Black and white aerial photo

Black and white aerial photos are also used to to help distinguish features on the surface. Unlike infrared photography this type of photography lacks any color. It relies on the shades of gray to help bring out the characteristics of the land or of an object. These types of photographs can be good for seperating cultural landscapes from natural ones.

Link: http://www.ngs.noaa.gov/web/APOS2/image_tut.shtml