#!/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 2427.0 1716.0 24.333333333333332 57 -gcp 21615.0 1803.0 26.333333333333332 57 -gcp 21783.0 19317.0 26.333333333333332 56 -gcp 2040.0 19224.0 24.333333333333332 56 1943_Osteuropa_300K_T57_Jakobstadt__Jekabpils__Ausg_Comp.jpg 1943_Osteuropa_300K_T57_Jakobstadt__Jekabpils__Ausg_Comp.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2427.0 1716.0\n21615.0 1803.0\n21783.0 19317.0\n2040.0 19224.0" | \
  gdaltransform -tps -output_xy 1943_Osteuropa_300K_T57_Jakobstadt__Jekabpils__Ausg_Comp.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  1943_Osteuropa_300K_T57_Jakobstadt__Jekabpils__Ausg_Comp.vrt 1943_Osteuropa_300K_T57_Jakobstadt__Jekabpils__Ausg_Comp.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 1943_Osteuropa_300K_T57_Jakobstadt__Jekabpils__Ausg_Comp.cut.vrt 1943_Osteuropa_300K_T57_Jakobstadt__Jekabpils__Ausg_Comp.xyz