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Sub:- Disaster Assessment Using Geospatial Technique

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Presentation on

“Advantages and Disadvantages of

REMOTE SENSING”

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.

Why this Presentation .. ?

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.

Introduction

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.

Advantages of Remote Sensing

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.

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. 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.

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.

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.

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

You're sitting comfortably on your sofa, and your favourite 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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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.

Disadvantages of Remote sensing

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.

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.

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).

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.

Thank you.