#!/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 25.83697915 56.07730482 -gcp 21600.0 0.0 25.87802768 56.09420976 -gcp 21600.0 21975.0 25.91153383 56.07005329 -gcp 0.0 21975.0 25.86725593 56.05265252 GX4599/GX_4599_SD_frame_32.jpg GX_4599_SD_frame_32.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "912.0 3024.0\n876.0 19488.0\n21312.0 19656.0\n21276.0 2604.0" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_32.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_32.vrt GX_4599_SD_frame_32.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_32.cut.vrt GX_4599_SD_frame_32.xyz