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TRIGONOMETRIC LEVELING - 14070_122
LEVEL AND TRAVERSE COMPUTATIONS - 14070_124

Engineering Aid 1 - Advanced Structural engineering guide book
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Figure  7-2.—Difference  in  elevation  in  trigonometry  leveling. Figure 7-3.—Lines of indirect levels. In figure 7-2, a transit is setup and leveled at A. The intersection of your line of sight with the rod (point C). rodman holds a rod on B. The instrumentman trains the Computing the DE consists of multiplying the measured telescope on C, which is an easily read value (usually a distance by the proper trigonometric function of the full foot) on the rod. With the telescope trained on C, the measured  angle  (sine,  when  slope  distance  (OC)  is vertical angle (a) is read. Then either the horizontal measured;  tangent,  when  horizontal  distance  (OD)  is distance or the slope distance between the instrument measured). and rod is determined. Now one side and one angle of a The  following  paragraphs  discuss  typical  situations right triangle (OCD) are known. From your knowledge that  you  will  encounter  in  trigonometric  leveling.  You of trigonometry, you know that the other sides and angle will see in each of these situations the reamer in which can  be  computed.  However,  in  trigonometric  leveling, the computed DE is applied to determine the HI and you are concerned only with determining the length of required  elevations. the side opposite the measured angle (side CD). The length of this side is the difference in elevation (DE). 1.   DEPRESSION   ANGLE   BACKSIGHT   (fig. As-you can see in figure between  the  height  of 7-2, the DE is the distance 7-3, view A). The rod is on point B below the instrumerit. instrument  (HI)  and  the The  measured  vertical  angle  (a)  is  a  depression  (minus) 7-3







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