#!/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 3603.0 2751.0 26.337216666666666 56.75 -gcp 25284.0 2739.0 26.837216666666666 56.75 -gcp 25428.0 22470.0 26.837216666666666 56.5 -gcp 3603.0 22479.0 26.337216666666666 56.5 nr/KdwR-LC_T15_Warklany_1917_.jpg KdwR-LC_T15_Warklany_1917_.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "3603.0 2751.0\n25284.0 2739.0\n25428.0 22470.0\n3603.0 22479.0" | \
  gdaltransform -tps -output_xy KdwR-LC_T15_Warklany_1917_.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  KdwR-LC_T15_Warklany_1917_.vrt KdwR-LC_T15_Warklany_1917_.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES KdwR-LC_T15_Warklany_1917_.cut.vrt KdwR-LC_T15_Warklany_1917_.xyz