#!/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 0.0 0.0 26.989614846694 57.429371054647 -gcp 11622.0 0.0 26.995998694767 57.401772028721 -gcp 11622.0 11973.0 26.943712464832 57.398020238475 -gcp 0.0 11973.0 26.937280336997 57.425856178915 Aluksne-1989-1186/Aluksne-1989-1186-20.jpg Aluksne-1989-1186-20.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2247.0 1086.0\n10575.0 2343.0\n9273.0 10773.0\n936.0 9492.0" | \
  gdaltransform -tps -output_xy Aluksne-1989-1186-20.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Aluksne-1989-1186-20.vrt Aluksne-1989-1186-20.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Aluksne-1989-1186-20.cut.vrt Aluksne-1989-1186-20.xyz