August 18, 1984 (JiaZi July 22), plotted as a precise map of the Great Wall in Beijing.

map of Beijing has been unable to accurately complete indicate the whole trend of the Great Wall, distribution, and damage to the circumstances. Using aerial remote sensing technology, from aerial photographs generally find out the basic situation, in addition to the quantitative statistics destroy the serious part of the Great Wall 66% of the total length, but also in the military are mountains area, tied five segments of the Great Wall , substantially east-west The one trunk Great Wall, after the Badaling over Gubeikou, Trans-Yanshan Mountains. Over in Beijing, the overall deployment of aerial remote sensing flight, flying accumulated four thousand square kilometers area, thousands of color, black-and-white aerial photographs and color infrared photos, In addition, there are multi-spectral and infrared scanning tape number plate. According to these information, one after another draw maps for urban planning, environmental protection, geology, landscape, agriculture, and water conservancy. Such as the total length of the Great Wall in Beijing, the Great Wall, a total number of seat mark, City Desk, Great Wall damaged condition classification, etc. at a glance on the map.