#!/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 1917.0 2310.0 24 56.666666666666664 -gcp 23391.0 2481.0 24.5 56.666666666666664 -gcp 23304.0 28281.0 24.5 56.333333333333336 -gcp 1632.0 28110.0 24 56.333333333333336 O-35-121_z.jpg O-35-121_z.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1917.0 2310.0\n23391.0 2481.0\n23304.0 28281.0\n1632.0 28110.0" | \
  gdaltransform -tps -output_xy O-35-121_z.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  O-35-121_z.vrt O-35-121_z.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES O-35-121_z.cut.vrt O-35-121_z.xyz