ABSTRACT
Remote sensing is a method of obtaining information from distant objects without direct contact. This is possible due to the existence or the generation of force fields between the sensing device and the sensed object. Usable force fields are mechanical waves in solid matter (seismology) or in liquids (sound waves). But the principal force field used in remote sensing is that of electromagnetic energy, as characterized by the Maxwell equations. The emission of electromagnetic waves is suitable for directional separation. Thus, images of the radiation incident on a sensor may be generated and analysed.
