#!/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 450.0 1077.0 25.226666666666667 57 -gcp 7797.0 1041.0 25.376666666666665 57 -gcp 7851.0 8577.0 25.376666666666665 56.916666666666664 -gcp 456.0 8634.0 25.226666666666667 56.916666666666664 115_Jurgensburg_April_1917.jpg 115_Jurgensburg_April_1917.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "450.0 1077.0\n7797.0 1041.0\n7851.0 8577.0\n456.0 8634.0" | \
  gdaltransform -tps -output_xy 115_Jurgensburg_April_1917.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  115_Jurgensburg_April_1917.vrt 115_Jurgensburg_April_1917.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 115_Jurgensburg_April_1917.cut.vrt 115_Jurgensburg_April_1917.xyz