#!/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 717.0 1227.0 21.776666666666667 57.25 -gcp 12090.0 1206.0 22.226666666666667 57.25 -gcp 12141.0 12861.0 22.226666666666667 57 -gcp 690.0 12894.0 21.776666666666667 57 III-11_Usmaiten.jpg III-11_Usmaiten.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "717.0 1227.0\n12090.0 1206.0\n12141.0 12861.0\n690.0 12894.0" | \
  gdaltransform -tps -output_xy III-11_Usmaiten.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  III-11_Usmaiten.vrt III-11_Usmaiten.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES III-11_Usmaiten.cut.vrt III-11_Usmaiten.xyz