#!/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 25.81509233 56.09833909 -gcp 21600.0 0.0 25.85395217 56.11695748 -gcp 21600.0 21975.0 25.89009762 56.09437135 -gcp 0.0 21975.0 25.8481586 56.07535289 GX4599/GX_4599_SD_frame_31.jpg GX_4599_SD_frame_31.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "840.0 2688.0\n720.0 19104.0\n21000.0 19416.0\n21168.0 2880.0" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_31.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_31.vrt GX_4599_SD_frame_31.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_31.cut.vrt GX_4599_SD_frame_31.xyz