https://github.com/ciscorn/geocentric-rs

Conversion between geodetic (geographic) coordinates and geocentric (cartesian) coordinates in Rust
https://github.com/ciscorn/geocentric-rs

3d coordinates earth geodesy geography geospatial science

Last synced: 5 months ago
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Conversion between geodetic (geographic) coordinates and geocentric (cartesian) coordinates in Rust

• Host: GitHub
• URL: https://github.com/ciscorn/geocentric-rs
• Owner: ciscorn
• License: mit
• Created: 2025-03-08T07:32:56.000Z (7 months ago)
• Default Branch: main
• Last Pushed: 2025-03-10T05:45:20.000Z (7 months ago)
• Last Synced: 2025-04-30T19:07:16.388Z (5 months ago)
• Topics: 3d, coordinates, earth, geodesy, geography, geospatial, science
• Language: Rust
• Homepage: https://crates.io/crates/geocentric
• Size: 5.86 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.txt

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README

          
# geocentric-rs

[![Test](https://github.com/MIERUNE/geocentric-rs/actions/workflows/Test.yml/badge.svg)](https://github.com/MIERUNE/geocentric-rs/actions/workflows/Test.yml)

[![codecov](https://codecov.io/gh/MIERUNE/geocentric-rs/graph/badge.svg?token=zWu8h2egPG)](https://codecov.io/gh/MIERUNE/geocentric-rs)

Conversion between geodetic (geographic) coordinates and geocentric (cartesian) coordinates in Rust.

Keywords: EPSG:4326, EPSG:4979, EPSG:4978

## Usage

```rust

// WGS 84 Ellipsoid

let a = 6378137.; // Semi-major axis

let inv_f = 298.257223563; // Inverse flattening

let f = 1. / inv_f; // Flattening

let e_sq = f * (2. - f); // Eccentricity squared

// Convert from geodetic to geocentric

let (x, y, z) = geodetic_to_geocentric(a, e_sq, 140., 37., 50.);

// Convert from geocentric to geodetic

let (lng, lat, height) = geocentric_to_geodetic(a, e_sq, x, y, z);

```

## References

The `geocentric_to_geodetic` function implements the algorithm described in:

- Hugues Vermeille, *"An analytical method to transform geocentric into geodetic coordinates"*, Journal of Geodesy (2011) 85, pages 105-117. [DOI:10.1007/s00190-010-0419-x](https://doi.org/10.1007/s00190-010-0419-x)

## License

MIT

## Author

Taku Fukada ([@ciscorn](https://github.com/ciscorn))