#!/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 24.44447301 56.70479744 -gcp 21600.0 0.0 24.41920896 56.61900735 -gcp 21600.0 22038.0 24.2412052 56.62696028 -gcp 0.0 22038.0 24.26973609 56.72846133 GX2261/GX_2261_SK_frame_147.jpg GX_2261_SK_frame_147.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1512.0 2640.0\n1392.0 19512.0\n17304.0 19920.0\n17304.0 2976.0" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_147.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_147.vrt GX_2261_SK_frame_147.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_147.cut.vrt GX_2261_SK_frame_147.xyz