#!/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 1755.0 1347.0 26.337216666666666 56.5 -gcp 12867.0 1320.0 27.337216666666666 56.5 -gcp 13023.0 11106.0 27.337216666666666 56 -gcp 1719.0 11130.0 26.337216666666666 56 lnb/27352339.jpg 27352339.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1755.0 1347.0\n12867.0 1320.0\n13023.0 11106.0\n1719.0 11130.0" | \
  gdaltransform -tps -output_xy 27352339.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  27352339.vrt 27352339.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 27352339.cut.vrt 27352339.xyz