Skip to main content
U.S. flag

An official website of the United States government

Remote Sensing Coastal Change Glossary

0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z



LIDAR, or light ranging and detection, uses light in the form of a pulsed laser to measure variable distances to the Earth. These light pulses—combined with other data recorded by the airborne system—generate precise, three-dimensional information about the shape of the Earth and its surface characteristics.



Orthomosaics are high-resolution images made by combining many smaller images called orthophotos. An orthophoto is an aerial photo that has been corrected for lens distortion, camera tilt, perspective, and changes in the elevation of the earth’s surface.



Structure-from-motion, or SfM, is a three-dimensional coordinate measuring technique that utilizes a series of 2-dimensional images to reconstruct the 3-dimensional structure of a scene or object.