#!/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 546.0 1386.0 25 58 -gcp 6378.0 1338.0 25.5 58 -gcp 6432.0 8814.0 25.5 57.666666666666664 -gcp 537.0 8829.0 25 57.666666666666664 001/O-35-75.jpg O-35-75.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "546.0 1386.0\n6378.0 1338.0\n6432.0 8814.0\n537.0 8829.0" | \
  gdaltransform -tps -output_xy O-35-75.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  O-35-75.vrt O-35-75.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES O-35-75.cut.vrt O-35-75.xyz