PS Photogrammetry & Remote Sensing 2

Question 1

LiDAR (Light Detection and Ranging) determines distances by:

Accepted Answer

Recording the two-way travel time of emitted laser pulses and their returns

Answer

LiDAR emits laser pulses and precisely measures the round-trip travel time; multiplying by the speed of light and dividing by two gives the distance to the reflecting surface.

Question 2

Ground Sample Distance (GSD) in aerial or satellite imagery is best described as:

Accepted Answer

The real-world size (area) of one image pixel as measured on the ground

Answer

GSD is the ground dimension represented by a single pixel; a smaller GSD indicates finer spatial resolution and more feature detail in the imagery.

Question 3

Which statement best describes passive remote sensing?

Accepted Answer

The sensor detects naturally available energy such as reflected solar radiation or thermally emitted energy from Earth's surface

Answer

Passive sensors record energy from natural sources—primarily reflected sunlight or long-wave thermal emission—without generating their own illumination, unlike active sensors such as LiDAR or RADAR.

Question 4

The primary purpose of aerial triangulation (aerotriangulation) is to:

Accepted Answer

Extend control from a sparse network of surveyed ground points to all photograph positions in the block

Answer

Aerotriangulation uses image coordinate measurements in overlapping photos and a minimal set of ground control points to solve for the exterior orientation (position and attitude) of every photo in the project block.

Question 5

Fiducial marks in a metric aerial camera are used to:

Accepted Answer

Define the interior photo coordinate system and locate the principal point for each exposure

Answer

Fiducial marks are precisely positioned reference targets fixed in the camera body that appear at the edges or corners of every exposure, establishing the image coordinate system needed to identify the principal point location.

(PS) Professional Licensed Surveyor Practice Test

(PS) Professional Licensed Surveyor Practice Test

PS Photogrammetry & Remote Sensing 2