wrote some time ago which
does that (formula gleaned from MathWorld). Adjust +a to taste.


I was more concerned with distance along the WGS84 ellipsoid; a big thanks
to all for the interesting tips & references in that regard.


regards,
Hamish



      
-------------- next part --------------
A non-text attachment was scrubbed...
Name: great_circle_distance.png
Type: image/png
Size: 3335 bytes
Desc: not available
URL: <http://lists.osgeo.org/pipermail/proj/attachments/20081015/6999a331/attachment.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: gcircle_fn.m
Type: application/octet-stream
Size: 1274 bytes
Desc: not available
URL: <http://lists.osgeo.org/pipermail/proj/attachments/20081015/6999a331/attachment.obj>