#!/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 1379.25 1315.599442896936 24.5 57.25 -gcp 11936.625 1404.8068245125348 25 57.25 -gcp 11905.5 11122.578342618384 25 57 -gcp 1260.75 11047.209401114207 24.5 57 47-Sigulda_1940.jpg 47-Sigulda_1940.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"1379.25 1315.599442896936\n11936.625 1404.8068245125348\n11905.5 11122.578342618384\n1260.75 11047.209401114207\" | \
  gdaltransform -tps -output_xy 47-Sigulda_1940.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  47-Sigulda_1940.vrt 47-Sigulda_1940.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 47-Sigulda_1940.cut.vrt 47-Sigulda_1940.xyz