#!/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 903.0 654.0 26.837216666666666 56.25 -gcp 8208.0 645.0 27.337216666666666 56.25 -gcp 8250.0 7215.0 27.337216666666666 56 -gcp 903.0 7230.0 26.837216666666666 56 lnb/src3/raw/27342259.jpg 27342259.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "903.0 654.0\n8208.0 645.0\n8250.0 7215.0\n903.0 7230.0" | \
  gdaltransform -tps -output_xy 27342259.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  27342259.vrt 27342259.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 27342259.cut.vrt 27342259.xyz