#!/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 24.07413834 56.85946908 -gcp 21600.0 0.0 24.04064239 56.94410343 -gcp 21600.0 22470.0 24.2139448 56.97398872 -gcp 0.0 22470.0 24.25719913 56.8710539 GX2261/GX_2261_SK_frame_7.jpg GX_2261_SK_frame_7.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2592.0 1464.0\n2352.0 20736.0\n16728.0 20880.0\n17208.0 1392.0" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_7.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_7.vrt GX_2261_SK_frame_7.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_7.cut.vrt GX_2261_SK_frame_7.xyz