#!/bin/bash

GDAL_TILE_PROCESSES=16
GDAL_TILE_ZOOMS=8-14
GDAL_SAMPLING_WARP=cubic
GDAL_SAMPLING_TILE=antialias

# Create virtual dataset with coordinates
gdal_translate -of VRT -a_srs EPSG:4326 -outsize 300% 300% -gcp 0.0 0.0 21.148421823427867 57.79778399989836 -gcp 17541.0 0.0 22.78254159703784 57.68023160681908 -gcp 17541.0 15414.0 22.570085732402696 56.919300878096955 -gcp 0.0 15414.0 20.969910367791478 57.03628033044027 Viduseuropas_specialas_topografiskas_kartes_Ventspils__6828_A1_L43_6_02.JPG Viduseuropas_specialas_topografiskas_kartes_Ventspils__6828_A1_L43_6_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 -cutline "POLYGON((903 1040, 932.5 3823.4997223764576, 4957 3801, 4928 1015, 903 1040))" Viduseuropas_specialas_topografiskas_kartes_Ventspils__6828_A1_L43_6_02.vrt Viduseuropas_specialas_topografiskas_kartes_Ventspils__6828_A1_L43_6_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Viduseuropas_specialas_topografiskas_kartes_Ventspils__6828_A1_L43_6_02.cut.vrt Viduseuropas_specialas_topografiskas_kartes_Ventspils__6828_A1_L43_6_02.xyz