#!/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 3909.0 2046.0 23.837216666666666 57 -gcp 25539.0 1974.0 24.337216666666666 57 -gcp 25716.0 21675.0 24.337216666666666 56.75 -gcp 4014.0 21783.0 23.837216666666666 56.75 nr/KdwR-LC_O14_Riga_1917_.jpg KdwR-LC_O14_Riga_1917_.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "3909.0 2046.0\n25539.0 1974.0\n25716.0 21675.0\n4014.0 21783.0" | \
  gdaltransform -tps -output_xy KdwR-LC_O14_Riga_1917_.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  KdwR-LC_O14_Riga_1917_.vrt KdwR-LC_O14_Riga_1917_.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES KdwR-LC_O14_Riga_1917_.cut.vrt KdwR-LC_O14_Riga_1917_.xyz