#!/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 1560.0 1203.0 26.837216666666666 56.5 -gcp 14451.0 1101.0 27.337216666666666 56.5 -gcp 14583.0 12705.0 27.337216666666666 56.25 -gcp 1608.0 12789.0 26.837216666666666 56.25 bruno/U16_1917.jpg U16_1917.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1560.0 1203.0\n14451.0 1101.0\n14583.0 12705.0\n1608.0 12789.0" | \
  gdaltransform -tps -output_xy U16_1917.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  U16_1917.vrt U16_1917.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES U16_1917.cut.vrt U16_1917.xyz