#!/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 26.2067163 56.31970213 -gcp 21600.0 0.0 26.15549314 56.31670077 -gcp 21600.0 21792.0 26.14741622 56.34747626 -gcp 0.0 21792.0 26.20361349 56.35119588 GX4599/GX_4599_SD_frame_70.jpg GX_4599_SD_frame_70.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "828.0 2700.0\n864.0 19560.0\n21432.0 19992.0\n21444.0 2532.0" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_70.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_70.vrt GX_4599_SD_frame_70.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_70.cut.vrt GX_4599_SD_frame_70.xyz