Black and white aerial photography is a type of remotely sensed imagery that allows for the mapping of landscape and ground cover via photography taken from aircraft and satellites. Changes to surface features such as vegetation can also be tracked via aerial photography. The USGS used aerial photographs to photograph the 50 States and most were taken with black-and-white film. The example above was taken by the USGS as part of the National Aerial Photography Program in August 1993 of the Golden Gate Bridge in San Francisco.
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