Grumman is developing an aircrew trainer suite for the A-6 and F-14 aircraft. The primary mission of the A-6 is ground/surface attack, while that of the F-14 is air superiority. A major part of the development is designing a visual simulation database that is correlated with a high resolution radar database. Analysis and evaluation were performed on alternative approaches to developing a terrain skin database. Costs and benefits of the alternative approaches are discussed.