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A SEMINAR REPORT ON
REMOTE SENSING
INDEX
INTRODUCTION
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What is Remote Sensing
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The need for Education in Remote Sensing
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The Use Of Satellite Remote Sensing
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Introduction to Remote Sensing for
MEDICAL PURPOSES
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How is remote sensing useful
Conclusion
INTRODUCTION :Remote sensing is the science and art
of obtaining information about a
phenomenoa without being in contact
with it. Remote sensing deals with the
detection and measurement of
phenomena with devices sensitive to
electromagnetic energy such as:
Light (cameras and scanners)
Heat (thermal scanners)
Radio Waves (radar)
Remote sensing is one of a suite of tools
available to land managers that provides
up-to-date, detailed information about land
condition. Remote sensing uses
instruments mounted on satellites or in
planes to produce images or 'scenes' of the
Earth's surface.
What is Remote Sensing ?
The uniqueness of satellite remote sensing lies in its
ability to show large land areas and to detect features at
electromagnetic wavelengths which are not visible to the
human eye. Data from satellite images can show larger
areas than aerial survey data and, as a satellite regularly
passes over the same plot of land capturing new data each
time, changes in the land use and condition can be
routinely monitored In the Land Monitor project, satellite
images are being used to provide information on land
condition and the changes in that condition through time,
specifically salinity and the status of remnant vegetation,
to help farmers, environmental managers and planners
better manage the land.
The need for Education in Remote Sensing :-
Pollution, population growth exceeding
the support capability of the land, loss of
biodiversity and global climate change are
only few of the problems that face today’s
and tomorrow’s generations. Remote
sensing and related technologies can
contribute to our understanding of these
problems as well as tot eh implementation
of practical solutions
Meanwhile countries are becoming increasingly aware
that long term economic viability requires a balanced,
informed strategy for the exploitation of natural
resources forecasting agricultural yields, and
developing new energy sources.
In order to meet these challenges, we need professional
who are familiar with the capabilities and limitations of
the geospatial technologies. This includes researchers
who can develop new methodologies and applications,
as well as technicians and practitioners who can apply
proven techniques to specify problems.
Thus, it is more important than ever that remote
sensing educational programs provide an adequate
exposure to modern technologies, as well as solid
grounding in remote sensing theory and principles.
Medical Applications of
Remote Sensing
This can be seen as a peak in the green band in the
reflectance spectrum for green grass above. The
spectrum also shows that grass reflects even more
strongly in the infrared part of the spectrum. While this
can't be detected by the human eye, it can be detected
by an infrared sensor.Instruments mounted on satellites
detect and record the energy that has been reflected.
The detectors are sensitive to particular ranges of
wavelengths, called 'bands'. The satellite systems are
characterised by the bands at which they measure the
reflected energy. The Landsat TM satellite, which
provides the data used in this project, has bands at the
blue, green and red wavelengths in the visible part of
the spectrum .
Interpreting Image Displays :The satellite images, consist of numbers which
are measurements of the amount of energy that
has been reflected from the earth's surface in
different wavelength bands. Some of these
bands, such as the infrared bands which contain
so much information about vegetation growth
and condition, can't be seen with the human eye
The numbers recorded for the different satellite
bands are displayed in red, green and blue
colour guns on a computer screen.
When the red, green and blue bands of an image are assigned
to the same colours on the computer screen, a true-colour
image is formed. These images look like aerial photographs,
since they indicate the true colours of objects – green trees and
grass and brown soil. When mixtures of the visible and
infrared bands are assigned to the red, green and blue colours
on the computer, false-colour images are formed. In these
images, the different colours on the screen represent different
intensities in the wavelength bands that are assigned to each
screen colour.
As well as deciding which image band to assign to which
screen colour, choices can be made about how to relate the
range of numbers recorded by the satellite to the 256 levels of
each colour on the computer screen.0 The way the range of
digital numbers in the image is related to the computer colour
levels is called 'image enhancement'.
Introduction to Remote Sensing
for Agriculture :Remote sensing is the ability to measure the
properties of an object without touching
it. Almost all of the applications of remote
sensing to date have been based on observing
crops in distinct areas of the electromagnetic
spectrum. The spectrum is represented in the
figure below. Agricultural remote sensing is
commonly done in the visible, near-infrared and
thermal infrared portions of the spectrum;
however, new applications in the microwave area
are under development.
How is remote sensing useful :1--It provides a unique perspective from which to
observe large regions.
2--Sensors can measure energy at wavelengths which
are beyond the range of human vision (ultra-violet,
infrared, microwave).
3--Global monitoring is possible from nearly any site on
earth.
Remotely sensed images can be used for mineral
exploration, monitoring ocean currents, land use
planning, and monitoring the condition of forest and
agricultural areas. The uniqueness of satellite remote
sensing lies in its ability to show large land areas and to
detect features at electromagnetic wavelengths which are not
Example of Satellite Images :1.
Lake Superior
2.
Temperature Maps of the Great Lakes
3.
4.
5.
Mississippi River Flood
Surface Temperature Map of Lake Superior
Three Dimensional Images of Guatemalan
Volcanoes
Conclusion :Remote sensing provides a cost-effective
method for mapping and monitoring broad
areas, and has the advantage that the spread
of diseases such as dieback is not enhanced
by remote monitoring. Archived data can be
used to monitor how areas have changed
through time.