#!/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 1857.0 840.0 26.837216666666666 56 -gcp 12948.0 765.0 27.337216666666666 56 -gcp 13050.0 10629.0 27.337216666666666 55.75 -gcp 1881.0 10719.0 26.837216666666666 55.75 bruno/U18 1921.jpg U18 1921.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1857.0 840.0\n12948.0 765.0\n13050.0 10629.0\n1881.0 10719.0" | \
  gdaltransform -tps -output_xy U18 1921.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  U18 1921.vrt U18 1921.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES U18 1921.cut.vrt U18 1921.xyz