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2 Distance Measurement

2 Distance Measurement - Distance Measurement CE 111...

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Distance Measurement CE 111
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Distance Traditionally, long distance measurement was difficult So it was generally avoided Distance on land was hard, distance at sea even more so Developments in the industrial revolution made the process easier Rapid advances since 1980
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Three Types of Distances: Vertical Horizontal Slope
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Techniques of Distance Measurement: Pacing Odometer Chain Steel~Fiberglass Tapes Electronic distance measurement (EDM)
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Taping Accessories Plumb bob Hand level Chaining Pins Tension handle
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Chain Invented in 1620 Distance = 66 feet Comprised of 100 links In 1785, the U.S. Government ~ Federal Law Surveys had to be done with a chain Used for centuries
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Chain Provides the origin of the “acre” 1 x 10 chains Used to lay out early 2-lane roads Many 66‟ Right -of-Ways
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The Steel Tape (Band) Made from steel. Distance (typically) = 100‟ Have to apply corrections
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Horizontal Taping Using Plumb Bobs at Both Ends of the Tape
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Horizontal Taping Using a Plumb Bob at One End
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"Breaking Tape" Along a Slope.
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Slope While we consider the Earth to be a plane, it is not flat.
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