#!/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 495.0 843.0 18 58 -gcp 9786.0 714.0 21 58 -gcp 9993.0 6552.0 21 57 -gcp 438.0 6672.0 18 57 RKKA500_O-34-V_Gotland_1941_greif_NORTH.jpg RKKA500_O-34-V_Gotland_1941_greif_NORTH.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "495.0 843.0\n5139.0 825.0258476931627\n9786.0 714.0\n9993.0 6552.0\n5214.0 6661.52751528627\n438.0 6672.0" | \
  gdaltransform -tps -output_xy RKKA500_O-34-V_Gotland_1941_greif_NORTH.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  RKKA500_O-34-V_Gotland_1941_greif_NORTH.vrt RKKA500_O-34-V_Gotland_1941_greif_NORTH.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_NORTH.cut.vrt RKKA500_O-34-V_Gotland_1941_greif_NORTH.xyz