Angular Error Of Closure
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irregardless a word? Favorite Button CITE Translate Facebook Share Twitter Tweet Google+ Share error of closure noun, Surveying. 1. the amount by which a closed traverse fails to satisfy the requirements of a true mathematical angular error of closure formula figure, as the length of line joining the true and computed position angular error of closure definition of the same point. 2. the ratio of this linear error to the perimeter of the traverse. 3. (for angular error of closure dictionary angles) the amount by which the sum of the observed angles fails to equal the true sum. 4. (in leveling) the amount by which an elevation determined by a series of levels
Meaning Of Angular Error Of Closure
fails to agree with an established elevation. Expand Also called closing error. Dictionary.com UnabridgedBased on the Random House Dictionary, © Random House, Inc. 2016. Cite This Source British Dictionary definitions for error of closure Expand error of closure noun 1. (surveying) the amount by which a computed, plotted, or observed quantity or position differs from the true or established one, esp when plotting a define angular error of closure closed traverse Also called closing error Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollinsPublishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Cite This Source Discover our greatest slideshows 8 Offbeat Literary Genres to Get... Decode the pieces of our favorite... Know These 9 Commonly Confused... Uncover the mysteries of the marks... Browse more topics on our blog What Is the Difference Between Discreet and Discrete? Learn the correct uses of these two commonly confused homophones. What Character Was Removed from the Alphabet? What mistaken pronunciation gave this character its name? Apostrophes 101 This small mark has two primary uses: to signify possession or omitted letters. How Do I Get a Word into the Dictionary? People invent new words all the time, but which ones actually make it? Word of the Day Difficulty index for error of closure Few English speakers likely know this word Word Value for error 5 5 Scrabble Words With Friends Nearby words for error of closure error coin error correcting memory error correction error detection and correction error message error of
should theoretically equal the product of 180° (n – 2), n being the number of sides in the polygon described by the traverse. A prescribed MAXIMUM ANGULAR ERROR OF CLOSURE angular error of closure example is stated in terms of the product of a given angular value times
Link Traverse Angular Misclosure
the square root of the number of interior angles in the traverse. Again, if we use the traverse shown in
Balancing Angles
figure 13-27 as an example, the prescribed maximum angular error of closure in minutes is 01 fi because the figure has three interior angles. The sum of the interior angles should be 180°. http://www.dictionary.com/browse/error-of-closure If the sum of the angles as actually measured and recorded is 179°57´, the angular error of closure is 03´. The maximum permissible error of closure is the product of 01´ times the square root of 3, or about 1.73´. The prescribed maximum angular error of closure has therefore been exceeded.
Meeting Precision Specifications The following specifications are intended to give you only a general idea of http://www.tpub.com/engbas/13-23.htm the typical precision requirements for various types of transit-tape surveys. When linear and angular errors of closure are specified, it is understood that a closed traverse is involved. For many types of preliminary surveys and for land surveys, typical precision specifications may read as follows: l Transit angles to nearest minute, measured once. Sights on range poles plumbed by eye. Tape leveled by eye, and standard tension estimated. No temperature or sag corrections. Slopes under 3 percent disregarded. Slopes over 3 percent measured by breaking chain or by chaining slope distance and applying calculated correction. Maximum angular error of closure in minutes is 1.5 . Maximum ratio linear error of closure, 1/1000. Pins or stakes set to nearest 0.1 ft. For most land surveys and highway location surveys, typical precision specifications may read as follows: l Transit angles to nearest minute, measured once. Sights on range poles, plumbed carefully. Tape leveled by hand level, with standard tension by tensionometer or sag correction applied. Temperature correction applied if air temperature more than 15° different from standard (68°F). Slopes under 2 percent disregarded. Slopes over 2 percent measured by breaking chain or by applying approximate slope correction to slope distance.set at zero, and a backsight to the preceding station is taken. The instrument is then turned on its upper motion until the advance station is sighted and the interior angle is observed. All interior angles is http://nptel.ac.in/courses/105107122/modules/module9/html/28-18.htm generally observed twice, once with telescope direct and other with the telescope reversed. Immediately after completion of observation, an arithmetical check on the angular error of closure should be performed to detect any blunder or excessively large error in angular measurement.
Figure 28.6 shows an interior-angle closed traverse that originates at point A lying on the line PQ having a known azimuth of 42° 00' 00" as determined from a angular error previous survey. In this traverse, point A was occupied first and an angle was observed between line PQ and traverse line AB. The angle is observed to be 18° 00' 00". After the interior angle at A was observed, points B, C, D and E were occupied and interior angles was observed by method of repetition (at least twice) at each traverse station. Directions for the traverse sides are reckoned using the angle QAB angular error of turned from the line of known azimuth PQ to line AB. Thus, the azimuth of line AB is 42° 00' 00" + 18° 00' 00"= 62° 00' 00". To check the angular closure, azimuths are calculated from previously known azimuth of a line. The azimuth of each succeeding traverse line is computed by adding the clockwise interior angle or subtracting the anti-clockwise interior angle to the back azimuth of the preceding line. Thus, W.C.B. of a traverse line = Back W.C.B. of the preceding line ± included angle --------------------- (Equation 28.2) where + for clockwise interior angle and - for anti-clockwise interior angle. Further, 360° needs to be subtracted from computed W.C.B., if it is more than 360° and to be added, if the computed value is negative. The azimuth of each succeeding traverse line is then calculated by using Eq 28-2 and are as shown in column (3) of Table 28.4. In this method also there are two ways for finding the error of closure in a traverse observation. These are Azimuth adjustment method Interior angle adjustment method In azimuth adjustment method, the computed azimuth of the starting side is checked with its priori observed value. If both the values agrees, there is no error in the measurements for traverse. Otherwise there is error in measurement. To rembe down. Please try the request again. Your cache administrator is webmaster. Generated Fri, 30 Sep 2016 15:46:15 GMT by s_hv1000 (squid/3.5.20)