MSL101L04 Basic Map Reading SR.pdf lesson 4.pdf

Before issuing to the troops foreign maps are usually

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differ from ours. Before issuing to the troops, foreign maps are usually evaluated in regard to established accuracy standards, because their accuracy varies considerably. (See Appendix C for additional information.) Atlases. Atlases are collections of maps of regions, countries, continents, or the world. Such maps are accurate only to a small degree and are used for general information only. Geographic maps. Geographic maps provide an overall idea of the mapped area in relation to climate, population, relief, vegetation, and hydrography. They also show the general location of major urban areas. Tourist road maps. Tourist road maps are maps of a region where the main means of transportation and areas of interest are shown. Some of these maps depict secondary networks of roads, historic sites, museums, and beaches in detail. They may contain road and time distance between points. Carefully consider the scale when using these maps. City/Utility maps . City/utility maps are maps of urban areas showing streets, water ducts, electricity and telephone lines, and sewers. Field sketches. Field sketches are preliminary drawings of an area or piece of terrain. (See Appendix D.) S TANDARDS OF A CCURACY 2-12. Accuracy is the degree of conformity that horizontal positions and vertical values are clearly represented on a map in relation to an established standard. The NGA determines the standard based upon user requirements. Unless otherwise specified in the marginal information, consider maps to meet accuracy requirements.
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15 November 2013 TC 3-25.26 3-1 Chapter 3 Marginal Information and Symbols It is important that Soldiers know how to read maps, and the place to begin is the marginal information and symbols, where useful information about the map is located and explained. All maps are not the same, so it is necessary to examine the marginal information carefully each time a different map is used. MARGINAL INFORMATION ON A MILITARY MAP 3-1. Figure 3-1 shows a reduced version of a large-scale topographic map. The circled numbers indicate the items of marginal information that the map user needs to know. These circled numbers correspond to the following: Sheet name (1). The sheet name is found in bold print at the center of the top and in the lower left area of the map margin. A map is generally named for the largest settlement contained within the area covered by the sheet, or for the largest natural feature located within the area at the time the map was drawn. Sheet number (2). The sheet number is found in bold print in the upper right and lower left areas of the margin, and in the center box of the adjoining sheets diagram found in the lower right margin. To link specific maps to overlays, operations orders, and plans, use the sheet number as reference. For maps at 1:100,000-scale and larger, the sheet numbering system is arbitrary and makes possible the ready orientation of maps at scales of 1:100,000, 1:50,000, and 1:25,000.
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  • Fall '16
  • Cartography, Geographic coordinate system, Topographic map, Universal Transverse Mercator coordinate system

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