CIG (Computer Image Generation) Data Bases in an Instance: Bits and Pieces,
EVANS AND SUTHERLAND COMPUTER CORP SALT LAKE CITY UTAH
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Strategies may be developed to reuse bits and pieces of CIG data base models and map them throughout the data base to create a one to one real world correspondence. The net effect is that data base development costs are reduced and the amount of required on-line data storage is decreased. Further, scene densities may be increased to take full advantage of image generator capabilities and are not degraded by lack of on-line storage availability. This notion implies that there exists a library of CIG models of standard cultural features that may be mapped or instanced throughout the geographic region. Further, the geographic region itself is a terrain model made up of instanced pieces derived from the Digital Landmass System DLMS data base, Digital Terrain Elevation Data DTED. Another implication is that the image generator IG is capable of run time replication of these models throughout the data base. This concept of a library of cultural features ties closely to data provided by the Defense Mapping Agency DMA in the DLMS data base, 2nd Edition as well as the prototype specification to support High ResolutionTerrain Analysis Applications. This paper will show methods used to develop a collection of Bits and Pieces of real world cultural features and how to use information from DMA data tapes to map these features onto the terrain. The nature of the IG hardware used to achieve these results will also be discussed.