#!/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 996.0 645.0 21.837216666666666 56.5 -gcp 8271.0 633.0 22.337216666666666 56.5 -gcp 8298.0 7215.0 22.337216666666666 56.25 -gcp 975.0 7227.0 21.837216666666666 56.25 lnb/src2/raw/27342203.jpg 27342203.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "996.0 645.0\n8271.0 633.0\n8298.0 7215.0\n975.0 7227.0" | \
  gdaltransform -tps -output_xy 27342203.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  27342203.vrt 27342203.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 27342203.cut.vrt 27342203.xyz