#!/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 1950.0 2517.0 21 56.333333333333336 -gcp 23703.0 2658.0 21.5 56.333333333333336 -gcp 23604.0 28518.0 21.5 56 -gcp 1668.0 28362.0 21 56 O-34-138_139.jpg O-34-138_139.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1950.0 2517.0\n23703.0 2658.0\n23604.0 28518.0\n1668.0 28362.0" | \
  gdaltransform -tps -output_xy O-34-138_139.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  O-34-138_139.vrt O-34-138_139.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES O-34-138_139.cut.vrt O-34-138_139.xyz