#!/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 519.0 1122.0 28 56.333333333333336 -gcp 6672.0 1062.0 28.5 56.333333333333336 -gcp 6720.0 8853.0 28.5 56 -gcp 522.0 8862.0 28 56 001/O-35-141.jpg O-35-141.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "519.0 1122.0\n6672.0 1062.0\n6720.0 8853.0\n522.0 8862.0" | \
  gdaltransform -tps -output_xy O-35-141.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  O-35-141.vrt O-35-141.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES O-35-141.cut.vrt O-35-141.xyz