Remote sensing is commonly known to be the field that
deals with obtaining information about the surface of the Earth from a distant
place. The process is accomplished by sensing and recording reflected and
emitted energy. After that, that information can be processed analyzed and
applied for further use.
Mostly in remote sensing, the process involves interaction
between incident radiation and targets of interest. Remote sensing also uses
non imaging sensors and involves sensing emitted energy through different
techniques. The steps involving remote sensing can be broken down into different
The first requirement for remote sensing is to have a
constant energy emitting source. In our case, it’s the sun. Sunlight emitted
from the sun directly falls on the lands and water bodies. The latter phases
work after based on the reactance of the objects to this energy coming from the
As the energy from the sun travels to reach earth it has
to travel through the atmosphere and the different levels of it. As it goes
through it it, it interacts and radiates energy through it. The same process is
repeated while it returns after being reflected from the target object from
earth before reaching the satellite.
After reaching the area of interest the energy interacts
with the target object. After that the target object reacts to it, or emits
energy as well. This varies from material to material and depends on the
properties of the object. For example, soil and water don’t react the same way
to the radiation.
After the object reacts the procedure is reversed again. This
time the signal travels through the atmosphere whence it came through. To capture
this energy or radiation there are sensors in the satellite placed to capture
these signals. These signals are then later collected in the satellite and
converted to electrical form so that they can passed on to a different place to
perform analysis. Hence, they are sent to ground stations or to earth where the
can be processed and interpreted
In a nutshell, the light emitted from the sun falls on the
land and other infrastructures that are present. Based on their own
characteristics and properties they have their own reflectance and absorption patterns.
This is captured from the remote satelites. These imagery are used as raw
elements for performing our study.