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Data licences and sources

As of 19 October 2026

Lachez shows a map, airspace, power lines, weather and terrain height. We did not create this data; it comes from open sources. Here you can see where it comes from and under which terms we may use it. The app is free and does not sell the data.

For information only — not a substitute for AIP, AUP or NOTAM. Airspace and obstacles in the app are an aid, not an official source. Activation shown in the app may be incomplete or outdated; always verify in the AUP/NOTAM before flight. An empty area on the map does not mean the airspace is free.

1. Map and power-line layer

The map base and the power-line layer are based on OpenStreetMap data: © OpenStreetMap contributors. The data is available under the Open Database Licence (ODbL). The power-line layer is loaded through the Overpass API. On request we provide the OpenStreetMap extract used for the power-line layer under the ODbL (info@lachez.eu).

2. Airspace

Airspace: © openAIP, licensed under Creative Commons CC BY-NC 4.0. The data was filtered and adapted (height conversion, simplification) for display in the app. The app is free and does not sell the data.

Airspace activations (TSA/TRA and areas not managed by AMC) in the Czech Republic come from the daily AUP/UUP published by Air Navigation Services of the Czech Republic (ŘLP ČR, s.p., aim.rlp.cz), refreshed at most hourly. Airfield data: © openAIP. Links to national AIPs, the Czech VFR Manual, AUP and NOTAM (IBS) open the official sources in your browser; no data is sent to them.

3. Weather and terrain height

Weather (QNH, temperature): METAR from the NOAA Aviation Weather Center.
Terrain height: Open Topo Data (EU-DEM 25 m for Europe, SRTM 30 m and Mapzen terrain tiles; over the sea the water level). SRTM and GMTED2010 data courtesy of the U.S. Geological Survey. Produced using Copernicus data and information funded by the European Union - EU-DEM layers. ETOPO1 data from NOAA NCEI. Further sources: tilezen/joerd, attribution.md.

4. Crew driving time and place names

Crew driving time is calculated by OSRM and place names are provided by Nominatim. Both use data © OpenStreetMap contributors (ODbL).

5. Flight card

6. Libraries

We use the Leaflet map library under the BSD‑2‑Clause licence.

7. Overview

Source	Used for	Licence
OpenStreetMap, Overpass	map, power lines	ODbL
openAIP	airspace	CC BY-NC 4.0
NOAA Aviation Weather Center	METAR (QNH, temperature)	US government data
Open Topo Data (EU-DEM, SRTM, Mapzen terrain)	terrain height	source attributions see section 3
OSRM, Nominatim	driving time, place names	OSM data (ODbL)
Leaflet	map library	BSD‑2‑Clause

As of 19 October 2026. The application and website are operated by Colegio Solutions s.r.o. Send questions about licences to info@lachez.eu.

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