A surveyor set his instrument up at point A to observe points B and C which are both ahead of his set up point. The following data was tabulated based on his observations: ROD/Point Vertical Angle Stadia Hair Readings Upper Middle Lower -25°15' 2.316 1.877 1.438 +45°57' 3.333 2.011 0.689 Upon calibration, the focal length was found out to be 27cm. As advertised, the length of the instrument's telescope is 10cm and the length between the upper and lower stadia hairs of the telescope is 2.703mm. a) What is the stadia constant of the instrument? b) What is the stadia interval factor? c) What is the horizontal distance between points B & C? d) What is the difference in elevation between B & C?
A surveyor set his instrument up at point A to observe points B and C which are both ahead of his set up point. The following data was tabulated based on his observations: ROD/Point Vertical Angle Stadia Hair Readings Upper Middle Lower -25°15' 2.316 1.877 1.438 +45°57' 3.333 2.011 0.689 Upon calibration, the focal length was found out to be 27cm. As advertised, the length of the instrument's telescope is 10cm and the length between the upper and lower stadia hairs of the telescope is 2.703mm. a) What is the stadia constant of the instrument? b) What is the stadia interval factor? c) What is the horizontal distance between points B & C? d) What is the difference in elevation between B & C?
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Transcribed Image Text:A surveyor set his instrument up at point A to observe points B and C which are both ahead of his set up
point. The following data was tabulated based on his observations:
ROD/Point
Vertical Angle
Stadia Hair Readings
Upper
Middle
Lower
B
-25°15'
2.316
1.877
1.438
C
+45°57'
3.333
2.011
0.689
Upon calibration, the focal length was found out to be 27cm. As advertised, the length of the
instrument's telescope is 10cm and the length between the upper and lower stadia hairs of the
telescope is 2.703mm.
a) What is the stadia constant of the instrument?
b) What is the stadia interval factor?
c) What is the horizontal distance between points B & C?
d) What is the difference in elevation between B & C?
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