The use of shadows to determine an objects height from aerial photographs is an essential part of satellite image interpretation. The length of the shadow is used to determine the height.
Orthophoto is a type of satellite imagery that has been adjusted using special devices. This kind of imagery is correct geometrically, this means it can be used to measure actual distances One notable fact about orthophoto is the fact that the side of the images can not be seen. The use of shadows to determine an objects height can compliment the geometrically accurate photos. That makes the shadow feature of a satellite image important to orthophotography.
