#!/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 1355.25 1329.1491643454037 24 57 -gcp 11986.5 1315.7557103064069 24.5 57 -gcp 12057.0 11045.07242339833 24.5 56.75 -gcp 1342.5 11057.409610027855 24 56.75 39-Riga_1940.jpg 39-Riga_1940.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"1355.25 1329.1491643454037\n11986.5 1315.7557103064069\n12057.0 11045.07242339833\n1342.5 11057.409610027855\" | \
  gdaltransform -tps -output_xy 39-Riga_1940.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  39-Riga_1940.vrt 39-Riga_1940.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 39-Riga_1940.cut.vrt 39-Riga_1940.xyz