QUESTIONS

3. Make sure that, in computing latitudes and departures, you have not accidently used cosine instead of sine or vice versa. The latitude of a traverse line equals the product of the length times the cosine of the bearing; the departure equals the product of the length times the sine of the bearing. 4. Make sure that you have given each bearing the proper compass direction; that is, the direction of the front bearing, NOT that of the back bearing. 5. Make sure that you copied all bearings and distances correctly. 6. Make sure that you copied all cosines and sines correctly. 7. Make sure that you made no arithmetical errors. If none of these procedures serves to identify the mistake, you will have to rerun the traverse. If you must of closure on the plot. Often, the traverse line that contains the mistake is parallel to this line. If there is a line that is parallel, you should start your rerun with this one. QUESTIONS Q1. What are the two principal methods of indirect leveling? Q2. Refering to figure 7-43, you have determined the slope distance from BM31 to point A to be 404.163 meters. If you disregard corrections for standard error, temperature, and sag, what is (a) the horizontal distance from BM31 to point A and(b) the elevation at point A? Q3. Refer to figure 7-44. What is the error of closure? Is this error of closure satisfactory for do this, examine the direction of the line of linear error third-order leveling? Figure 7-43.—Trigonometric leveling scenario for question Q2. Figure 7-44.—Field notes for a differential-level circuit. 7-29