#!/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 2055.0 1458.0 25.337216666666666 57 -gcp 12981.0 1404.0 26.337216666666666 57 -gcp 13080.0 11337.0 26.337216666666666 56.5 -gcp 2052.0 11424.0 25.337216666666666 56.5 lnb/27352332.jpg 27352332.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2055.0 1458.0\n12981.0 1404.0\n13080.0 11337.0\n2052.0 11424.0" | \
  gdaltransform -tps -output_xy 27352332.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  27352332.vrt 27352332.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 27352332.cut.vrt 27352332.xyz