#!/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 23.93565572 56.85912191 -gcp 21600.0 0.0 23.91714469 56.7720845 -gcp 21600.0 21729.0 23.74078906 56.77537698 -gcp 0.0 21729.0 23.76141731 56.8788193 GX2261/GX_2261_SK_frame_82.jpg GX_2261_SK_frame_82.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2256.0 2640.0\n2064.0 19728.0\n17232.0 19968.0\n17328.0 2448.0" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_82.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_82.vrt GX_2261_SK_frame_82.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_82.cut.vrt GX_2261_SK_frame_82.xyz