Purpose Best Practices | OGC

2 © 2015 Open Geospatial Consortium For devices such as Radars, a geometric representation of a model may often provide a level of fidelity which is insufficient or inappropriate for use in simulation or alternately, it may not be feasible to compute a radar cross-section RCS of the model in real-time. Alternately, a user may wish to incorporate real-world RCS data into the simulator client-devices in order to further improve simulation fidelity. To this end, the CDB Specification defines a RCS Radar Cross- Section model representation for use by Sensor Simulation client-devices such as Radar andor Sonar. Chapter 7, CDB Radar Cross Section RCS Models establishes a set of conventions that permit RCS representations using the Shapefile format. The CDB Specification relies heavily on five established industry formats, namely the TIFF format Appendix B, the OpenFlight format Appendix C, the RGB format Appendix P, the Shapefile format Appendix D and the JPEG 2000 file format Appendix T. These Specifications have been included as appendices to this Specification. Each of these documents has been annotated to reflect the conventions established by the CDB Specification. The conventions define how TIFF, OpenFlight, RGB, Shapefile and JPEG 2000 formatted files are to be interpreted by CDB-compliant simulator readers. Appendices E and F provide the CDB light type naming hierarchy and the CDB model component hierarchies respectively while Appendix L provides the material list for the CDB Specification. Other Appendices further describes other aspects of the CDB Specifications like providing the CDB Directory Naming and Structure Appendix M, the mapping of FACC Codes Appendix N, the List of Texture Component Selectors Appendix O, the SGI Image File Format Appendix P, the Table of Dataset Codes Appendix Q or how some datasets are derived from others Appendix R.

1.3 Scope

The Specification defines an earth synthetic environment data model and the representation, organization, storage structure and conventions necessary to support all of the subsystems of a full-mission simulator. The Specification makes use of several commercial and simulation data formats endorsed by leaders of the database tools industry. The CDB synthetic environment is a representation of the natural environment including external features such as man-made structures and systems. It encompasses the terrain relief, terrain imagery, three-dimensional 3D models of natural and man-made cultural features, 3D models of vehicles, the ocean surface, and the ocean bottom, including features both natural and man- made on the ocean floor. In addition, the synthetic environment includes the specific attributes of the synthetic environment data as well as their relationships. A database that conforms to the CDB Specification i.e., a CDB contains datasets organized in layers, tiles and levels-of-detail; together, these datasets represent the features and models of a synthetic environment for the purposes of distributed simulation applications. The organization of the synthetic environmental data in a CDB is specifically tailored for real-time applications.