#!/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 26.38049955 56.07778657 -gcp 21600.0 0.0 26.32852795 56.07598671 -gcp 21600.0 21975.0 26.32401885 56.1061834 -gcp 0.0 21975.0 26.37798399 56.10823955 GX4599/GX_4599_SD_frame_56.jpg GX_4599_SD_frame_56.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "916.36376953125 3122.181884765625\n1107.2728271484375 19841.454345703125\n21432.0 19813.09130859375\n21393.818115234375 2625.8182067871094" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_56.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_56.vrt GX_4599_SD_frame_56.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_56.cut.vrt GX_4599_SD_frame_56.xyz