I3S - Evolution of an OGC 3D Streaming Standard & Adoption in the FOSS Community

I3S is an open format for streaming massive 3D geospatial content. Adopted by Open Geospatial Consortium (OGC), the latest update, I3S OGC 1.3 dramatically improves performance and scalability and supports a new Building Scene Layer type. We’ll review these improvements, including paged node access pattern, a more compact geometry layout, advanced material definitions property, and support for KTX2 compressed textures – reducing compressed texture content size by over 60%. We’ll also outline patterns for distributing I3S content through open-source solutions such as loaders.gl and CesiumJS.