#!/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 1980.0 1270.8601671309193 27 56.75 -gcp 12687.0 1311.8774373259052 27.5 56.75 -gcp 12684.75 11046.142479108636 27.5 56.5 -gcp 1931.25 11012.347771587743 27 56.5 94-Rezekne_1940.jpg 94-Rezekne_1940.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"1980.0 1270.8601671309193\n12687.0 1311.8774373259052\n12684.75 11046.142479108636\n1931.25 11012.347771587743\" | \
  gdaltransform -tps -output_xy 94-Rezekne_1940.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  94-Rezekne_1940.vrt 94-Rezekne_1940.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 94-Rezekne_1940.cut.vrt 94-Rezekne_1940.xyz