#!/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 3060.0 1428.0 20.333333333333332 57 -gcp 17418.0 1431.0 22.333333333333332 57 -gcp 17643.0 14517.0 22.333333333333332 56 -gcp 2904.0 14505.0 20.333333333333332 56 1944_Osteuropa_300K_R57_Libau_Liepaja_mapywig.jpg 1944_Osteuropa_300K_R57_Libau_Liepaja_mapywig.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "3060.0 1428.0\n17418.0 1431.0\n17643.0 14517.0\n2904.0 14505.0" | \
  gdaltransform -tps -output_xy 1944_Osteuropa_300K_R57_Libau_Liepaja_mapywig.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  1944_Osteuropa_300K_R57_Libau_Liepaja_mapywig.vrt 1944_Osteuropa_300K_R57_Libau_Liepaja_mapywig.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 1944_Osteuropa_300K_R57_Libau_Liepaja_mapywig.cut.vrt 1944_Osteuropa_300K_R57_Libau_Liepaja_mapywig.xyz