#!/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 22.63536572 56.63730345 -gcp 21600.0 0.0 22.64639497 56.65846737 -gcp 21600.0 21729.0 22.68462181 56.65290031 -gcp 0.0 21729.0 22.67498732 56.63104873 GX4596/GX_4596_SD_frame_54.jpg GX_4596_SD_frame_54.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "18054.0 3078.0\n17994.0 978.0\n2907.0 822.0\n2880.0 2202.0\n1260.0 2208.0\n1020.0 19560.0\n3048.0 19656.0\n3000.0 21336.0\n21597.0 21264.0\n21597.0 3024.0" | \
  gdaltransform -tps -output_xy GX_4596_SD_frame_54.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4596_SD_frame_54.vrt GX_4596_SD_frame_54.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4596_SD_frame_54.cut.vrt GX_4596_SD_frame_54.xyz