Open data

Every year Updraft publishes the aggregate layers it derives from the flights of consenting pilots as open data: the thermal grid, approved take-offs and landings, hazards and skyways. The files are GeoParquet and GeoJSON; no account or key is needed.

What the package does not contain

Nothing that can point to a person: no pilots, flights, tracks, dates or timestamps, pilot counts or identity hashes.
No cell or place below a privacy threshold: every value has at least the threshold's number of different pilots behind it on the release day.
No exact counts: support is given only as a level (at least how many pilots); there is no combined month and hour breakdown and no wind breakdown.
No objects imported from OpenStreetMap or other sources; only data derived from flights and approved by moderators.

How the layers are made and which sources they use: About, attribution and licences

Licence and attribution

The package is open under the Creative Commons Attribution 4.0 International licence: you may copy, share and adapt it, commercially too, as long as you show the credit line. Licence: CC BY 4.0 (full text)

The elevation, slope and heading fields of take-offs are derived from Copernicus GLO-30 elevation data; where those fields are used, the official notice below is kept as well:

No package published yet

Download links per year will appear here once the first package is published.

Checking a downloaded file

Compute the file's SHA-256 and compare it with the value in the table; if they match, the file is complete and unchanged. On Windows: certutil -hashfile sites.geojson SHA256

sha256sum sites.geojson