#!/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 783.0 534.0 25.826666666666668 56.25 -gcp 12501.0 564.0 26.276666666666667 56.25 -gcp 12528.0 12282.0 26.276666666666667 56 -gcp 720.0 12249.0 25.826666666666668 56 bruno/VII-20_1917.jpg VII-20_1917.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "783.0 534.0\n12501.0 564.0\n12528.0 12282.0\n720.0 12249.0" | \
  gdaltransform -tps -output_xy VII-20_1917.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  VII-20_1917.vrt VII-20_1917.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES VII-20_1917.cut.vrt VII-20_1917.xyz