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|Definitionskos:definition||This OGC Engineering Report (ER) provides the summary findings resulting from completion of the OGC Vector Tiles Pilot (VTP or Pilot). The requirements for the Pilot were generated from a combination of sponsor input and analysis of typical use cases for tiling of vector feature data across the OGC Standards Baseline and related standards. The driving use case for this activity was the visualization of feature data on a client. The three main scenarios considered were consumption of tiled feature data by a web client, a desktop client and a mobile client. As a standards body, the OGC already has standards that fit these use cases. These are; Web Map Tile Service 1.0 (WMTS) for a web client, and GeoPackage 1.2 for a mobile client. Web Feature Service (WFS) 3.0 is suitable for a desktop client and has an in-built method to support tiling, but not specifically for tiled feature data such as that explored in the VTP. One of the purposes of the Pilot was to produce demonstration implementations to support tiled feature data using WFS 3.0, WMTS 1.0 and GeoPackage 1.2 that can be validated by Technology Integration Experiments (TIEs). The draft extension to these standards helped define a draft Conceptual Model for tiled feature data in support of visualization. The Conceptual Model formally captures the requirements for component implementations and rationalizes them into a model documented in the Unified Modeling Language (UML).The ER provides an overview of each of the components, their implementation decisions and the challenges faced. The components are presented as draft extensions to existing standards. The WFS standard is currently in a major revision cycle and is transitioning away from services to a resource-oriented architecture. This transition has implications for access to tiled feature data. This offers options of access to pre-rendered tiles, or to tiles created using WFS 3.0 query functionality. The current WMTS standard only offers access to the pre-rendered tiles and much of the work is therefore about defining and supporting tiled feature data as a media type. The OGC GeoPackage standard is more complex as it attempts to ship all of the tiled feature data in a self-contained package aimed at environments that have Denied, Degraded, Intermittent or Limited (DDIL) bandwidth. DDIL is an important use case for GeoPackage as most normal web services do not function without connectivity. The military, first responders and other groups who work in challenging operational environments require a capability to ship, store and distribute geospatial data in an efficient, modern manner. The combination of GeoPackage and tiled feature data offers the means to supply detailed geospatial data in a portable fashion to satisfy many DDIL use cases. GeoPackage also offers the majority of the future work as it attempts to store information such as styling and attribution separately to the geometries to take advantage of a relational database structure.When this project was initiated, the term vector tiles was used throughout. However, as the project progressed, the participants agreed that the term tiled feature data was more appropriate than the colloquial term of vector tiles. This engineering report therefore interchangeably uses both tiled feature data and vector tiles to refer to the approach of tiling vector feature data.|
|OGC document typedoctype||Public Engineering Report|