FEATURES SHOWN ON TOPOGRAPHIC MAPS
GEOLOGICAL SURVEY CIRCULAR 368 FEATURES SHOWN ON TOPOGRAPHIC MAPS UNITED STATES DEPARTMENT OF THE INTERIOR Douglas McKay, Secretary GEOLOGICAL SURVEY W. E. Wrather, Director GEOLOGICAL SURVEY CIRCULAR 368 FEATURES SHOWN ON TOPOGRAPHIC MAPS By John B. Rowland Washington, D. C., 1955 Free on application to the Geological Survey, Washington 25, D. C. GEOLOGICAL SURVEY TOPOGRAPHIC INSTRUCTIONS Chapter 1 B 3 FEATURES SHOWN ON TOPOGRAPHIC MAPS Contents Abstract .............. . Principles of map representation 1. Definition of a n1ap a. TOPOGRAPHIC map . . . . . . . . . b. Planimetric map ..... 2. Elements of map construction . a. Colors and classes of FEATURES .
The amount of information shown on a topographic map depends on the map scale, the purpose of the map, and the cost of obtain ing the information. This chapter describes the three main categories of map information and the methods by which they are shown. Reference lists of published maps and a chart illustrating standard map symbols are
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