I have looked everywhere and can not find a tool to convert a geotiff file to a simple ascii elevation file... did I miss something?
thanks for any pointers!
You should be able to do this using the
To convert to Arc/Info ASCII Grid:
To convert to ASCII Gridded XYZ:
Binary executables of the GDAL tools are available here: http://trac.osgeo.org/gdal/wiki/DownloadingGdalBinaries
In GRASS GIS, the command r.out.xyz does this conversion job. Instead of first importing the GeoTIFF file, you can simply register it beforehand with r.external in the GRASS GIS location (i.e. basically the needed project directory).