#!/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 4020.0 1812.0 26.837216666666666 57.25 -gcp 25320.0 1647.0 27.337216666666666 57.25 -gcp 25626.0 21324.0 27.337216666666666 57 -gcp 4158.0 21519.0 26.837216666666666 57 bruno/U13_1918.jpg U13_1918.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "4020.0 1812.0\n25320.0 1647.0\n25626.0 21324.0\n4158.0 21519.0" | \
  gdaltransform -tps -output_xy U13_1918.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  U13_1918.vrt U13_1918.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES U13_1918.cut.vrt U13_1918.xyz