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When using radar to transit a dark rugged area, the pilot needs to recognize dangerous obstacles ahead from radar images. Since the radar image is displayed as range versus azimuth, the obstacles cannot be easily seen, and the heights of obstacles are especially difficult to determine. It is important to detect potential obstacles such as tall buildings so that the aircraft can avoid collision. Therefore, we investigated height reconstruction methods (including multi-scale wavelet and histogram analysis) on the extracted radar shadows formed by obstacles. Preliminary results indicated that height construction was successful even with long thin shadows embedded in a noisy radar image.