#!/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 26.37092308 56.09488985 -gcp 21600.0 0.0 26.31962604 56.09567308 -gcp 21600.0 21975.0 26.31919251 56.12583987 -gcp 0.0 21975.0 26.37367765 56.12535254 GX4599/GX_4599_SD_frame_57.jpg GX_4599_SD_frame_57.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "876.0 2873.4545288085938\n872.7275390625 19485.818115234375\n21432.0 19795.63623046875\n21231.2724609375 2491.63623046875" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_57.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_57.vrt GX_4599_SD_frame_57.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_57.cut.vrt GX_4599_SD_frame_57.xyz