Stonn

Stonn is a federated civil viewer designed for surveyors, civil designers, and infrastructure teams to bring together multiple geospatial and infrastructure data formats into a single, unified scene. 3 infrastructure models, GeoJSON parcels, and TopoJSON boundaries without requiring file conversions, plug-ins, or complex licensing arrangements. The platform is built to help teams collaborate by holding all surfaces, structures, parcels, and utilities in one coordinate system and scene, enabling direct reading from each supported source format.

e57). The viewer automatically aligns all imported data to a common coordinate reference system (CRS) and maintains live links to the original source files. Stonn also offers out-of-core streaming and a level-of-detail scene graph, enabling responsive interaction with very large models and datasets that exceed system memory limits.

sff), which packages all source data, coordinate setups, and project state into a single file for easy sharing and handoff. Markup and issue tracking capabilities are built in, allowing users to pin comments to features such as manholes, parcels, boundaries, or alignments, with these annotations persisting within the project layer. 0 and is designed with a civil-native object model, letting users interact with domain-specific elements like alignments, parcels, and pipes directly.

Stonn is available for macOS, Windows, Linux, and WebGL. It is free for individuals and small teams, while enterprise users can opt for a self-hosted federated server. L. and emphasizes open file readers, open coordinate systems, and the absence of vendor lock-in.