#!/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 297.0 417.0 20.966666666666665 56.333333333333336 -gcp 5775.0 420.0 21.5 56.333333333333336 -gcp 5811.0 6594.0 21.5 56 -gcp 288.0 6603.0 20.966666666666665 56 001/O-34-138_139.jpg O-34-138_139.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "633.0 3516.7374930516953\n286.5 3519.0050027793213\n297.0 417.0\n5775.0 420.0\n5811.0 6594.0\n630.0 6607.502501389661" | \
  gdaltransform -tps -output_xy O-34-138_139.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  O-34-138_139.vrt O-34-138_139.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES O-34-138_139.cut.vrt O-34-138_139.xyz