#!/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 927.0 1320.0 25.826666666666668 56.75 -gcp 10668.0 1260.0 26.276666666666667 56.75 -gcp 10788.0 11049.0 26.276666666666667 56.5 -gcp 921.0 11118.0 25.826666666666668 56.5 Bruno/V-20_Kreuzburg.jpg V-20_Kreuzburg.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "927.0 1320.0\n10668.0 1260.0\n10788.0 11049.0\n921.0 11118.0" | \
  gdaltransform -tps -output_xy V-20_Kreuzburg.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  V-20_Kreuzburg.vrt V-20_Kreuzburg.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES V-20_Kreuzburg.cut.vrt V-20_Kreuzburg.xyz