#!/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 510.0 402.0 21.5 56.333333333333336 -gcp 5604.0 444.0 22 56.333333333333336 -gcp 5568.0 6564.0 22 56 -gcp 438.0 6510.0 21.5 56 001/O-34-140.jpg O-34-140.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "510.0 402.0\n5604.0 444.0\n5568.0 6564.0\n438.0 6510.0" | \
  gdaltransform -tps -output_xy O-34-140.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  O-34-140.vrt O-34-140.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES O-34-140.cut.vrt O-34-140.xyz