#!/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 23.69112626 56.56668783 -gcp 21600.0 0.0 23.71887058 56.65048197 -gcp 21600.0 22224.0 23.89442723 56.64879853 -gcp 0.0 22224.0 23.8845821 56.53626831 GX2261/GX_2261_SK_frame_157.jpg GX_2261_SK_frame_157.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1776.0 2808.0\n1728.0 19920.0\n17352.0 19728.0\n17424.0 2952.0" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_157.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_157.vrt GX_2261_SK_frame_157.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_157.cut.vrt GX_2261_SK_frame_157.xyz