MSL101L04 Basic Map Reading SR.pdf lesson 4.pdf

Digital terrain elevation data the digital terrain

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Digital terrain elevation data. The digital terrain elevation data (DTED) is a uniform matrix of terrain elevation values providing basic quantitative data for all military systems that require terrain elevation, slope, and gross surface roughness information. Data density depends on the level produced. DTED0 post spacing is 30 arc seconds (approximately 1000 meters). This corresponds to a small scale hardcopy map product. DTED1 post spacing is three arc seconds (approximately 100 meters). This corresponds to a medium scale hardcopy product. DTED2 post spacing is one arc second (approximately 30 meters), corresponding to large scale hardcopy products. TalonView. The National Geospatial-Intelligence Agency uses the TalonView, a computer- based mapping application that displays various types of maps and geographically referenced overlays. Many types of maps and imagery files are supported, but the primary ones of interest to most users are aeronautical, hydrographic, topographic maps and charts, satellite images, and elevation maps. TalonView supports the GeoPDF format with a large number of overlay types that can be displayed and printed over any map background. It does not include flight mission planning components and threat analysis capabilities. TalonView was designed to be distributed to other federal agencies, first responders, and foreign partners so they have a software program that utilizes NGA digital mapping and imagery products, along with applications for geospatial intelligence data interpretation, scene visualization, and situational awareness. NGA also provides the TalonView software on the SECRET Internet Protocol Router Network and Joint Worldwide Intelligence Communications System. Vector maps. A vector map (VMap) Level 0 is the low resolution component of the VMap family of products and has a comprehensive 1:1,000,000-scale vector base map of the world. It consists of geographic, attribute, and textual data stored on CD-ROMs. VMap Level 1 contains medium resolution data at the 1:250,000 scale. The data is separated into ten thematic layers consistent throughout the VMap program. The VMap Level 2 program
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Chapter 2 2-6 TC 3-25.26 15 November 2013 is designed to provide vector-based geospatial data at high resolution. It is separated into ten thematic layers, with each layer containing thematically consistent data. Photomap. A photomap is a reproduction of an aerial photograph upon which grid lines, marginal data, place names, route numbers, important elevations, boundaries, approximate scale, and direction have been added. Joint operations graphics. Joint operations graphics are typically based upon the format of standard 1:250,000 medium-scale military topographic maps, but they contain additional information needed in joint air-ground operations. Along the north and east edges of the graphic, detail is extended beyond the standard map sheet to provide overlap with adjacent sheets. The map is identified in the lower margin as joint operations graphic (ground) or joint operations graphic (air). The topographic information is identical on both, but the
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