Remote sensing is the science (and to some extent ,art) of acquiring information about the Earth's surface without actually being in contact with it . This is done by sensing and recording reflected or emitted energy and processing, analyzing, and applying that information.”
In much of remote sensing, the process involves an interaction between incident radiation
and the targets of interest. This is exemplified by the use of imaging systems where the
following seven elements are involved. Note, however that remote sensing also involves the
sensing of emitted energy and the use of non-imaging sensors.
1. Energy Source or Illumination (A) - the first requirement for remote sensing is to have
an energy source which illuminates or provides electromagnetic energy to the target
of interest.
2. Radiation and the Atmosphere (B) - as the energy travels from its source to the
target, it will come in contact with and interact with the atmosphere it passes through. This
interaction may take place a second time as the energy travels from the target to the
sensor.
3. Interaction with the Target (C) - once the energy makes its way to the target through the
atmosphere, it interacts with the target depending on the properties of both the target and the
radiation.
4. Recording of Energy by the Sensor (D) - after the energy has been scattered by, or
emitted from the target, we require a sensor (remote - not in contact with the target) to collect
and record the electromagnetic radiation.
5. Transmission, Reception, and Processing (E) - the energy recorded by the sensor has
to be transmitted, often in electronic form, to a receiving and processing station where the
data are processed into an image (hardcopy and/or digital).
6. Interpretation and Analysis (F) - the processed image is interpreted, visually and/or
digitally or electronically, to extract information about the target which was illuminated.
7. Application (G) - the final element of the remote sensing process is achieved when we
apply the information we have been able to extract from the imagery about the target in order
to better understand it, reveal some new information, or assist in solving a particular problem.
These seven elements comprise the remote sensing process from beginning to end.
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