ASCE ASCE Surveying and Geomatics 2

Question 1

What is the horizontal datum used for most modern US surveying and mapping?

Accepted Answer

NAD 83 (North American Datum of 1983)

Answer

NAD 83 is the current horizontal geodetic datum for the US, based on the GRS 80 ellipsoid and realized through a nationwide network of control points.

Question 2

What is the vertical datum for most modern US elevation measurements?

Accepted Answer

NAVD 88 (North American Vertical Datum of 1988)

Answer

NAVD 88 is the current official vertical datum for the continental US, established by a minimally constrained adjustment based on tidal gauge data.

Question 3

In photogrammetry, what is the purpose of ground control points (GCPs)?

Accepted Answer

To georectify aerial imagery to real-world coordinates

Answer

GCPs are surveyed points with known coordinates used to transform photogrammetric models from image space to a georeferenced real-world coordinate system.

Question 4

What does LiDAR stand for and what does it measure?

Accepted Answer

Light Detection and Ranging; measures distances using laser pulses

Answer

LiDAR emits laser pulses and measures the time for each pulse to return, calculating distances to create dense three-dimensional point clouds.

Question 5

What is the purpose of a metes and bounds description in a property survey?

Accepted Answer

To describe a parcel boundary using distances, bearings, and landmark references

Answer

A metes and bounds description defines a property boundary as a series of courses (bearing and distance) starting and ending at a defined point of beginning.

ASCE - American Society of Civil Engineers Certification Practice Test

ASCE - American Society of Civil Engineers Certification Practice Test

ASCE ASCE Surveying and Geomatics 2