LSIT Mathematics and Geomatics 5

Question 1

The Elevation Factor (EF) used in geodetic-to-grid distance reduction is calculated as:

Accepted Answer

R / (R + H), where R is Earth's radius and H is mean elevation above ellipsoid

Answer

(R + H) / R

Answer

H / R

Answer

R × H

Question 2

In a curve layout using deflection angles, the deflection angle from the PC to any point on the curve equals:

Accepted Answer

Half the central angle subtended from the PC to that point

Answer

The full central angle to that point

Answer

The tangent angle at that point

Answer

One-quarter of the central angle

Question 3

A cadastral survey is primarily concerned with:

Accepted Answer

Defining and documenting land ownership boundaries and property rights

Answer

Measuring elevations for topographic mapping

Answer

Establishing geodetic control networks

Answer

Monitoring structural deformation

Question 4

The standard deviation of a single measurement where n repeated observations have a standard deviation of the mean (σm) is:

Accepted Answer

σ = σm × √n

Answer

σ = σm / √n

Answer

σ = σm × n

Answer

σ = σm²

Question 5

In LiDAR surveys, the point density is most directly controlled by:

Accepted Answer

Pulse repetition frequency, scan angle, and aircraft speed and altitude

Answer

Receiver GPS update rate only

Answer

The wavelength of the laser

Answer

Number of return pulses per shot

Question 6

The term 'closing the horizon' in theodolite work means:

Accepted Answer

Measuring all horizontal angles around a full 360° to check that they sum to 360°00'00"

Answer

Completing a traverse loop back to the starting point

Answer

Leveling the instrument after each pointing

Answer

Recording the final backsight at the end of the day

Question 7

The 'sea-level correction' (or arc-to-chord correction) is applied in geodetic traverse computations to account for:

Accepted Answer

The difference between a measured ground distance at elevation and the corresponding distance at the ellipsoid

Answer

Magnetic variation between stations

Answer

Atmospheric refraction of EDM signals

Answer

Vertical angle errors in slope reduction