# Licenses

| Folder          | Source                     | License                                   |
|-----------------|----------------------------|-------------------------------------------|
| `trajectories/` | OpenSky Network (Trino)    | OpenSky Network Data License Agreement — non-profit research/education only. Redistributed with written permission of the OpenSky Network. (https://opensky-network.org/about/terms-of-use) |
| `splits/`       | Own work                   | CC BY 4.0                                 |
| `terrain/`      | Copernicus DEM GLO-90, retrieved via the Copernicus Data Space Ecosystem Sentinel Hub Process API (`demInstance: COPERNICUS_90`) | Full, Free & Open licence for the Copernicus WorldDEM-90 (https://opencamphq.com/attribution) |
| `runways/`      | X-Plane Scenery Gateway    | GNU GPL v2 (https://xpguard.net/licenses)                              |
| `osm/`          | OpenStreetMap contributors | ODbL 1.0 (https://www.openstreetmap.org/copyright/)                    |
| `procedures/`   | AIRAC API (airac.net)      | no license listed. |

## Required notices
- Cite: Schäfer et al., "Bringing up OpenSky: A large-scale ADS-B sensor network for research", IPSN 2014.
- Produced using Copernicus WorldDEM-90 © DLR e.V. 2010-2014 and © Airbus Defence and Space GmbH 2014-2018 provided under COPERNICUS by the European Union and ESA; all rights reserved.
- The organisations in charge of the Copernicus programme by law or by delegation do not incur any liability for any use of the Copernicus WorldDEM-90.
- © OpenStreetMap contributors, available under the Open Database License (ODbL).