They can map over 79 thousand buildings in some of these surveys. This company basically takes the heat loss photos gathered from airplanes, and overlays it on a map.

http://www.hotmapping.co.uk/case-study/index.htm

This is important because there is a lot of heat loss from roofs and I suspect that even the windows contribute in these aerial photos. The company that took the aerial photo’s also specializes in many other thermal imaging applications, including water under roofing.

http://www.hortonlevi.co.uk/dampsurveys/default.htm

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