Hi Bulent, See some answers below.
Michael ____________________ C. Michael Barton Director, Center for Social Dynamics & Complexity Professor of Anthropology, School of Human Evolution & Social Change Arizona State University voice: 480-965-6262 (SHESC), 480-727-9746 (CSDC) fax: 480-965-7671 (SHESC), 480-727-0709 (CSDC) www: http://www.public.asu.edu/~cmbarton, http://csdc.asu.edu On Jul 28, 2010, at 2:04 AM, <[email protected]> wrote: > Date: Wed, 28 Jul 2010 12:04:06 +0300 > From: Bulent Arikan <[email protected]> > Subject: [GRASS-user] patching > To: [email protected] > Message-ID: > <[email protected]> > Content-Type: text/plain; charset="iso-8859-1" > > Dear List, > > I have several ASTER GDEM (originally Latlong) images that I want to > reinterpolate from 30 to 10 m res. I also need to patch these images. I am > not sure whether: > > - I should patch them in Latlong using r.series, reproject into UTM and > interpolate them using r.resamp.rst or If you patch, use r.patch, not r.series. > > - reproject images individually into UTM, interpolate individually using > r.resamp.rst and then patch them using r.series. IMHO, your first option will be the most accurate. However, the reprojection and resampling will take a long time because you will have a very big map to work with. Also, read the manual for r.resamp.rst carefully. IIRC, there are a couple tricks you need to remember about how to set the region resolution prior to running r.resamp.rst. As an alternative, you can create a point file using r.to.vect, so that you get a point for the center of each original raster cell. Then you can set the region to 10m and use v.surf.rst or v.surf.bspline to interpolate a new map. > > So far, I tried the second option. After cubic reprojection and > interpolation to 10m the tiles have little borders of NULL areas when I > display them together. They don't go away when patched. This is because you tried to patch after reprojection. > > I will appreciate any advice > Thanks. > -- > B?LENT ARIKAN, PhD > School of Human Evolution and Social Change > Arizona State University > Tempe - AZ > 85287-2402 _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
