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Topographic maps are also commonly called contour maps or topo maps. In the United States, where the primary national series is organized by a strict 7.5-minute grid, they are often called or quads or quadrangles. Topographic maps conventionally show topography, or land contours, by means of contour lines.
The United States Geological Survey (USGS) topographical survey maps included contour representation of relief, and so maps that show relief, especially with exact representation of elevation, came to be called topographic maps (or "topo" maps) in the United States, and the usage has spread internationally.
The U.S. Geological Survey Library has become one of the largest geoscience libraries in the world. Materials within the library system include books and maps dating back to the 16th and 17th centuries, as well as a nearly complete set of the various State Geological Survey publications.
Map updating is a regular process and done once every five to seven years. At present the SOB is digitally updating the base map of Bangladesh. The SOB publishes all the maps from its own offset printing press and the products are available in its sales centre at the SOB campus located in the Tejgaon Industrial Area, Dhaka-1208.
The National Map is a significant contribution to the U.S. National Spatial Data Infrastructure (NSDI) from the Federal Geographic Data Committee (FGDC) and currently is being transformed to better serve the geospatial community by providing high quality, integrated geospatial data and improved products and services including new generation ...
The Geographic Names Information System, developed by the BGN in cooperation with the US Geological Survey, includes topographic map names and bibliographic references. The names of books and historic maps which confirm the feature or place name are cited. Variant names, alternatives to official federal names for a feature, are also recorded.
The logo of the United States Geological Survey (USGS) The Geographic Names Information System (GNIS) is a database of name and location information about more than two million physical and cultural features throughout the United States and its territories; the associated states of the Marshall Islands, Federated States of Micronesia, and Palau; and Antarctica.
Sippi Arsuang is located at N 22°11′03.43″ E 92°29′01.57″ with a height of 896 m (2,940 ft) (15 m (49 ft) accuracy). In US Army 1:250k topo map this peak is shown as Ramju Taung with a height of 3,016 ft (919 m) and in Russian 1:200k topo map it is shown as 917 m (3,009 ft). [26]