google/s2geometry

Health v2 · maintenance only

Adoption not part of the score

2717 stars · 355 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

S2 Geometry is a C++ library (with Python bindings) for computational geometry and spatial indexing on the sphere, representing geographic data on a 3D globe rather than flat map projections. It provides robust spatial indexes, constructive operations like intersection and union, and fast proximity queries over points, polylines, and polygons.

Use cases

• index billions of geographic points for fast nearby queries
• find all points within 100km of a target location
• compute intersections and unions of polygons on the Earth's surface
• build a worldwide geographic database with no seams or singularities
• approximate arbitrary regions as collections of discrete S2 cells for distributed spatial indexes
• test whether a point is contained within a polygon
• measure distances and compute centroids of geographic shapes

When to choose

• you need robust spherical geometry instead of flat 2D map projections
• you are building large-scale geographic or spatial databases
• you need fast in-memory spatial indexing of points, polylines, and polygons
• you need globally consistent spatial indexing without projection distortion or dateline seams
• you want a battle-tested library used extensively on Google's geographic data

When to avoid

• you only need simple planar 2D geometry unrelated to the Earth's surface
• you need ellipsoidal (geodesic) precision, which is orders of magnitude slower
• you require a stable API or ABI - releases are 0.x with no stability guarantees
• you need first-class Windows support or a mature Pythonic API (the SWIG Python interface is unstable)

Facets

library · maturity active

search-engine math geospatial databases developer-tools cpp python cross-platform spherical-geometry spatial-indexing s2-cells geospatial computational-geometry geographic-data maps algorithms linux macos

Member repositories

For agents

markdown · JSON · MCP: product_card(name="google/s2geometry")