This is the primary Rust geospatial geometry library (`georust/geo`), providing foundational data types (`Point`, `LineString`, `Polygon`, etc.) via `geo-types` and a comprehensive suite of computational geometry algorithms via the `geo` crate. The library implements OGC Simple Feature Access predicates (`Contains`, `Intersects`, `Covers`, `Within`), DE-9IM topological relationships (`Relate`), boolean operations (union, intersection, difference), convex/concave hulls, triangulation (ear-cutting, constrained Delaunay), simplification (Ramer-Douglas-Peucker, Visvalingam-Whyatt), distance calculations across multiple metric spaces (Euclidean, Haversine, Geodesic, Rhumb), spatial indexing (R-tree, ball tree, interval tree), clustering (DBSCAN, k-means), outlier detection (LOF), polygon repair, and validation. It is a library, not an application—no binary entry points, only examples and benchmarks. The codebase is characterized by a trait-oriented design, heavy use of macros to reduce boilerplate, generic numeric types (`GeoFloat`, `GeoNum`), and a metric-space abstraction that allows algorithms to be reused across coordinate systems. It has extensive test coverage including a JTS (Java Topology Suite) conformance test runner, fuzz testing, and criterion benchmarks. The architecture is modular with clear separation between types, traits, algorithms, and testing infrastructure. While generally well-maintained, some legacy modules (`old_sweep`) and deprecated traits exist, and the boolean operations depend on an external `i_overlay` crate.