#!/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 528.0 1074.0 27 56.166666666666664 -gcp 11550.0 1053.0 27.25 56.166666666666664 -gcp 11613.0 14214.0 27.25 56 -gcp 537.0 14241.0 27 56 mapster/RKKA050_O-35-139-C_Somerseta_1938_greif.jpg RKKA050_O-35-139-C_Somerseta_1938_greif.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "528.0 1074.0\n11550.0 1053.0\n11613.0 14214.0\n537.0 14241.0" | \
  gdaltransform -tps -output_xy RKKA050_O-35-139-C_Somerseta_1938_greif.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  RKKA050_O-35-139-C_Somerseta_1938_greif.vrt RKKA050_O-35-139-C_Somerseta_1938_greif.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES RKKA050_O-35-139-C_Somerseta_1938_greif.cut.vrt RKKA050_O-35-139-C_Somerseta_1938_greif.xyz