PPT Slide
Why is a Spatial Reference Model (SRM) Needed?
- The Modeling & Simulation (M&S) community has not been consistent in the treatment of models of the Earth and related coordinate systems.
- Consistency is required for joint distributed simulation in order to:
- Achieve a reasonably level playing field,
- To support meaningful VV&A.
- A number of different Earth reference models (ERMs) are currently employed and this affects:
- Representation of the environment in M&S and authoritative data bases.
- Dynamics formulations, both kinematics and kinetics (movement).
- Acquisition modeling and processing (inter-visibility).
- Approximations in coordinate transformation algorithms made to reduce processing time may introduce additional inconsistencies.
� Lossless and accurate spatial operations are critical to representation and interchange of location data.
- A nomenclature inconsistency exists.
- For example, how do these variables relate?
- Altitude, elevation, height, geodetic height, ellipsoidal height, orthometric height, height above sea level, height above mean sea level, terrain height, pressure altitude, temperature altitude, nap of the Earth, ...