#!/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 26.03745818 56.47159995 -gcp 21600.0 0.0 26.00804374 56.44705545 -gcp 21600.0 21792.0 25.96129437 56.46333339 -gcp 0.0 21792.0 25.99155525 56.48950199 GX4599/GX_4599_SD_frame_79.jpg GX_4599_SD_frame_79.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "816.0 3048.0\n864.0 19704.0\n21360.0 20136.0\n21420.0 2808.0" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_79.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_79.vrt GX_4599_SD_frame_79.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_79.cut.vrt GX_4599_SD_frame_79.xyz