#!/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 549.0 1173.0 25.5 58 -gcp 6624.0 1176.0 26 58 -gcp 6630.0 8700.0 26 57.666666666666664 -gcp 486.0 8661.0 25.5 57.666666666666664 001/O-35-76.jpg O-35-76.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "549.0 1173.0\n6624.0 1176.0\n6630.0 8700.0\n486.0 8661.0" | \
  gdaltransform -tps -output_xy O-35-76.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  O-35-76.vrt O-35-76.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES O-35-76.cut.vrt O-35-76.xyz