Interim Terrain Data (ITD) and Vector Product Interim Terrain Data (VITD) User'sGuide. Edition 1

摘要

The Interim Terrain Data (ITD)/Vector Product Interim Terrain Data(VITD) User'sGuide is intended to be a convenient reference for users of these types of terrain analysis data. ITD is a digitized version of the standard 1:50,000-scale Tactical Terrain Analysis Data Base(TTADB) product produced by the Defense Mapping Agency (DMA). Like TTADB, ITD is comprised of six thematic layers of spatial and feature data. These include Obstacles, Surface Drainage, Transportation, Surface Materials (soils), Surface Configuration (slope) and Vegetation. ITD is distributed on 9-track tape in the Standard Linear Format (SLF) using the DMA Feature File (DMAFF) coding scheme. DMA has moved to Vector Product Format (VPF) and the Feature Attribute Coding Catalog (FACC) as its standards for distributing Vector-based products. VPF is a data structure format. FACC is a hierarchically based feature and attribute-naming convention. The newer version of ITD in VPF/FACC is VITD. These and other topics are in this User's Guide. Specifically, coding schemes, data structure, file organization, and applications using the data, such as tactical decision aids(TDA), are included. Appendices include glossaries for features and attributes, and feature/attribute tables.