Hi all, I solved the down reported issues. I change -ot Float32 to -ot Float64 and it works. Anyway Float32 should be enough to store the max value of 560459513003129 < 3.4E38 but probably during the multi-core several values are stored in the same array and it needs Float64.
ciao ciao Giuseppe On 24 September 2012 17:53, Giuseppe Amatulli <[email protected]> wrote: > Hi, > i'm running gdal_rasterize for several *.shp using xargs, sending > the process to 10 cpu. > > 1) ls /weldgfs/p51/gius_urban/pop_urban/2010/shp_albers/*.shp | > xargs -n 1 -P 10 bash > /weldgfs/p51/gius_urban/pop_urban/scripts/sc2a_shp_rasterizeP30_2010.sh > > the same process can be run using one processor. > > 2) ls /weldgfs/p51/gius_urban/pop_urban/2010/shp_albers/*.shp | > xargs -n 1 -P 1 bash > /weldgfs/p51/gius_urban/pop_urban/scripts/sc2a_shp_rasterizeP30_2010.sh > > Inputs and outputs are independent in each process so no issues in > reading/writing the same file. > > The obtained tifs produced by the gdal_rasterize > (gdal_rasterize -a_nodata 0 -ot Float32 -co 'COMPRESS=LZW' -te > $geo_string_tif -tr 30 30 -l $filename -a BLOCKID10 > $INDIR/$filename.shp $OUTDIR/$filename"_"$tile".tif" ; > where BLOCKID10 is an integer number if e.g 550 019 505 012 101 ) > > should be same but is not the case. > Line 2) produce the tif perfect similar with the attribute of the shp; > so no issues. > Line 1) burn the same BLOCKID10 value for several polygons, resulting > in less final polygons. > Seems to me that this phenomena manly effect BLOCKID10 > values having several "0" (e.g. 10979900000033 ; 10030101002035) > > May question is. Can be possible that the gdal driver used inside C > code not support multi-core processing? > If yes it is possible to find a solution to run gdal_rasterize in parallel. > Any idea? > > Thanks in advance > Giuseppe > > -- > Web: www.spatial-ecology.net -- Giuseppe Amatulli Web: www.spatial-ecology.net _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
