#!/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 1050.0 351.0 25.837216666666666 55.75 -gcp 12183.0 489.0 26.337216666666666 55.75 -gcp 12084.0 10278.0 26.337216666666666 55.5 -gcp 879.0 10125.0 25.837216666666666 55.5 bruno/Lietuva/S19_1917.jpg S19_1917.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1050.0 351.0\n12183.0 489.0\n12084.0 10278.0\n879.0 10125.0" | \
  gdaltransform -tps -output_xy S19_1917.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  S19_1917.vrt S19_1917.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES S19_1917.cut.vrt S19_1917.xyz