Remote Sensing
Remote sensing is a
way of acquiring information about the surface of the earth without actually
being in contact with it.
Remote sensing is
done by receiving and recording energy that is either emitted or reflected by
the surface of the earth, so there must be a source of electromagnetic energy,
a target, and a sensor. The source can be the sun or a satellite, depending on
the type of energy being monitored.
Passive remote
sensing depends on natural energy such as sunlight that is reflected off the
surface of the earth or heat that is emitted from the surface of the earth.
Active remote sensing uses energy emitted by satellites and reflected back to
the satellites from the surface of the earth.
Why has Remote Sensing being developed?
Remote sensing has a very long history dating back to the end
of the 19th century when cameras were first made airborne using balloons and
kites. The advent of aircraft further enhanced the opportunities to take
photographs from the air. It was realized that the airborne perspective gave a
completely different view to that which was available from the ground.
Process of Remote
Sensing
(A)
Energy Source or Illumination
(B)
Radiation and the Atmosphere
(C)
Interaction with the Target
(D)
Recording of Energy by the Sensor
(E)
Transmission, Reception, and
Processing
(F)
Interpretation and Analysis
(G) Application
Introduction to Electrical Engineering
Electrical engineering
is a field of engineering that generally deals with the study and application
of electricity, electronics, and electromagnetism. This field first became an
identifiable occupation in the latter half of the 19th century after
commercialization of the electric telegraph, the telephone, and electric power
distribution and use. Subsequently, broadcasting and recording media made electronics
part of daily life.
Applications of Remote Sensing in Electrical Engineering
Measuring wind speed and
direction for wind farms, weather forecasting and surfers
Golfers, farmers, pilots, engineers and wind turbine
planners need accurate wind information. Weather balloons and GPS are a good
way to do this. But it’s not the only way. NASA’s QuickSCAT scatterometer and
wind LiDAR are making these large-scale wind observations too. And these tools are working
on the principle of remote sensing.
Plantation of solar panels
If we have to choose a
single location anywhere on Earth to install a solar panel, it would have to be
the Global Horizontal Irradiance (GHI) map. GHI measures the rate of total
incoming solar energy at the Earth’s surface in watts per square kilometer.
Decades of satellite data (derived from GOES and Meteosat) has generated this
data with a standard error of only 5%. This remote sensing data brings some
serious heat and measurments which are helpful for deciding the location for
solar plant installation.
Plantation of Telecom Towers
It’s estimated that 87%
of the world population now use mobile devices. The astounding rate of growth
in this industry requires extensive planning for optimal network capacity.
Telecommunications companies are using remote sensing as a cost-effective way
to optimize capacity requirements. Radio frequency coverage can be augmented
with the appropriate antenna type, location and direction. Satellite-derived
terrain, land use and other environmental factors can be modeled to achieve
optimal network capacity.
Windmills And hydel power plants
Windmills and hydel power plants are essential for
the production of electricity and they can be very useful if they are installed
at the right place. We can get maximum advantage of remote sensing by inquiring
the land and that would be very useful because once installed at the right
place we can get full benefit of these power plants.
En-routing of airplanes
In today’s world routing of airplanes is done by
remote sensing. Advanced tools have been developed which are being used in the
airplanes. And with the help of which we can get our point by point location.
We can set our desired routes and can easily manage the air traffic.
Plantation of Power lines
Trees can damage and break power lines and underground
cables. Broken power lines and cables are dangerous and costly to repair. Like
tress there are many other obstacles which can harm the transmission lines. So,
by remote sensing we can first survey the area properly and then we can avoid
these types of hazards and can safely plant power lines. And we can also sort
out shortest and safest routes using this technique or the tools working on the
principle of remote sensing.
Controlling Traffic Signals
Our increasing population and urbanization has led
to increasing amount of traffic in urban areas. Traffic jams mean waste of fuel
and time. Ground measuring systems provide extremely precise traffic volumes
but it’s limited to selected roads. Traffic density is being monitored using
change detection. Traffic analyst can compare two satellite images with slight
lags. This shows traffic movement over a large picture.
Well explained
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