#!/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 1851.0 696.0 26 56 -gcp 13656.0 690.0 28 56 -gcp 13887.0 11181.0 28 55 -gcp 1791.0 11220.0 26 55 txu-oclc-6519747-nn35-2.jpg txu-oclc-6519747-nn35-2.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1851.0 696.0\n13656.0 690.0\n13887.0 11181.0\n1791.0 11220.0" | \
  gdaltransform -tps -output_xy txu-oclc-6519747-nn35-2.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  txu-oclc-6519747-nn35-2.vrt txu-oclc-6519747-nn35-2.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES txu-oclc-6519747-nn35-2.cut.vrt txu-oclc-6519747-nn35-2.xyz