#!/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 2340.0 975.0 20.837216666666666 56.5 -gcp 16821.0 1002.0 21.337216666666666 56.5 -gcp 16839.0 14124.0 21.337216666666666 56.25 -gcp 2280.0 14133.0 20.837216666666666 56.25 bruno/H16_1921_Libau-sud.jpg H16_1921_Libau-sud.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2340.0 975.0\n16821.0 1002.0\n16839.0 14124.0\n2280.0 14133.0" | \
  gdaltransform -tps -output_xy H16_1921_Libau-sud.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  H16_1921_Libau-sud.vrt H16_1921_Libau-sud.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES H16_1921_Libau-sud.cut.vrt H16_1921_Libau-sud.xyz