#!/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 2818.428773195684 2195.7261585874367 25.54207832 56.21736037 -gcp 18654.49641054445 3236.8282001272237 25.57082087 56.23240129 -gcp 18964.04026374273 18571.75428940752 25.59857905 56.21902342 -gcp 2903.309293925423 15922.715762914175 25.56746811 56.20411107 GX4599/GX_4599_SD_frame_21_copy.jpg GX_4599_SD_frame_21_copy.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1248.0 2688.2406685236774\n21168.0 2831.3047353760444\n21168.0 19919.83955431755\n1296.0 19295.919777158775" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_21_copy.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_21_copy.vrt GX_4599_SD_frame_21_copy.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_21_copy.cut.vrt GX_4599_SD_frame_21_copy.xyz