What is SLPK?
The I3S (Indexed 3D Scene Layer Specification) originates from Esri. The specification was adopted as a Community Standard by the OGC (Open Geospatial Consortium) in 2017. The I3S specification is for streaming and packaging large heterogenous 3D Geo data. An I3S dataset is also called a Scene Layer. With a Scene Layer Package (SLPK) file, one I3S layer, containing all the data can be exchanged.