Abstract
Abstract. The demand of serving large 3D spatial data, mainly of urban areas, reflects the need of hierarchical data structures for 3D data. During the last years the OGC community standard I3S (Indexed 3d Scene Layer, ESRI) and 3D Tiles (Analytical Graphics, Inc.) emerged in order to deal with this challenge. Conceptually, hierarchical structures for 3D data operate similarly to web map tiles, differing only in the implementation. Although 3D hierarchical formats can transmit arbitrary sized geospatial data, they are not interoperable with consuming/visualization technologies on the client. A series of prototype implementations focus on rendering of hierarchical organized massive 3D data in various web client technologies employing the 3D Portrayal Service. As a result, the user can query a scene via the 3D Portrayal Service by specifying a spatial region, rather than a specific resource via a URI. The result is delivered either using I3S or 3D Tiles as a data delivery format, depending on which data is available for the specified region. The client APIs are capable of rendering either the I3S or the 3D Tiles content.
Highlights
The technological pluralism in 3D web visualization constantly increases the need of interoperability
This paper defines an attempt to realize the interoperability between geospatial data web consumers and OGC’s 3D Portrayal Service (Coors et al, 2017) regarding the request of hierarchical 3D data storages. 3D Tiles (3D Tiles Specification, 2018) and I3S (I3S Specification, 2018) are the latest implementations of hierarchical data storages
This is due to the extended 3D Portrayal Service/Cesium implementation, which requests only the mesh geometry and the face normals from an I3S node, whereas the ArcGIS JavaScript API requests shared resources, i.e., material definitions and textures
Summary
The technological pluralism in 3D web visualization constantly increases the need of interoperability. This paper defines an attempt to realize the interoperability between geospatial data web consumers (web globes) and OGC’s 3D Portrayal Service (Coors et al, 2017) regarding the request of hierarchical 3D data storages. OGC Testbed 13 focuses on the overall architecture developed in the "Interoperability of 3D Tiles and I3S using a 3D Portrayal Service and performance study of 3D tiling algorithms" activity. It summarizes a proof-of-concept of the use of 3D Tiles and I3S as data delivery formats for the OGC 3D Portrayal Service interface standard. The present study gives an insight into OGC’s Testbed 13 experiments 2 and 3 which relate to 3D Portrayal Service interoperability capabilities
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