#!/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 621.0 1572.0 22.676666666666666 57 -gcp 25665.0 1770.0 23.126666666666665 57 -gcp 25746.0 27117.0 23.126666666666665 56.75 -gcp 498.0 27126.0 22.676666666666666 56.75 IV-13_Samiten.jpg IV-13_Samiten.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "621.0 1572.0\n25665.0 1770.0\n25746.0 27117.0\n498.0 27126.0" | \
  gdaltransform -tps -output_xy IV-13_Samiten.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  IV-13_Samiten.vrt IV-13_Samiten.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES IV-13_Samiten.cut.vrt IV-13_Samiten.xyz