What does the operation "MOD(Contour, 5000) = 0" accomplish?

The operation "MOD(Contour, 5000) = 0" is used to identify contours that are multiples of 5000. The MOD function calculates the remainder when one number is divided by another. In this case, it checks if the remainder of each contour value when divided by 5000 is zero. When the result is zero, it indicates that the original contour value divides evenly by 5000, meaning it is a multiple of 5000.

This allows the selection of contours that occur at standard intervals—specifically, every 5000 units—such as 0, 5000, 10000, 15000, etc. Such a selection is particularly useful in geographic analysis for creating uniform intervals that can help in visualization, analysis of elevation changes, and other spatial queries.

The other options do not accurately describe what the MOD operation accomplishes. For instance, selecting all contours or only those with an exact value do not reflect the functionality of the MOD operation, which specifically identifies multiples rather than simply filtering for particular values or inclusivity.