CH Geodesy & Coordinate Systems

Question 1

Which reference surface is most commonly used for geodetic measurements?

Accepted Answer

Ellipsoid

Answer

Geoid

Answer

Mean Sea Level

Answer

Topographic Surface

Question 2

What does a map projection primarily do in geodesy?

Accepted Answer

Converts 3D coordinates to 2D

Answer

Corrects satellite signals

Answer

Changes the Earth's shape

Answer

Measures ocean depth

Question 3

Which coordinate system uses latitude, longitude, and height above the ellipsoid?

Accepted Answer

Geodetic

Answer

UTM

Answer

Cartesian

Answer

Polar

Question 4

Which geodetic datum is currently used by GPS?

Accepted Answer

WGS84

Answer

NAD27

Answer

NAD83

Answer

ETRS89

Question 5

What is the purpose of a datum transformation?

Accepted Answer

To switch between ellipsoids

Answer

To project 2D maps

Answer

To increase map scale

Answer

To smooth elevation data

Question 6

Which of the following best describes the geoid?

Accepted Answer

Mean sea level surface

Answer

A flat plane

Answer

An ideal sphere

Answer

The Earth’s physical surface