#!/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 1227.0 645.0 20.837216666666666 57 -gcp 8376.0 672.0 21.337216666666666 57 -gcp 8391.0 7233.0 21.337216666666666 56.75 -gcp 1179.0 7209.0 20.837216666666666 56.75 lnb/src1/raw/27342266.jpg 27342266.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1227.0 645.0\n8376.0 672.0\n8391.0 7233.0\n1179.0 7209.0" | \
  gdaltransform -tps -output_xy 27342266.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  27342266.vrt 27342266.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 27342266.cut.vrt 27342266.xyz