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WEEK: 10
TOPIC: INTRODUCTORY GEOGRAPHIC INFORMATION SYSTEM.
CONTENT: SATELLITE REMOTE SENSING
- a) DEFINITION OF CONCEPTS
i). Remote sensing
ii). Satellite
iii). Satellite remote sensing
- b) APPLICATION OF SATELLITE REMOTE SENSING
- c) RELATIONSHIP BETWEEN GIS AND REMOTE SENSING
SUB- TOPIC 1: REMOTE SENSONING:
Remote sensing can be defined as perception and recording of phenomena by devices which are not in contact with them. In the broadest sense remote sensing includes techniques used in geographical surveys to probe the earth’s crust and in oceanographic surveys of the ocean floor. This term of recording and analyzes the characteristics of earthly phenomena by air – borne devices that are carried in balloons, air craft, helicopters, satellites and space craft.
Remote sensing can also be defined as the process of obtaining information about land, water or object without physical contact between the sensor and the object of analysis.
- II) SATELLITE:
Satellites are objects purposely placed into orbit around earth, other planet or the sun. Moon is a natural satellite of the earth. Artificial satellites are objects made by man placed in orbit around the earth. The first satellite was launched in 1957.Today’s artificial satellites play key roles in communication industry, in military intelligence and scientific study of both earth and outer space.
III) SATELLITE REMOTE SENSING:
These are satellites carrying remote sensing devices placed on the orbits of the earth. Between
1990 and 1996 more than remote sensing satellites have been placed into orbits which have produced stereos images useful, for topographic mapping. Remote sensing is changing rapidly. Some satellites carry instruments that can constantly providing images of objects as small as an automobile and constantly improving technology promises even better resolution in the near future.
EVALUATION:
1) Explain the word remote sensing.
2) Briefly write short note on i) Satellite ii) Satellite remote sensing.
SUB – TOPIC 2: APPLICATION OF SATELLITE REMOTE SENSING.
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