[GRASS-dev] satellite image import and processing

[Markus Metz]

Hi all,

I have added thin plate spline coordinate transformation to i.rectify,
needed for e.g. level 1 B satellite imagery such as NOAA AVHRR or
ENVISAT MERIS, or maybe also historical maps with unknown but serious
geometric distortions.

Additionally I have modified r.in.gdal a bit: previously it exited
with a fatal error if the specified target location (Name of location
to read projection from for GCPs transformation) did not exist.
Because an input xy raster can have GCPs with their own valid
projection information, r.in.gdal will now create this target location
if not existent, using the projection information of the GCPs (not the
raster). That also means that if the target GCP location did not
exist, the imported raster maps can now be georectified straight away
with i.rectify, using the embedded GCPs. The behaviour with regard to
r.in.gdal's location option (using the raster's projection info) is
unchanged.

Markus M