[GRASS-user] Projection Units and Values Negatively Affect r.topidx Results

Hamish hamish_b at yahoo.com
Thu Feb 18 03:01:21 EST 2010


Rich wrote:
>  Res: 32.81948362
..
>   Note that the _horizontal_ data units are meters but the resolution
> is 32.81948362 which is approximately the English (feet)
> equivalent of 10
> meters. So, when I resample this map to 5 meters resolution
> r.info reports:
...
> Res: 4.99982001


it looks like the map units are really given in feet, and the raster is
at 10m resoluton (converted to feet), and you have resampled it to 5 foot
resolution, not 5m.

as in another email, overlaying 'd.grid -w' might help provide a reality
check as to what is going on.


Hamish



      


More information about the grass-user mailing list