#!/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 594.0 942.0 27 56 -gcp 11778.0 951.0 28.5 56 -gcp 11856.0 7536.0 28.5 55.5 -gcp 519.0 7530.0 27 55.5 55_Kraslava_1937.jpg 55_Kraslava_1937.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"594.0 942.0\n519.0 7530.0\n11856.75 7537.500832870627\n11781.0 952.8743753470294\" | \
  gdaltransform -tps -output_xy 55_Kraslava_1937.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  55_Kraslava_1937.vrt 55_Kraslava_1937.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 55_Kraslava_1937.cut.vrt 55_Kraslava_1937.xyz