#!/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 1585.5 1319.3603064066851 27.5 56.75 -gcp 12139.5 1344.1094707520892 28 56.75 -gcp 12156.75 10965.84213091922 28 56.5 -gcp 1528.5 10942.561838440111 27.5 56.5 103-Ludza_1937.jpg 103-Ludza_1937.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"1585.5 1319.3603064066851\n12139.5 1344.1094707520892\n12156.75 10965.84213091922\n1528.5 10942.561838440111\" | \
  gdaltransform -tps -output_xy 103-Ludza_1937.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  103-Ludza_1937.vrt 103-Ludza_1937.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 103-Ludza_1937.cut.vrt 103-Ludza_1937.xyz