In this photograph of Washington, D.C. note the red color used to portray vegetation. Also note shape of Pentagon in lower portion of image. Closely tied to scale. Be careful with size because of the scale component. Nevertheless, within the same image size is an important clue.
Shadows portray the vertical component of a feature.
Taller features cast longer shadows than shorter features. For example, Devil's Tower has longer shadows than its surrounding trees. Also provide information about sun angle and time of day. Site and situation . The relationship of feature to its surrounding features provides clues towards its identity.