Self Study: Distances

Problem (1)

Calibration data

Tape is 99.995 ft long, fully supported, at 68°F, and under 18 pounds of pull.

Its cross-sectional area is 0.003 sq inches with a 3.0x107 psi modulus of elasticity, 6.5x10-6 ft/ft/°F thermal coefficient, and 0.0195 lb/ft weight.

Use data

A distance was measured in two 50 ft end support segments, two 100 ft end support segments, three fully supported 100 ft segments, and one 78.46 ft end support segment, all using a 25 pound pull. The temperature was 80°.

To the nearest 0.001 ft, what is the corrected distance?



Problem (2)

Given the EDM measurements table, determine the horizontal  and vertical distances to 0.01 ft. Account for curvature and refraction. Instrument and reflector heights were 5.69 ft and 6.00 ft, respectively.

To point Zenith Angle Slope Dist (ft)
101 79°05'20' 702.56
102 88°35'30" 1193.25
103 92°58'45" 856.39



Problem (3)

Given the stadia readings in the table, determine the horizontal and vertical distances. Express to reasonable levels of accuracy.

The instrument used had a stadia multiplier and constant of 100 and 0 ft, and 5.50 ft height.

  Readings (ft) Zenith
To Point Top Mid Bot Angle
R 6.76 5.50 4.25 88°50'35"
S 7.03 6.25 5.48 93°05'50"
T 6.01 4.95 3.90 91°18'55"



Problem (4)

A distance of 1400.00 ft is to be laid out with a maximum distortion of 1/50,000. The TSI used has a MSA of ±(4 mm + 3 ppm). The instrument operator is able to consistently set up the TSI with a centering error of ±0.004. What is the maximum reflector centering error? Express to 0.001 ft.



Problem (5)

How much higher or lower can one end of a suspended 100 ft tape be held and still meet a distortion of 1/10,000 or better? Ignore the effects of pull, sag, and temperature.



Problem (6)

To calibrate her pacing, a surveyor paced a known 176.5 ft ling base line four times: 93.5, 94.5, 95.0, 93.0. She then preoceded to pace the perimeter of a warehouse in order to determine its area. Her three pacing trips around the perimeter were:

    1. 144.5, 110.0, 144.0, 111.5
    2. 145.5, 110.5, 143.5, 110.5
    3. 146.0, 109.5, 144.0, 110.5

What is the area of the warehouse to the nearest 10 sq ft?

Solution: Distances