#!/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 24.24797526 56.63536874 -gcp 21600.0 0.0 24.21826664 56.72187936 -gcp 21600.0 21849.0 24.3860242 56.74654478 -gcp 0.0 21849.0 24.42544304 56.64765476 GX2261/GX_2261_SK_frame_126.jpg GX_2261_SK_frame_126.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1920.0 2400.0\n1968.0 19656.0\n17448.0 19392.0\n17016.0 2496.0" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_126.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_126.vrt GX_2261_SK_frame_126.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_126.cut.vrt GX_2261_SK_frame_126.xyz