What is "rephotography"

n. A form of photography in which the same site is photographed at two separate points in time, "then and now".

Rephotography is the act of repeat photography of the same site, with a time lag between the two images; a "then and now" view of a particular area. Some are casual, usually taken from the same view point but without regard to season, lens coverage or framing. Some are very precise and involve a careful study of the original image.