#!/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 3906.0 4674.0 24 57 -gcp 25416.0 4647.0 24.5 57 -gcp 25545.0 30786.0 24.5 56.666666666666664 -gcp 3831.0 30840.0 24 56.666666666666664 O-35-109.jpg O-35-109.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "3906.0 4674.0\n25416.0 4647.0\n25545.0 30786.0\n3831.0 30840.0" | \
  gdaltransform -tps -output_xy O-35-109.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  O-35-109.vrt O-35-109.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES O-35-109.cut.vrt O-35-109.xyz