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Lab Exercise U.S. Geological Survey Topographic Maps Objective: To learn the features of standard U.S. Geological Survey topographic maps. Materials: A complete USGS topographic quadrangle is helpful, but not requircd. Resources: Internet access or mobile device QR (Quick Response) code reader app Reference: Hess, Darrel. McKnight's Physical Geography, 12th ed., pp. A3-AT optional). TOPOGRAPHIC MAPS Topographic maps are large-seale maps that use contour lines to portray the elevation and shape pographic maps of the The largest scale printed maps are those at a scale of 1:24,000 (I inch represents 2000 fect; of the topography. Topographic maps show and name both natural and human-made features. The U.S. Geological Survey (USGS) is the principal government agency that provides to United States. USGs topographic maps cover the entire United States at several different scales. 1 cm represents 0.24 km). The long-established 1:62,500 scale maps (1 inch represents about 1 mile; 1 cm represents about 0.6 km) have been replaced by 1:100,000 scale maps (1 inch represents about 1.6 miles: I cm represents I km). The entire country is also mapped at a scale of 1:250,000 (1 inch represents about 4 miles; I em represents 2.5 km). The primary scale for mapping Alaska has been 1:63,360 (l nch repre sents 1 mile; 1 em represents 0.63 km), although larger scale maps cover part of this state as well. Printed versions of topographic maps are available for purchase through the USGS: however, US Topo (http:// nationalmap.gov/ustopol) lets you download free electronic versions of USGS topographic maps in an easy-to-use PDF format. The most recent US Topo maps let you tun on and off data layers such as contour lines and satellite imagery. In addition, The National Map (http://nationalmap.gov) lets you select and download a wide variety of topographic maps, aerial photographs, and satellite imagery of most parts of the United States. Electronic copies of old maps (going back to the 1880s) are obtained from the Historical Topographic Map Collection at http:/ingmdb.usgs.,gov/maps/TopoView/ MARGINAL DATA ON USGS MAPS In this exercise, we will focus primarily on the information found in the margins of these maps (this information has been omitted from most of the maps reproduced for future exercises). Maps T-18 and T-19, at the end of this chapter, show the lower right comer of a standard USGS topo- graphic map with a scale of 1:24,000 (one of the USGS "72 minute" maps). The name of this map, or quadrangle, is Greasewood Spring, Arizona." Below the name is the date of publication, in this case, 2014. To the left of the name is a small map showing the quadrangle location in Arizona. Twelfth Edition Danel Hess Cpystt O 2017 by Pearson Education, Inc. All rights reserved
Explanation / Answer
1. The contour interval(between each individual contour line) is 20 feet. Its mentioned in the bottom of the map.
2. The difference in elevation of index contour is 100 feet. Index contours are those darkened contour lines where heights are mentioned.
3. The elevation of the highest contour line at the top of Twin buttes is 6300 feet. It can be seen from the map.
4. The dashed blue lines represent intermittent streams.
