Geoid undulation, N, represents the separation between the ellipsoid and the geoid.

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Multiple Choice

Geoid undulation, N, represents the separation between the ellipsoid and the geoid.

Explanation:
The key idea is that the geoid undulation is the distance between the two reference surfaces used in height measurements: the reference ellipsoid and the geoid. At any location, the ellipsoidal height h measures how far the point is from the ellipsoid, while the orthometric height H measures how far the point is from the geoid. The geoid undulation N is the separation between those surfaces themselves, so N = h − H and h = H + N. This makes N the specific difference between the ellipsoid and the geoid, rather than the distance to either surface alone.

The key idea is that the geoid undulation is the distance between the two reference surfaces used in height measurements: the reference ellipsoid and the geoid. At any location, the ellipsoidal height h measures how far the point is from the ellipsoid, while the orthometric height H measures how far the point is from the geoid. The geoid undulation N is the separation between those surfaces themselves, so N = h − H and h = H + N. This makes N the specific difference between the ellipsoid and the geoid, rather than the distance to either surface alone.

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