Fundamentals of Remote Sensing

Remote sensing is a study of process, object, or phenomena without being in physical contact with it. The simplest example of remote sensing in daily hfe is viewing the screen of your computer monitor (Fig. 1). 

A physical quantity (light) emanates from the screen, which is a source of radiation. The radiated hght passes over a distance, and thus is remote to some extent, until it is encountered and captured by the sensor (your eyes). Each eye sends a signal to a processor (your brain) which records the data and interprets this into information. Several of the human senses gather their awareness of the external world almost entirely by perceiving a variety of signals, either emitted or reflected, actively or passively, from objects that transmit this information in waves or pulses. 

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E. Schanda Physical Fundamentals of Remote Sensing (Springer, Berlin, Heidelberg 1986)... 

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