#!/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 969.0 492.0 26.337216666666666 56.25 -gcp 8289.0 498.0 26.837216666666666 56.25 -gcp 8310.0 7053.0 26.837216666666666 56 -gcp 936.0 7047.0 26.337216666666666 56 lnb/src3/raw/27342257.jpg 27342257.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "969.0 492.0\n8289.0 498.0\n8310.0 7053.0\n936.0 7047.0" | \
  gdaltransform -tps -output_xy 27342257.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  27342257.vrt 27342257.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 27342257.cut.vrt 27342257.xyz