#!/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 1995.0 1413.0 26.337216666666666 57 -gcp 12960.0 1377.0 27.337216666666666 57 -gcp 13014.0 11322.0 27.337216666666666 56.5 -gcp 1959.0 11325.0 26.337216666666666 56.5 lnb/27352337.jpg 27352337.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1995.0 1413.0\n12960.0 1377.0\n13014.0 11322.0\n1959.0 11325.0" | \
  gdaltransform -tps -output_xy 27352337.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  27352337.vrt 27352337.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 27352337.cut.vrt 27352337.xyz