8/26/2011 Class Objectives CE 211 – SURVEYING ENGINEERING • Define mistakes and errors in measurements and FALL 2011 – CLASS 03: THEORY OF relate them to different sources • Compute the most probable value, standard ERROS deviation, and 95 % error • Understand how errors propagate through multiple measurements Ahmed Abdel-Rahim, Ph.D, P.E. • Define accuracy and precision Associate Professor, Civil Engineering MISTAKES AND ERRORS MISTAKES AND ERRORS • No measurement can be perfect or exact • Blunders because of the physical limitations of the – A blunder is a significant mistake caused by human error. measuring instruments ...
Nyrnes-Torkildsen-Nahavandchi.fm Page 1 Friday, April 8, 2005 10:55 AM Detection of Gross Errors in Wellbore Directional Surveying for Petroleum Production with emphasis on Reliability Analyses Erik Nyrnes, Torgeir Torkildsen, Hossein Nahavandchi Vitenskapelig bedomt (refereed) artikkel Erik Nyrnes & al.: Detection of Gross Errors in Wellbore Directional Surveying for Petroleum Pro- duction with emphasis on Reliability Analyses. KART OG PLAN. Vol 65, pp. 1–19 P.O.B. 5003 N-1432 As, ISSN 0047-3278 This paper presents a method for the detection of gross errors in wellbore directional survey data. The method is general, and is applicable for both ...
Surveying & Measurement Accuracy and Precision Accuracy and Precision • What is accuracy? Accuracy is the nearness of a measurements to the true value. • What is precision? Precision is the amount by which a measurement deviates from its mean. Accuracy and Precision • Suppose that you measure the same line five times. • The first party reports the following measurements: 736.80, 736.70, 736.75, 736.85, and 736.65 m. [more accurate] • The second party reports the following measurements: 736.42, 736.40, 736.40, 736.42, and 736.41 m. [more precise] • The ...
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