geometry-proj

Part of the boost_geometry workspace — a Rust port of Boost.Geometry. Most users should depend on the facade crate, which re-exports this one; depend on this crate directly only for a slimmer build.

Coordinate-reference-system reprojection for the geometry kernel.

Boost.Geometry defers projections to its unsupported extensions/gis/projections/; this crate fills the gap with the pure-Rust [proj4rs] engine (no C dependency). Build a [Crs] from a proj4 string, an EPSG code, or a WKT definition, then reproject a geometry from one CRS to another in place.

use geometry_cs::Cartesian;
use geometry_model::Point2D;
use geometry_proj::{reproject, Crs};
use geometry_trait::Point as _;

let wgs84 = Crs::from_epsg(4326).unwrap();      // lon/lat, radians
let mercator = Crs::from_epsg(3857).unwrap();   // metres
let mut p = Point2D::<f64, Cartesian>::new(0.0, 0.0);
reproject(&mut p, &wgs84, &mercator).unwrap();
assert!(p.get::<0>().abs() < 1e-6);

Units

proj4rs carries geographic coordinates in radians; convert with [f64::to_radians] / [f64::to_degrees] at the boundary. See reproject for detail.

Module layout:

• [crs] — the [Crs] type and its constructors.
• reproject — the [ReprojectPoints] hook and the reproject function.

License

BSL-1.0 — see LICENSE.