Digital Elevation Model (DEM) is an important topographic
product and essential demand for many applications.
Traditional methods for creating DEM are very
costly and time consuming because of land surveying. In
time, Photogrammetry has become one of the major methods
to generate DEM. Recently, airborne Light Detection
and Ranging (LiDAR) system has become a powerful way
to produce a DEM due to advantage of collecting
three-dimensional information very effectively over a large
area by means of precision and time [1]. However, the
main disadvantage of aerial manned platforms such as airplanes
is being expensive, especially for small study areas.
During the last decades, low-cost Unmanned Aerial