[GRASS-user] aerial photo rectification with coarse elevantion model

[Markus Neteler]

On Tue, Dec 24, 2013 at 7:46 AM, Stefan Kiefer <st_kiefer at web.de> wrote:
> Hi,
> for orthorectifying aerial photographs I tried using the srtm data.
> Unfortunately the coarse resolution leads to remarkably distortions
...

Yes, that's expected when the resolution of the aerial image and the
DEM do not match.

> Has anyone an idea how to interpolate a dem with
> a finer resolution?

Yes, please check
http://grasswiki.osgeo.org/wiki/Interpolation#Resampling_of_raster_maps_to_finer_resolution
--> r.resamp.interp , method=bilinear

Markus