#!/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 4431.0 2061.0 20.837216666666666 56.75 -gcp 26169.0 2238.0 21.337216666666666 56.75 -gcp 26139.0 21954.0 21.337216666666666 56.5 -gcp 4239.0 21765.0 20.837216666666666 56.5 nr/KdwR-LC_H15_Libau_Nord.jpg KdwR-LC_H15_Libau_Nord.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "4431.0 2061.0\n26169.0 2238.0\n26139.0 21954.0\n4239.0 21765.0" | \
  gdaltransform -tps -output_xy KdwR-LC_H15_Libau_Nord.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  KdwR-LC_H15_Libau_Nord.vrt KdwR-LC_H15_Libau_Nord.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES KdwR-LC_H15_Libau_Nord.cut.vrt KdwR-LC_H15_Libau_Nord.xyz