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What is another term for spheroid?
A. Geoid
B. Ellipsoid
C. Datum
D. None of the above
B. Ellipsoid (this multiple choice question has been scrambled)

What is a datum?
A mathematical model of the Earth, which serves as the reference or base for calculating the geographic coordinates of a location.

What 3 things make up a datum?
An origin, a spheroid, and the separation of the spheroid and the Earth at the origin.

What do conformal projections preserve?
A. Local angles and shapes
B. Consistency of scale along certain lines
C. Certain accurate directions
D. Areas
A. Local angles and shapes (this multiple choice question has been scrambled)

What do equivalent projections preserve?
A. Certain accurate directions
B. Consistency of scale along certain lines
C. Areas
D. Local angles and shapes
C. Areas (this multiple choice question has been scrambled)

What do equidistant projections preserve?
A. Local angles and shapes
B. Certain accurate directions
C. Areas
D. Consistency of scale along certain lines
D. Consistency of scale along certain lines (this multiple choice question has been scrambled)

What do azimuthal projections preserve?
A. Local angles and shapes
B. Areas
C. Consistency of scale along certain lines
D. Certain accurate directions
D. Certain accurate directions (this multiple choice question has been scrambled)

What is the standard line?
The line of tangency between the projection surface and the reference globe; standard parallel if it follows a parallel, standard meridian if it follows a meridian.

What is the principal scale?
The scale of the reference globe.

What is the scale factor?
The normalized local scale, defined as the ratio of the local scale to the principal scale.

The projection file contains information on what 3 things?
The geographic coordinate system, the map projection parameters, and the linear unit.

What 3 purposes does a projection file serve?
Identifying a data set's coordinate system, input for projecting or reprojecting the data set, and be exported to other data sets that are based on the same coordinate system.

