Multiple choice technology

In geographic information science a "datum" refers to

  1. a single piece of data

  2. any large collection of geographic data

  3. all of the census data for a particular year

  4. an attempt to accurately measure the shape of the earth's surface and locations on that surface, either locally or globally
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A geodetic datum is a reference system that defines the Earth's shape (ellipsoid) and anchors coordinate positions to the surface. It's not a single data point (A), a collection (B), or census data (C) - those are just data, not the reference framework itself.

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