#!/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 1563.0 930.0 25.837216666666666 56.75 -gcp 16119.0 918.0 26.337216666666666 56.75 -gcp 16164.0 14148.0 26.337216666666666 56.5 -gcp 1527.0 14163.0 25.837216666666666 56.5 bruno/S15_Kreuzburg.jpg S15_Kreuzburg.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1563.0 930.0\n16119.0 918.0\n16164.0 14148.0\n1527.0 14163.0" | \
  gdaltransform -tps -output_xy S15_Kreuzburg.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  S15_Kreuzburg.vrt S15_Kreuzburg.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES S15_Kreuzburg.cut.vrt S15_Kreuzburg.xyz