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ID: 112939 • Letter: I
Question
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The first question can not be answered due to the poor quality of the photograph.
Answer of the second question
Remote sensing systems are categorized on the basis of source of energy used for acquiring the satellite data. There are generally two types of RS systems :
Passive remote sensing systems in which uses the sun's energy to illuminate the object at the surface of Earth. This can only take place during daytime as light reflected from the surface get detected at the sensors while emitted energy can also be detected.e.g. Landsat.
Active remote sensing systems are systems which use their own energy to illuminate the object at the surface of Earth. With the help of these sensors, data can be obtained at any time during the day or season. e.g. SAR (Synthetic Aperture Radar).
(Applications of Remote Sensing part include some reviewed questions covered in the class.)
Remote sensing plays many important role in physical geography, some very useful advantages of RS are defined below:
1. Land use land cover (LULC) change over time for an area can easily be determined by using satellite data of the extended period of time.
2. Remote Sensing data are used to make any types maps of an area. So with the advent of RS cartography has become easier.
3. Remote Sensing has proved to be very helpful to study large and inaccessible areas in the very short period of time, such as mountains, forest area, and the area occupied by any militant group. Topography and the course of the rivers can be studied explicitly.
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