#!/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 447.0 771.0 23 57.333333333333336 -gcp 7512.0 684.0 23.5 57.333333333333336 -gcp 7638.0 9387.0 23.5 57 -gcp 540.0 9450.0 23 57 O-34-107_Engure.jpg O-34-107_Engure.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "447.0 771.0\n7512.0 684.0\n7638.0 9387.0\n540.0 9450.0" | \
  gdaltransform -tps -output_xy O-34-107_Engure.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  O-34-107_Engure.vrt O-34-107_Engure.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES O-34-107_Engure.cut.vrt O-34-107_Engure.xyz