Black & White Aerial Photos are sensitive to Black and White light. They are similar to Infrared Aerial Photos by they show only light that we can perceive. Certain features are less distinguishable in Black & White Aerial Photos versus Infrared. Vegetation variations are easier to see with Infrared Aerial Photos.
The map shown is a Black and White Aerial Photo of San Diego. The Black and White Photo only shows light that the human eye can perceive.
http://eros.usgs.gov/#/Find_Data/Products_and_Data_Available/NAPP
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