Information about specific survey control points or benchmarks found on each topographic map is maintained in the NGS Data Sheets database maintained by the National Geodetic Survey.įour grid systems are shown on most USGS topographic maps: Topographic Map Symbols (paper copies kept in the vertical filing cabinets in the Map and Atlas Collection) lists symbols found on USGS topographic maps. For additional background information on print and digital production see 125 Years of Topographic Mapping. This coverage includes more than 55,000 7.5-minute quadrangles. In 1991 the USGS completed its analog map coverage of the 48 contiguous states of the United States at a 1:24,000 scale. Maps for America (US Geological Survey) 1981 (Docs I 19.2:M32/12 1981) includes detailed information on the characteristics, natural features, cultural features, boundaries, names, marginalia, projection, reference systems, and geodetic control found on topographic maps. Geological Survey topographic maps including their characteristics, production, and history. Topographic Maps provides an overview of U.S. Includes graphic indexes for many series. World Mapping Today (Pary and Perkins) 2002 (ref GA 105.) On a country-by-country basis details the status of national mapping programs, including major thematic and topographic map products.National Mapping Agencies Contact Information (United Nations).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |