#!/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 4035.0 1869.0 24.333333333333332 58 -gcp 22680.0 1914.0 26.333333333333332 58 -gcp 22839.0 19455.0 26.333333333333332 57 -gcp 3717.0 19410.0 24.333333333333332 57 1944_Osteuropa_Walk_300K__mapywig_comp.jpg 1944_Osteuropa_Walk_300K__mapywig_comp.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "4035.0 1869.0\n22680.0 1914.0\n22839.0 19455.0\n3717.0 19410.0" | \
  gdaltransform -tps -output_xy 1944_Osteuropa_Walk_300K__mapywig_comp.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  1944_Osteuropa_Walk_300K__mapywig_comp.vrt 1944_Osteuropa_Walk_300K__mapywig_comp.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 1944_Osteuropa_Walk_300K__mapywig_comp.cut.vrt 1944_Osteuropa_Walk_300K__mapywig_comp.xyz