The technology of aerial photography, photogrametry, has widespread applications in mapping and aerial surveying. A multi-billion-dollar industry, aerial surveying and mapping is "big business" in both civilian and military sectors. While the industry has grown increasingly automated, employment opportunities still exist for people with a basic appreciation for the technology, who often receive final training on the job. The activity described in this article brings the "aerial" aspects of aerial mapping and photography "down on earth." The activity simulates how someone would go about making estimates of the height of a subject above level ground from a single aerial photograph. (Contains 2 figures.)