#!/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 25.78951344 56.27356491 -gcp 21600.0 0.0 25.73866596 56.27567854 -gcp 21600.0 21789.0 25.74151036 56.30554924 -gcp 0.0 21789.0 25.79520024 56.30301701 GX4599/GX_4599_SD_frame_139.jpg GX_4599_SD_frame_139.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "792.0 2904.0\n696.0 19536.0\n21312.0 19872.0\n21228.0 2676.0" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_139.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_139.vrt GX_4599_SD_frame_139.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_139.cut.vrt GX_4599_SD_frame_139.xyz