# icao-isa

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An implementation of the [International Civil Aviation Organization](https://icao.int/) (ICAO) [International Standard Atmosphere](https://en.wikipedia.org/wiki/International_Standard_Atmosphere) (ISA), see [ICAO Doc 7488/3](https://standart.aero/en/icao/book/doc-7488-manual-of-the-icao-standard-atmosphere-extended-to-80-kilometres-262-500-feet-en-cons).

The library also includes functions for calculating:

- true airspeed ([TAS](https://en.wikipedia.org/wiki/True_airspeed)) from calibrated airspeed ([CAS](https://en.wikipedia.org/wiki/Calibrated_airspeed)), pressure and temperature;
- CAS from TAS, pressure and temperature;
- TAS from [Mach number](https://en.wikipedia.org/wiki/Mach_number) and temperature;
- and the crossover altitude between CAS / Mach flight regimes.

The equations for the functions above are from [BADA User Manual revision 3-12](https://www.scribd.com/document/289480324/1-User-Manual-Bada-3-12).

The library is declared [no_std](https://docs.rust-embedded.org/book/intro/no-std.html)
so it can be used in embedded applications.

## Contribution

If you want to contribute through code or documentation, the [Contributing](CONTRIBUTING.md) guide is the best place to start.  
Just please abide by our [Code of Conduct](CODE_OF_CONDUCT.md).

## License

`icao-isa-rs` is provided under a MIT license, see [LICENSE](LICENSE).