#!/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 1557.0 909.0 26.337216666666666 57.25 -gcp 15900.0 915.0 26.837216666666666 57.25 -gcp 15948.0 14148.0 26.837216666666666 57 -gcp 1491.0 14148.0 26.337216666666666 57 bruno/T13_1915_Alt-Schweneburg.jpg T13_1915_Alt-Schweneburg.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1557.0 909.0\n15900.0 915.0\n15948.0 14148.0\n1491.0 14148.0" | \
  gdaltransform -tps -output_xy T13_1915_Alt-Schweneburg.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  T13_1915_Alt-Schweneburg.vrt T13_1915_Alt-Schweneburg.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES T13_1915_Alt-Schweneburg.cut.vrt T13_1915_Alt-Schweneburg.xyz