The Process and Elements of Remote Sensing
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.
