What parameters are available to key pattern retrieval and guide usage?
Keyword searches are available. For automatic generation, every pattern is coded to Interim Terrain Data (ITD) feature type classification. ITD files are produced by the Defense Mapping Agency and can be used to construct simulator databases. There is not nearly as much coverage with ITD as there is with the established DFAD products, but DFAD has only a few types of feature data compared to the many types in the library. To further assist automated usage, patterns are described by scale, subject keywords, predominant color, time-of-day, time-of-year (for foliage changes), direction of features (for patterns like row crops, roads, railroad tracks), and direction of shadows.
