[gdal-dev] OGR distance different than in ArcGIS

[Hare, Trent]

Uli,
   Unless your neighbors are very localized (in an undistorted projection),
I would recommend using some geodesic methods (in ArcMap or OGR).

For ArcMap, you can beat this free add-on (Tools for Graphics and Shapes)
which does geodesic lengths, areas, and azimuths no matter the input
projection:
http://www.jennessent.com/arcgis/shapes_graphics.htm (very
good documentation)

For OGR, I would recommend running the lat/lon pairs through or Haversine
or Vincenty's equations.
examples:
Haversine:
http://stackoverflow.com/questions/11703407/how-to-calculate-distance-between-points-on-python-side-of-my-appplication-in-wa
Vincenty's:
https://code.google.com/p/pyroms/source/browse/trunk/pyroms/greatcircle.py?r=58

Good luck,
Trent



On Wed, Mar 6, 2013 at 5:33 PM, Uli Strötz <ustroetz at gmail.com> wrote:

> Thanks for your answers. I tried number two and the files are projected in
> Albers (meters) (see attachment). The results are still the same as being
> unprojected. Is there a way to tell GDAL to only use the Projected
> Coordinate System instead of the CRS?
>
>
>
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