#!/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 468.0 561.0 26.276666666666667 55.75 -gcp 12393.0 585.0 26.726666666666667 55.75 -gcp 12444.0 12267.0 26.726666666666667 55.5 -gcp 432.0 12267.0 26.276666666666667 55.5 bruno/IX-21_1917.jpg IX-21_1917.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "468.0 561.0\n12393.0 585.0\n12444.0 12267.0\n432.0 12267.0" | \
  gdaltransform -tps -output_xy IX-21_1917.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  IX-21_1917.vrt IX-21_1917.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES IX-21_1917.cut.vrt IX-21_1917.xyz