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fitnr/downsample-polygonize.sh

Created January 25, 2019 14:49
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downsample-polygonize.sh
#!/bin/bash
set -e
DIR=$1
SHP=$2
TMP=$(mktemp -d)
export DIR
downsample() {
gdalwarp -q -r max -tap -tr 0.0001 0.0001 -co NUM_THREADS=2 -of VRT -overwrite "${DIR}/${1}.tif" "${TMP}/${1}.vrt"
gdal_calc.py --quiet --format gtiff --overwrite --type=Byte --NoDataValue 0 --co COMPRESS=CCITTFAX4 --co NBITS=1 -A "${TMP}/${1}.vrt" --outfile "${TMP}/${1}.tif" --calc "A == 1"
}
export -f downsample
basename -s.tif ${DIR}/*.tif | parallel -j 15 downsample
gdalbuildvrt "$TMP/overview.vrt" $TMP/*.tif
gdal_polygonize.py -f 'ESRI Shapefile' $TMP/overview.vrt "$SHP"
rm -r $TMP
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