Just as some vegetation grows in swamps others grow on sandy ridges. Agricultural crops may like certain conditions. Association is one of the most helpful clues in identifying man made installations. Aluminum manufacture requires large amounts of electrical energy. Absence of a power supply may rule out this industry.
Cement plants have rotary kilns.
Schools at different levels typically have characteristic playing fields, parking lots, and clusters of buildings in urban areas. Large farm silos typically indicate the presence of livestock. How tall a tree is can tell something about board feet. Shadow - Geologists like low sun angle photography because shadow patterns can help identify objects. Steeples and smoke stacks can cast shadows that can facilitate interpretations.