#!/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 4764.0 2496.0 26.837216666666666 57 -gcp 26250.0 2700.0 27.337216666666666 57 -gcp 26196.0 22395.0 27.337216666666666 56.75 -gcp 4587.0 22206.0 26.837216666666666 56.75 nr/KdwR-LC_U14_Iwdini_1919_.jpg KdwR-LC_U14_Iwdini_1919_.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "4764.0 2496.0\n26250.0 2700.0\n26196.0 22395.0\n4587.0 22206.0" | \
  gdaltransform -tps -output_xy KdwR-LC_U14_Iwdini_1919_.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  KdwR-LC_U14_Iwdini_1919_.vrt KdwR-LC_U14_Iwdini_1919_.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES KdwR-LC_U14_Iwdini_1919_.cut.vrt KdwR-LC_U14_Iwdini_1919_.xyz