Black and white film records the reflected radiation in tones of gray, while color film records it in color. The advantage to the use of color is that the human eye cab discriminate between many more shades of color than it can shades of gray. Objects that reflect primarily blue appear black, objects that reflect green appear blue, and objects that reflect red appear green. The primary use of color infrared photography is in vegetation studies. This is because healthy green vegetation is a very strong reflector of infrared radiation and appears bright red on color infrared photographs.
Aerial photography is a kind of remote sensing.
Aerial photos are photgraphs taken from the sky, looking down on the earth. They are usually taken from an airplane. Rather than being a drawing, which is what a map is, they record reflected radiation on film. They contain radial distortion. Aerial photos are used for mapping, land use planning, and monitoring environmental change over time.