LSIT Surveying Principles and Practices 3

Question 1

In differential leveling, what is the formula for the elevation of a new point?

Accepted Answer

Elevation = HI − Foresight

Answer

The new elevation equals the Height of Instrument (HI) minus the foresight rod reading: Elev = HI − FS.

Question 2

What is the primary difference between a 'monument' and a 'marker' in boundary surveying?

Accepted Answer

A monument is a physical object occupying the true position of a corner; a marker is placed near but not at the corner

Answer

A monument occupies the exact corner position and controls the boundary, while a marker (or witness post) is placed nearby to help find the monument.

Question 3

Which type of error increases proportionally with the number of instrument setups in a level circuit?

Accepted Answer

Collimation errors

Answer

Collimation error (line of sight not horizontal) is systematic and accumulates with each setup, increasing proportionally with the number of setups if backsight and foresight distances are unequal.

Question 4

A traverse has a linear closure error of 0.12 ft over 1,200 ft total distance. What is the precision ratio?

Accepted Answer

1/10,000

Answer

Precision = 1 / (total distance / closure error) = 1 / (1200 / 0.12) = 1/10,000.

Question 5

In GNSS surveying, what does PDOP (Position Dilution of Precision) measure?

Accepted Answer

The combined geometric effect of satellite distribution on 3D position accuracy

Answer

PDOP quantifies how satellite geometry affects 3D position error; a low PDOP (≤3) indicates good geometry and better positional accuracy.

(LSIT) Land Surveyor in Training Practice Test

(LSIT) Land Surveyor in Training Practice Test

LSIT Surveying Principles and Practices 3