#!/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 23.37853210729501 57.63223820370484 -gcp 17364.0 0.0 25.000853448698592 57.502245093283484 -gcp 17364.0 15414.0 24.765903890983324 56.7373938616214 -gcp 0.0 15414.0 23.203535444565127 56.86693330457998 Viduseuropas_specialas_topografiskas_kartes_Daugavgriva__6828_A1_L43_8_02.JPG Viduseuropas_specialas_topografiskas_kartes_Daugavgriva__6828_A1_L43_8_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 -cutline "POLYGON((894 992, 873.75 3762.5002776235424, 4887 3809, 4911 1033, 894 992))" Viduseuropas_specialas_topografiskas_kartes_Daugavgriva__6828_A1_L43_8_02.vrt Viduseuropas_specialas_topografiskas_kartes_Daugavgriva__6828_A1_L43_8_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_Daugavgriva__6828_A1_L43_8_02.cut.vrt Viduseuropas_specialas_topografiskas_kartes_Daugavgriva__6828_A1_L43_8_02.xyz