Photoclinometry is a technique used to measure the topography of an object using photography. Some synonyms for this term include photometry, photogrammetry, and phototopography. Photometry refers to the measurement of light intensity, while photogrammetry is the process of taking measurements from photographs. Phototopography involves the mapping of terrain using photographs. All three synonyms relate to the use of photography in measuring physical attributes of an object or terrain. They are important techniques used in fields such as cartography, geology, and archaeology to map and understand the surface features of the Earth and other celestial bodies.