MSL101L04 Basic Map Reading SR.pdf lesson 4.pdf

The topographic information is identical on both but

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joint operations graphic (air). The topographic information is identical on both, but the ground version shows elevations and contours in meters and the air version shows them in feet. Layer (elevation) tinting and relief shading are added as an aid to interpolating relief. Both versions emphasize air-landing facilities (shown in purple), but the air version has additional symbols to identify aids and obstructions to air navigation. (See Appendix B for additional information.) Photomosaic. This is an assembly of aerial photographs that is commonly called a mosaic in topographic usage. Mosaics are useful when time does not permit the compilation of a more accurate map. The accuracy of a mosaic depends upon the method employed in its preparation, and may vary from a good pictorial effect of the ground to that of a planimetric map. Terrain model. A terrain model is a scale model of the terrain showing features. Large- scale models also depict industrial and cultural shapes. It provides a means to visualize the terrain for planning or indoctrination purposes, and for briefing on assault landings. Military city map. A military city map is a topographic map (usually at 1:12,550-scale, and sometimes up to 1:5,000-scale) showing the details of a city. It delineates streets and shows street names, important buildings, and other elements of the landscape significant to navigation and military operations in urban terrain. The scale of a military city map depends upon the importance and size of the city, density of detail, and available intelligence information. Special maps. Special maps are for special purposes such as trafficability, communications, and assaults. They are usually in the form of an overprint in scales larger than 1:1,000,000 but smaller than 1:100,000. A special purpose map is one that has been designed or modified to give information not covered on a standard map. The wide range of subjects covered under the heading of special purpose maps prohibits (within the scope of this manual) more than a brief mention of a few important subjects, such as— - Terrain features. - Drainage characteristics. - Vegetation. - Climate. - Coasts and landing beaches. - Roads and bridges. - Railroads. - Airfields. - Urban areas. - Electric power. - Fuels. - Surface water resources. - Ground water resources. - Natural construction materials.
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Maps 15 November 2013 TC 3-25.26 2-7 - Cross-country movements. - Suitability for airfield construction. - Airborne operations. MILITARY MAP SUBSTITUTES 2-11. If military maps are not available, use substitute maps. These can range from foreign military or commercial maps, to field sketches. The NGA can provide black and white reproductions of many foreign maps, and produce its own maps based upon intelligence. Foreign maps. Foreign maps have been compiled by nations other than our own. When used, change the marginal information and grids to conform to U.S. standards, if time permits. The scales may differ from our maps, but they do express the ratio of map distance to ground distance and are used in the same way. Use the legend since the map symbols almost always differ from ours. Before issuing to the troops, foreign maps are usually evaluated in regard to
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