This document discusses the advantages and disadvantages of remote sensing. Some key advantages include large area coverage allowing regional surveys, repetitive coverage enabling monitoring of dynamic themes, and data being acquired at different scales and resolutions. Disadvantages include remote sensing being expensive for small areas, requiring specialized training, and human errors potentially being introduced. The document provides 15 advantages and 9 disadvantages of remote sensing in detail.

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Sub:- Disaster Assessment Using
Geospatial Technique

2.  Branch :
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3. Presentation on
“Advantages and
Disadvantages of REMOTE
SENSING”

4. Why this Presentation .. ?
 Remote Sensing has several unique advantages as well
as some limitations also.
 It is essential to understand both the advantages and
limitations of remote sensing, to use it more
effectively.

5. Introduction
 Remote Sensing :-
Remote Sensing is the science and art of
obtaining information about an object, area or phenomena,
through the analysis of data acquired by a device, that is not in
contact with the object, area or phenomena under
investigation.
Remote Sensing is the acquiring of data about
an object without touching it.

6. Advantages of Remote Sensing
1. Satellite images are permanent records, providing
useful information in various wavelengths.
2. Large area coverage enables regional surveys on a
variety of themes and identification of large
features.
3. Repetitive coverage allows monitoring of dynamic
themes like water, agriculture etc.

7. 4. Easy data acquisition at different scales and resolutions.
5. A single remotely sensed image can be analysed and
interpreted for different purposes and applications.
6. Amenability of remotely sensed data for fast processing
using a computer.

8. 7. Remote Sensing is unobstructive if the sensor is passively
recording the electromagnetic energy reflected from or
emitted by the phenomena of interest.
Thus, passive remote sensing does not disturb the
object or area of interest.
8. The images are analysed in the laboratory thus reducing
the amount of field work.

9. 9. Map revision at medium to small scales is economical and
faster.
10. Colour composite can be produced from three individual
band images, which provide better details of the area than
a single band image or aerial photograph.
11. Flods over a large region, or the forest fire can be located
from above and rescue planning can be immediately
arranged.

11. 12. the inaccessible areas like volcanic eruption, failure of
dam over river, etc. can be covered by the remote sensing
techniques to study the intensity of disaster.

12. 13. The data generated by remote sensing techniques can be
used for : land-use planning, forest development,
geological surveys, urban planning, disaster management.
14. Cheap and rapid method of constructing base maps in the
absence of detailed land surveys.

13. 15. It is the only practical way to obtain data from
inaccessible regions, e.g. Antarctica, Amazonia.

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TV show is over. What's on next isn't something you want to
watch, so you reach for the TV remote. That technology has
made life more convenient, This timeline will apprise you of
the important milestones in the invention of this amazing
Remote Sensing.

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want to spend the large investment required for a larger
scale vehicle, consider an indoor remote control helicopter.
An indoor remote control helicopter is a much smaller
version compared to the expensive models, and provides
just as much fun. The helicopters are capable of flying
outdoors like the bigger helicopters, but are able to fly
indoors as well, and the bigger helicopters are not. There
are a variety of choices in all different styles and types for
hours of fun.

17. Disadvantages of Remote sensing
1. Expensive for small areas, particularly for one time
analysis.
2. Requires specialized training for analysis of images.
3. Large scale engineering maps cannot be prepared
from satellite data.

18. 4. Aerial photographs are costly if repetitive photographs
are required to study the dynamic features.
5. Human beings select the most appropriate sensor to
collect the data, specify the resolution of the data,
calibrate the sensor, select the platform that will carry the
sensor, determine when the data will be collected and
specify how the data will be processed.
Thus, human method produced error may be
introduced.

19. 6. Powerful active remote sensing system, such as radars or
lasers that emit their own EMR (electromagnetic
radiation), can be intrusive and affect the phenomenon
being investigated.
7. Remote Sensing instruments often become uncalibrated,
resulting in uncalibrated remote sensing data.

20. 8. Distinct phenomena can be confused if they look the
same to the sensor, leading to classification error.
Example: artificial & natural grass in green light (but
infrared light can easily distinguish them).
9. Phenomena which were not meant to be measured (for
the application at hand) can interfere with the image and
must be accounted for. Examples for land cover
classification: atmospheric water vapor, sun vs. shadow
(these may be desirable in other applications).

21.  Remote Sensing science has various limitations. ‘Perhaps
the greatest limitation is that its utility is often oversold’.
 It is not a panacea that will provide all the information
needed for conducting physical, biological, or a science.
 It simply provides some spatial, spectral, and temporal
information.

22. Thank you.