#!/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 831.0 588.0 27 56.5 -gcp 17181.0 561.0 27.75 56.5 -gcp 17193.0 20292.0 27.75 56 -gcp 609.0 20307.0 27 56 lnb/24837142.jpg 24837142.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "831.0 588.0\n17181.0 561.0\n17193.0 20292.0\n609.0 20307.0" | \
  gdaltransform -tps -output_xy 24837142.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  24837142.vrt 24837142.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 24837142.cut.vrt 24837142.xyz