[GRASS-user] how to make radiometric correction of Aster level 1A image in GRASS GIS

[Nikos Alexandris]

* Rengifo Ortega:

> Dear Grass Community,

Hi!


> I have a ASTL1A image (HDF4), which I intend to use to generate a DEM using the stereo pipeline, called AMES (NASA software). 
> 
> I extracted the nadir (3N) and the back looking (3B) image, using "gdal_translate" and found out that both images present stripes. Then, read that ASTL1A images are not  radiometric corrected. This will create  problem when matching automatically the overlapping  images i.e.  3N and 3B to create a DEM.

I did not know about the _Ames Stereo Pipeline (ASP)_; looks like this
question at GIS.SE <http://gis.stackexchange.com/q/77088/5256>, has an answer!

 
> So, I wonder how to make a radiometric correction on ASTER Level 1A images.
> Have anyone of you (grass users) tried to do this in GRASS GIS e.g using r.mapcalc or python?. Currently I am using GRASS GIS 6.4 on ubuntu 12.04. 

Support for ASTER spectral bands exists already in i.atcorr; see <http://grass.osgeo.org/grass64/manuals/i.atcorr.html> (or/and <http://grass.osgeo.org/grass70/manuals/i.atcorr.html> if you get GRASS 7.0 -- look at <https://launchpad.net/~grass/+archive/ubuntu/grass-stable>). There is an example "parameters file" for i.atcorr in GRASS-Wiki, though it is for Landsat data. There might be some ASTER related examples in the mailing list's archive. 


Please have also a look at:

- <http://grass.osgeo.org/grass64/manuals/r.in.aster.html> (or/and <http://grass.osgeo.org/grass70/manuals/r.in.aster.html>)
- <http://grass.osgeo.org/grass70/manuals/i.aster.toar.html>
- if i.aster.toar wont work-out, have a look at http://grasswiki.osgeo.org/wiki/User:NikosA#ASTER_L1B (bash shell script only!)


Hope this helps a bit, Nikos