STGeometry

STGeometry is a software library designed to provide robust support for spatial-temporal geometry computations. It offers representations for geometric primitives in two and three dimensions, with an optional time component to model changes over time. The core objects include Point, LineString, Polygon, and their 3D counterparts, which can carry timestamps or valid time intervals.

The library implements a suite of geometric predicates and operations, including intersects, contains, within, and touches, as well as boolean operations such as union, intersection, and difference for polygonal regions. It provides measurement tools for length, area, and volume, along with distance calculations and topological consistency checks. Coordinate reference systems and projections are supported, with mechanisms for transforming geometries between CRS, including optional time-aware queries.

Architecturally, STGeometry is modular, comprising a core geometry engine, an indexing and query layer (using spatial indexes like R-trees), and language bindings for common hosts such as Python and JavaScript. The design emphasizes robustness, numerical stability, and thread-safety, with pluggable backends for coordinate storage and arithmetic.

Common use cases include geographic information systems, computer-aided design, robotics simulation, and augmented reality applications where both spatial relationships and temporal evolution are relevant.

STGeometry is distributed as an open-source project under a permissive license and is available through major code hosting platforms, with documentation and examples to assist integration and development.