#!/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 1144.5 1515.1587743732591 27 57 -gcp 13634.25 1484.4271587743733 27.5 57 -gcp 13701.0 12967.607381615599 27.5 56.75 -gcp 1133.25 13007.392896935933 27 56.75 93-Tilza_1934.jpg 93-Tilza_1934.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"1144.5 1515.1587743732591\n13634.25 1484.4271587743733\n13701.0 12967.607381615599\n1133.25 13007.392896935933\" | \
  gdaltransform -tps -output_xy 93-Tilza_1934.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  93-Tilza_1934.vrt 93-Tilza_1934.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 93-Tilza_1934.cut.vrt 93-Tilza_1934.xyz