What do "local deviations" refer to in contour mapping?

"Local deviations" in contour mapping refer to smaller irregularities in the terrain that can affect the accuracy of contour representation. These nuances in the landscape can arise from various natural features such as small hills, depressions, or other terrain variations that are not necessarily significant enough to be categorized as major changes in elevation.

When creating contour maps, it is essential to consider these local deviations because they can influence the way contours are drawn. If these small features are not accurately represented, the contours may misrepresent the true shape and slope of the terrain. Therefore, recognizing and accounting for local deviations is critical for precise topographic mapping, ensuring that the contours accurately reflect the underlying landscape.

In contrast to local deviations, major changes in terrain elevations often lead to more significant contours that are easier to identify. Errors in contour lines could refer to inaccuracies in the drawing process rather than the natural features themselves, while average height differences focus on broader elevation changes rather than the fine details that local deviations encompass.