Indexed 3D Scene Layers
An open specification for streaming and distributing large volumes of 3D geographic data across web, mobile, and cloud platforms.
What is Indexed 3D Scene Layers?
I3S (Indexed 3D Scene Layer) is an open specification that defines a format for streaming and distributing large volumes of 3D geographic data. It solves the problem of efficiently visualizing complex 3D scenes—such as buildings, terrain meshes, and point clouds—across web, mobile, and cloud platforms. The specification includes both a delivery format (I3S) and a persistence model (SLPK) to handle arbitrarily large datasets.
Geospatial developers, GIS professionals, and organizations working with 3D mapping, urban planning, drone imagery, or LiDAR data who need to stream and visualize large 3D datasets across multiple platforms.
Developers choose I3S because it's an open, OGC-approved standard designed specifically for high-performance 3D geospatial streaming, with native support for web and cloud environments. Its declarative JSON/REST-based approach ensures broad interoperability and ease of integration compared to proprietary formats.
Overview
This repository hosts the specification for Scene Layers which are containers for arbitrarily large amounts of geographic data. The delivery and persistence model for Scene Layers, referred to as Indexed 3d Scene Layer (I3S) and Scene Layer Package (SLPK) respectively, are specified.
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