#!/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 23.78059387 56.62665801 -gcp 21600.0 0.0 23.71813059 56.61333519 -gcp 21600.0 21912.0 23.69527817 56.64245396 -gcp 0.0 21912.0 23.75896454 56.66442275 GX4596/GX_4596_SD_frame_42.jpg GX_4596_SD_frame_42.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "3024.0 840.0\n2688.0 2208.0\n984.0 2160.0\n744.0 19512.0\n2760.0 19656.0\n2904.0 21192.0\n21360.0 21264.0\n21168.0 3000.0\n17760.0 3048.0\n17520.0 1032.0" | \
  gdaltransform -tps -output_xy GX_4596_SD_frame_42.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4596_SD_frame_42.vrt GX_4596_SD_frame_42.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4596_SD_frame_42.cut.vrt GX_4596_SD_frame_42.xyz