#!/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 0.0 0.0 25.794546 56.23284565 -gcp 21600.0 0.0 25.74366679 56.2342929 -gcp 21600.0 22038.0 25.74511535 56.26433066 -gcp 0.0 22038.0 25.79870879 56.26288294 GX4599/GX_4599_SD_frame_137.jpg GX_4599_SD_frame_137.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "528.0 3072.0\n600.0 19728.0\n21240.0 19992.0\n21276.0 2904.0" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_137.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_137.vrt GX_4599_SD_frame_137.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_137.cut.vrt GX_4599_SD_frame_137.xyz