This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

Following sources have been used:

• SRTM-1 global elevation data from https://lpdaac.usgs.gov/products/srtmgl1v003/
• Landcover Data from https://land.copernicus.eu/pan-european/corine-land-cover/clc2018 -> Scenery produced with funding by the European Union
• Landcover Data from https://www.openstreetmap.org/export and https://osmdata.openstreetmap.de/data/land-polygons.html under ODbL 1.0
• Airport Data from https://gateway.x-plane.com
• Objects from FlightGear's terrasync (see scenery.flightgear.org)

Thanks to laserman for scripts to process airport data files into groundnets (https://github.com/mherweg/d-laser-fgtools)!

For the developments files, please see https://github.com/D-ECHO/Crete-dev