#!/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 2370.0 1101.0 26.837216666666666 56.75 -gcp 14553.0 1107.0 27.337216666666666 56.75 -gcp 14607.0 12174.0 27.337216666666666 56.5 -gcp 2361.0 12180.0 26.837216666666666 56.5 bruno/U15_1917.jpg U15_1917.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2370.0 1101.0\n14553.0 1107.0\n14607.0 12174.0\n2361.0 12180.0" | \
  gdaltransform -tps -output_xy U15_1917.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  U15_1917.vrt U15_1917.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES U15_1917.cut.vrt U15_1917.xyz