#!/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 25.36861181 56.23536047 -gcp 21600.0 0.0 25.32654405 56.25023502 -gcp 21600.0 21480.0 25.35357481 56.27478611 -gcp 0.0 21480.0 25.39627075 56.25823925 GX1006/GX_1006_SD_frame_179.jpg GX_1006_SD_frame_179.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "876.0 2760.0\n1068.0 19416.0\n21348.0 19284.0\n21516.0 2844.0" | \
  gdaltransform -tps -output_xy GX_1006_SD_frame_179.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_1006_SD_frame_179.vrt GX_1006_SD_frame_179.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_1006_SD_frame_179.cut.vrt GX_1006_SD_frame_179.xyz