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Data Attributions

Last updated October 2026

The Emrelia E3X presents data from government and open sources. We're grateful to all of them; the notices below are required by their licenses and gladly given.

Map data

  • Base map features and time-zone boundaries © OpenStreetMap contributors, available under the Open Database License (ODbL 1.0).
  • Populated places, country and administrative boundaries, urban-area footprints, lakes, rivers, and marine polygons from Natural Earth (public domain).
  • Airport data from OurAirports (public domain).

United States government sources

Public-domain works of the U.S. Government.

  • FAA: NASR airspace, airport, and navaid data; coded instrument flight procedures (CIFP); communication frequencies; the Digital Obstacle File; VFR charts; IFR enroute charts (low and high); d-TPP terminal procedure plates; the Digital Chart Supplement; and Temporary Flight Restrictions (TFRs).
  • NOAA / National Weather Service: METARs, TAFs, SIGMETs and AIRMETs, PIREPs, winds and temperatures aloft (Aviation Weather Center bulletins and the NCEP GFS model), MRMS precipitation radar and echo tops, and WPC surface analysis.
  • NOAA NCEI: historical surface observations (Global Historical Climatology Network — hourly) and ETOPO 2022 terrain relief.

Canada

  • Weather radar beyond the contiguous United States is served by Environment and Climate Change Canada's MSC GeoMet service, under its open-government licence. Required notice: Data source: Environment and Climate Change Canada.

Terrain

A low-resolution relief backdrop ships with the data packs (NOAA NCEI ETOPO 2022, credited above). Detailed terrain is rendered at runtime from the scenery already installed in the user's own X-Plane; Emrelia does not redistribute that scenery.

Fonts and site software

The typefaces served by this site (Barlow and IBM Plex) are licensed under the SIL Open Font License 1.1 — copyright notices and the full license are on the font licenses page. The site is built with open-source software, including Astro, Starlight, and Pagefind (MIT licensed).

Some derived data stores carry share-alike obligations; see corresponding source.