#!/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 1815.0 1332.0 24.837216666666666 56.75 -gcp 14778.0 1287.0 25.337216666666666 56.75 -gcp 14868.0 13089.0 25.337216666666666 56.5 -gcp 1836.0 13155.0 24.837216666666666 56.5 bruno/Q15_1917.jpg Q15_1917.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1815.0 1332.0\n14778.0 1287.0\n14868.0 13089.0\n1836.0 13155.0" | \
  gdaltransform -tps -output_xy Q15_1917.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Q15_1917.vrt Q15_1917.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Q15_1917.cut.vrt Q15_1917.xyz