#!/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 1392.0 1461.1391364902506 23 57 -gcp 12189.0 1555.024512534819 23.5 57 -gcp 12106.328380587216 11385.20581866887 23.5 56.75 -gcp 1257.0 11292.04094707521 23 56.75 29-Tukums_1940.jpg 29-Tukums_1940.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"1392.0 1461.1391364902506\n12189.0 1555.024512534819\n12106.328380587216 11385.20581866887\n1257.0 11292.04094707521\" | \
  gdaltransform -tps -output_xy 29-Tukums_1940.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  29-Tukums_1940.vrt 29-Tukums_1940.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 29-Tukums_1940.cut.vrt 29-Tukums_1940.xyz