5:22 PM d21.sdbor.edu No SIM Do the following problems modifiedfrom the testbook

Question

5:22 PM d21.sdbor.edu No SIM Do the following problems modifiedfrom the testbook, Make sure to show all work! Please conform to the Assignments section of the Syllabus Please note that, as stated in class Wednesday, September 8, 2017, problems are modified from the book. Chapter 4 4.1 Define the following leveling terms: (a) vertical datum, (b) level line, and (e) benchmark. (I point) 14 What error results if the curvature and refraction correction is neglected in trigonometrie leveling for sights: (a) 4000 ft long (b) 1800 m long (c) 1.75 mi long? (1 point) Chapter 5 S.2 What is the difference between a benchmark and a turning point in differential leveling? (1 point 5.12 Prepare a set of level notes for the data listed. Perform a check and adjust the misclosure. Elevation of BN17 is 2303.45 fL If the total loop length is 2400 ft, what order of leveling 15 represented?

Explanation / Answer

4.1

a) A vertical datum is a point (temporary or permanent) which serves as the base point to measure other elevations in a particular location.

b) Level line - A level line is a curved line parallel to the mean spheroidal surface of the earth.

c) Benchmark - A benchmark is a permanent reference point established at a known elevation with great accuracy for measuring elevation of other units.

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