If an EDM instrument has a purported accuracy capability of ± (11.5 mm + 2ppm2), what error can be expected in a measured distance of (a) 25 m, (b) 483.40 ft,(c) 387.563 m? (Assume that the instrument and target miscentering errors are equal to zero.)

If an EDM instrument has a purported accuracy capability of ± (11.5 mm + 2ppm2), what error can be expected in a measured distance of (a) 25 m, (b) 483.40 ft,(c) 387.563 m? (Assume that the instrument and target miscentering errors are equal to zero.)

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter14: Highway Surveys And Location

Section: Chapter Questions

Problem 5P

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Photogrammetry

Photogrammetry is a technology of taking measurements of physical objects present in the environment, using photographs. It includes the process of recording and analyzing a three-dimension image in the two-dimension form. Photogrammetry was invented around 150 years ago in 1851 by Aimé Laussedat, he was also known as the father of photogrammetry, but this method was not in use until 50 years after its invention. This method was first used in Germany by Dr. Albrecht Meydenbauer in 1893 who was the director of the Royal Prussian Photogrammetric institute founded by him.

Question

If an EDM instrument has a purported accuracy capability of ± (11.5 mm + 2ppm2), what error can be expected in a measured distance of (a) 25 m, (b) 483.40 ft,
(c) 387.563 m? (Assume that the instrument and target miscentering errors are equal to zero.)

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