#!/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 306.0 624.0 25.837216666666666 56.5 -gcp 7599.0 630.0 26.337216666666666 56.5 -gcp 7680.0 26793.0 26.337216666666666 55.5 -gcp 222.0 26793.0 25.837216666666666 55.5 lnb/src1/raw/27342326.jpg 27342326.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "306.0 624.0\n7599.0 630.0\n7680.0 26793.0\n222.0 26793.0" | \
  gdaltransform -tps -output_xy 27342326.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  27342326.vrt 27342326.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 27342326.cut.vrt 27342326.xyz