Before revision: In geographic information systems, Digital Elevation Models (DEMs) are commonly processed using radial scanning based algorithms. These algorithms are particularly popular when calculating parameters whose magnitudes decrease with the distance squared such as those related to radio signals, sound waves , and human eyesight.
After revision: In geographic information systems, Digital Elevation Models (DEMs) are important datasets for modelling the line of sight, such as radio signals, sound waves , and human eyesight.