#!/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 1533.0 1407.0 20 56.666666666666664 -gcp 22851.0 1365.0 22 56.666666666666664 -gcp 23088.0 14709.0 22 56 -gcp 1401.0 14736.0 20 56 lnb/24635488.jpg 24635488.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1533.0 1407.0\n11997.0 1452.0366870483601\n22851.0 1365.0\n23088.0 14709.0\n12033.0 14818.503335186215\n1401.0 14736.0" | \
  gdaltransform -tps -output_xy 24635488.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  24635488.vrt 24635488.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 24635488.cut.vrt 24635488.xyz