#!/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 2157.0 4080.0 26 57.333333333333336 -gcp 23349.0 4191.0 26.5 57.333333333333336 -gcp 23298.0 30063.0 26.5 57 -gcp 1905.0 29928.0 26 57 O-35-101.jpg O-35-101.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2157.0 4080.0\n23349.0 4191.0\n23298.0 30063.0\n1905.0 29928.0" | \
  gdaltransform -tps -output_xy O-35-101.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  O-35-101.vrt O-35-101.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES O-35-101.cut.vrt O-35-101.xyz