#!/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 27.39824592 56.46339043 -gcp 18003.0 0.0 27.34515403 56.45629918 -gcp 18003.0 18003.0 27.32907928 56.48671207 -gcp 0.0 18003.0 27.38556068 56.49477451 GX18012/GX_18012_SK_frame_42.jpg GX_18012_SK_frame_42.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "3072.0 3024.0\n2640.0 14856.0\n16104.0 15696.0\n16872.0 3456.0" | \
  gdaltransform -tps -output_xy GX_18012_SK_frame_42.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_18012_SK_frame_42.vrt GX_18012_SK_frame_42.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_18012_SK_frame_42.cut.vrt GX_18012_SK_frame_42.xyz