#!/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 1268.25 1271.5554317548747 23 56.75 -gcp 12123.75 1331.4442896935934 23.5 56.75 -gcp 12102.0 11174.410445682452 23.5 56.5 -gcp 1152.75 11108.399582172702 23 56.5 30-Dobele_1937.jpg 30-Dobele_1937.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"1268.25 1271.5554317548747\n12123.75 1331.4442896935934\n12102.0 11174.410445682452\n1152.75 11108.399582172702\" | \
  gdaltransform -tps -output_xy 30-Dobele_1937.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  30-Dobele_1937.vrt 30-Dobele_1937.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 30-Dobele_1937.cut.vrt 30-Dobele_1937.xyz