#!/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 630.0 690.0 26.833333333333332 56.333333333333336 -gcp 5403.0 711.0 27.5 56.333333333333336 -gcp 5415.0 5079.0 27.5 56 -gcp 600.0 5046.0 26.833333333333332 56 2_izdevums/52_Somerseta.jpg 52_Somerseta.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "630.0 690.0\n5403.0 711.0\n5415.0 5079.0\n600.0 5046.0" | \
  gdaltransform -tps -output_xy 52_Somerseta.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  52_Somerseta.vrt 52_Somerseta.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 52_Somerseta.cut.vrt 52_Somerseta.xyz