#!/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 1182.0 1485.0 22 57 -gcp 15351.0 1509.0 22.5 57 -gcp 15357.0 18942.0 22.5 56.666666666666664 -gcp 1038.0 18936.0 22 56.666666666666664 O-34-117.jpg O-34-117.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1182.0 1485.0\n15351.0 1509.0\n15357.0 18942.0\n1038.0 18936.0" | \
  gdaltransform -tps -output_xy O-34-117.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  O-34-117.vrt O-34-117.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES O-34-117.cut.vrt O-34-117.xyz