#!/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 25.12330277 56.25922675 -gcp 21600.0 0.0 25.14580868 56.28593178 -gcp 21600.0 21729.0 25.19615792 56.27364661 -gcp 0.0 21729.0 25.17264139 56.24518015 GX4599/GX_4599_SD_frame_103.jpg GX_4599_SD_frame_103.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "864.0 2760.0\n900.0 19548.0\n21336.0 19800.0\n21372.0 2496.0" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_103.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_103.vrt GX_4599_SD_frame_103.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_103.cut.vrt GX_4599_SD_frame_103.xyz