ABSTRACT
Often aerial imagery possesses distortions that are a result of the aircraft’s position, relationship to the ground, and changes in the terrain below the plane. The process of orthorectification is useful for removing any image perspective effects (such as tilt) and displacements created by the terrain to create what is known as an orthophoto. The orthophotos are planimetrically accurate. This means that scale is constant across the image. This planimetric correction allows orthophotos to be used as base maps, which are common in a wide variety of Geographical Information System (GIS) applications. This exercise will orthorectify a single digital image based on the relative positions of the camera fiducial marks as well as information from the camera calibration report. This procedure represents some of the fundamental techniques often used in digital photogrammetry applications.
