Buildings can affect the surface albedo.
The percentage of incident radiation reflected by a system is known as albedo. While a perfect absorber would have an albedo of 0, a perfect reflector would have a value of 1.
A net albedo increase for urban areas of about 0.1 can be achieved by increasing the albedo of the roof and the pavement by about 0.25 and 0.10, respectively.
Many studies have shown that increasing roof reflectivity from 10% to about 60% results in energy savings for building cooling of more than 20%.
Albedo is a measure of how well surfaces reflect sunlight (heat from the sun). Large portions of the sun's rays are reflected back into the atmosphere by light-colored surfaces (high albedo). The sun's rays are absorbed by dark surfaces.
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