Transcription of FEATURES SHOWN ON TOPOGRAPHIC MAPS - USGS
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FEATURES SHOWN ON TOPOGRAPHIC MAPS - USGS
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 .. b. Lines and symbols .. c. Letters and numbers .. d. Map scale .. Problem of selecting FEATURES . 4. Selecting map FEATURES for a purpose 5. Other factors in selecting map Page 5 5 5 5 5 5 5 6 6 6 6 6 FEATURES .. 7 a. Legibility .. 7 b. Cost of production .. 8 c. Obsolescence .. 8 d. Concept of a landmark 8 Map delineation of TOPOGRAPHIC relief 8 6.
tion figures. Letters and numbers are essen tial to map interpretation, but they tend to ob scure other map information. Therefore, they must be selected and positioned carefully on the map so that interference with other detail is kept to a minimum. d. Map scale. --Map scale is the relation ship of the size of the map to the size of the
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