#!/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 0.0 0.0 21.444840431213 56.640017435833 -gcp 10500.0 0.0 21.446900367737 56.613146261867 -gcp 10500.0 12408.0 21.389425992966 56.611611200461 -gcp 0.0 12408.0 21.387022733688 56.638577866847 Aizpute-1988-991/Aizpute-1988-991-88.jpg Aizpute-1988-991-88.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "504.0 936.0\n10398.0 1110.0\n10215.0 11010.0\n321.0 10824.0" | \
  gdaltransform -tps -output_xy Aizpute-1988-991-88.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Aizpute-1988-991-88.vrt Aizpute-1988-991-88.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Aizpute-1988-991-88.cut.vrt Aizpute-1988-991-88.xyz