#!/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 333.0 798.0 24.5 56.25 -gcp 14904.0 870.0 25 56.25 -gcp 14892.0 13980.0 25 56 -gcp 231.0 13890.0 24.5 56 Lat075_051_Birzi_ca1930.jpg Lat075_051_Birzi_ca1930.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"333.0 798.0\n14904.0 870.0\n14892.0 13980.0\n231.0 13890.0\" | \
  gdaltransform -tps -output_xy Lat075_051_Birzi_ca1930.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  Lat075_051_Birzi_ca1930.vrt Lat075_051_Birzi_ca1930.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Lat075_051_Birzi_ca1930.cut.vrt Lat075_051_Birzi_ca1930.xyz