A related problem is relief displacement. A topographic high or low and a point on level ground will make contact with the same wavefront at the same time. The distance between that point and the start of the slope decrease with distance from the center. When the distance is large, layover, the slopes are spread out and the features reduced. When the distance is small, foreshortening, the slopes are shrunk and the features are exaggerated.
Relief creates large shadows in radar imagery.
Since the top of a feature is detected first relief displacement is inward, toward the path of the platform, because it is a function of height, imaging the same path at different altitudes creates parallax. Thus, you can produce stereo pairs. Stereo imagery makes mapping contours much easier. Pitch and roll distortion can be compensated by flexible mounts with stabilizing mechanisms, but movement off path, drift, and back onto path, crab, can only be removed during processing. There are both pros and cons to being close to your target.