#!/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 462.0 129.0 18 57 -gcp 9795.0 15.0 21 57 -gcp 9984.0 5712.0 21 56 -gcp 405.0 5826.0 18 56 RKKA500_O-34-V_Gotland_1941_greif_SOUTH.jpg RKKA500_O-34-V_Gotland_1941_greif_SOUTH.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "462.0 129.0\n5125.5 112.52251250694829\n9795.0 15.0\n9984.0 5712.0\n5200.5 5814.025013896609\n405.0 5826.0" | \
  gdaltransform -tps -output_xy RKKA500_O-34-V_Gotland_1941_greif_SOUTH.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  RKKA500_O-34-V_Gotland_1941_greif_SOUTH.vrt RKKA500_O-34-V_Gotland_1941_greif_SOUTH.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES RKKA500_O-34-V_Gotland_1941_greif_SOUTH.cut.vrt RKKA500_O-34-V_Gotland_1941_greif_SOUTH.xyz