Model Component Naming Best Practices | OGC

70 © 2015 Open Geospatial Consortium Examples of model components are Cockpit, Turret, Rudder, Engine, Anchor, Flight_Deck, Tire, Landing_Gear, Chimney, etc. Chapter 6, CDB OpenFlight Models provides details on how to use one of these names to identify a particular model component.

2.4.1 Adding New Model Components

The user may propose missing model component names for inclusion into subsequent versions of the Specification. In the meantime, the missing name can be used to tag a specific model component and a simulation client-device can use that name to detect and control the new component.

2.5 Materials

This portion of the CDB Specification deals with the handling of materials that make up the synthetic environment. The CDB Specification provides a flexible means to store and represent materials found in the CDB representation of the synthetic environment. In general, materials are inputs to production or manufacturing. They are often raw - that is unprocessed, but are sometimes processed before being used in more advanced production processes. A material represents the substance or substances out of which a thing is or can be made. The CDB Specification provides the means to represent: Basic homogeneous materials such as steel, aluminum, copper, sand, soil, stone, glass, concrete, wood, water, rubber. CDB materials are chosen for their relevance to simulation, in particular, thermal spectrum simulation. Aggregates or mixtures of basic materials Composite materials, i.e., a structured arrangement of basic materials or of aggregates which together represent a composite’s material that has: o A Surface Substrate o A Primary Substrate o One or more optional Secondary Substrates Appendix L of this Specification provides a list of CDB Base Materials. All references to Composite Materials must, in the end, resolve down to one or more of the stated CDB Base Materials. Sensor simulation typically requires a simulation of the device itself, supplemented by a complete simulation of the synthetic environment over the portion of the electromagnetic spectrum that is relevant to this device. The former simulation is referred to as the Sensor Simulation Model SSM while the latter is called the Sensor Environmental Model SEM. Most SEMs in existence today rely heavily on environmental database whose content is designed to match the functionality, fidelity, structure and format requirements of the SEM. The level of 71 © 2015 Open Geospatial Consortium realism possible by the SEM depends heavily on the quality, quantity and completeness of the data available. This makes the environmental database highly device-specific. The task of determining a definitive list of material properties that would accommodate all of the above requirements for the today’s sensor types, vendor implementations and SEMs would be a significant challenge. Instead, the CDB Specification defines and publicly defines a list of materials that can be used in a CDB. It is the responsibility of vendors to internally define the properties that satisfies the sensor type for these CDB materials. Vendors are totally free to select material properties that satisfy the fidelity, functionality and precision requirements of the SEM for the sensor type of interest. Section A.1 of Appendix A provides a rationale for the approach taken by the CDB Specification.

2.5.1 Base Materials