Note: This document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade, and read the current manual page.
For the resulting maps GDAL VRT text files are created either in a directory named "gdal" in the current mapset or in a user-defined vrt_directory. Those files are not removed when the raster map is removed and the user is responsible for removing them when needed.
# Create external example data regs='s,0,1000 n,500,1500' eval `g.gisenv` external_path="${GISDBASE}/${LOCATION}/${MAPSET}/.tmp/vrt" mkdir -p "$external_path" for reg in $regs do r=$(echo $reg | cut -f1 -d",") s=$(echo $reg | cut -f2 -d",") n=$(echo $reg | cut -f3 -d",") g.region -g n=$n s=$s w=0 e=1000 res=1 r.external.out format=GTiff options="compress=LZW,PREDICTOR=3" \ directory="$external_path" r.mapcalc --o --v expression="${r}_${s}_gtiff_ntfs=float(x()*y())" done # Run performance tests g.region -g n=1500 s=0 w=0 e=1000 res=1 format_type=gtiff_ntfs rmaps=$(g.list type=raster pattern="*_*_${format_type}", sep=",") # Using GRASS GIS VRT r.buildvrt --o --v input="$rmaps" output=vrt_${format_type} time r.univar map=vrt_${format_type} # Using GDAL VRT r.buildvrt.gdal --o --v input="$rmaps" output=vrt_${format_type}_gdal time r.univar map=vrt_${format_type}_gdal
Available at: r.buildvrt.gdal source code (history)
Latest change: Wednesday Oct 16 13:27:01 2024 in commit: 261b8fa424db397d138705b6ae6ab8a016cded69
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