#!/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 1854.0 627.0 20 56 -gcp 13644.0 624.0 22 56 -gcp 13854.0 11100.0 22 55 -gcp 1782.0 11121.0 20 55 opt_lt/txu-oclc-6519747-nn34-2.jpg txu-oclc-6519747-nn34-2.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1854.0 627.0\n7747.5 666.0225125069483\n13644.0 624.0\n13854.0 11100.0\n7818.75 11156.275430794885\n1782.0 11121.0" | \
  gdaltransform -tps -output_xy txu-oclc-6519747-nn34-2.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  txu-oclc-6519747-nn34-2.vrt txu-oclc-6519747-nn34-2.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES txu-oclc-6519747-nn34-2.cut.vrt txu-oclc-6519747-nn34-2.xyz