Hi Helmut, On Sun, Jul 15, 2012 at 10:14 PM, Helmut Kudrnovsky <hel...@web.de> wrote:
> > using GDAL Virtual Format [1] by building a virtual dataset by > gdalbuildvrt? > > it's really a nice gdal utility: > > no need to patch all ASTER GDEM tiles within grass, just import the virtual > dataset by r.in.gdal or link it by r.external > > > [1] http://www.gdal.org/gdal_vrttut.html > [2] http://www.gdal.org/gdalbuildvrt.html > > I decided to follow your hint and explore the way of gdalbuildvrt. I'm using: gdalbuildvrt -input_file_list /home/leomarg/Desktop/aster/elenco_aster_europa \ /home/leomarg/Desktop/aster/mosaic.vrt and the process takes only few seconds, without complaining. The problem raises when i try to import it in GRASS: r.external input=/home/leomarg/Desktop/aster/mosaic.vrt output=mosaic Projection of input dataset and current location appear to match Importing band 1 of 1... ERROR 4: `ASTGTM_N33E000_dem_lzw.tif' does not exist in the file system, and is not recognised as a supported dataset name. Link to raster map <mosaic> created r.info map=mosaic +----------------------------------------------------------------------------+ | Layer: mosaic Date: Tue Jul 17 15:43:08 2012 | | Mapset: PERMANENT Login of Creator: leomarg | | Location: ASTER_GDEM | | DataBase: /forest/GRASS/grassdata | | Title: ( mosaic ) | | Timestamp: none | |----------------------------------------------------------------------------| | | | Type of Map: raster Number of Categories: 0 | | Data Type: CELL | | Rows: 140401 | | Columns: 198001 | | Total Cells: 27799538401 | | Projection: Latitude-Longitude | | N: 72:00:00.5N S: 32:59:59.5N Res: 0:00:01 | | E: 44:00:00.5E W: 11:00:00.5W Res: 0:00:01 | | Range of data: min = 0 max = 0 | | | | Data Description: | | generated by r.external | | | | Comments: | | r.external input="/home/leomarg/Desktop/aster/mosaic.vrt" output="mo\ | | saic" | | | +----------------------------------------------------------------------------+ what am i missing? Thanks! -- Dr. Margherita Di Leo
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