#!/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 369.0 897.0 20.876666666666665 56.75 -gcp 12642.0 819.0 21.326666666666668 56.75 -gcp 12825.0 13194.0 21.326666666666668 56.5 -gcp 489.0 13374.0 20.876666666666665 56.5 V-9_Libau_50K_1917_Ge.jpg V-9_Libau_50K_1917_Ge.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "369.0 897.0\n12642.0 819.0\n12825.0 13194.0\n489.0 13374.0" | \
  gdaltransform -tps -output_xy V-9_Libau_50K_1917_Ge.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  V-9_Libau_50K_1917_Ge.vrt V-9_Libau_50K_1917_Ge.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES V-9_Libau_50K_1917_Ge.cut.vrt V-9_Libau_50K_1917_Ge.xyz