#!/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 1740.0 585.0 22 55 -gcp 13827.0 597.0 24 55 -gcp 14034.0 11106.0 24 54 -gcp 1668.0 11115.0 22 54 opt_lt/txu-oclc-6519747-nn34-6.jpg txu-oclc-6519747-nn34-6.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1740.0 585.0\n7779.75 631.8752084491384\n13827.0 597.0\n14034.0 11106.0\n7852.875 11151.397720956087\n1668.0 11115.0" | \
  gdaltransform -tps -output_xy txu-oclc-6519747-nn34-6.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  txu-oclc-6519747-nn34-6.vrt txu-oclc-6519747-nn34-6.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES txu-oclc-6519747-nn34-6.cut.vrt txu-oclc-6519747-nn34-6.xyz