Elements of Remote Sensing

61. The various stages occuring in GPS system are described below:
1. Generation of an output to the user
2. Detection of the GPS signals
3. Processing the data in the built-in-computer
4. Decoding the GPS signal.
The correct sequence of the stages is:

1. 1, 2, 3, 4
2. 2, 3, 4, 1
3. 2, 4, 3, 1
4. 3, 1, 2 , 4

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62. Which one of the following attributes is not associated with digital maps

1. Colour
2. Symbology
3. Legends
4. South arrow

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63. Which one of the following errors is produced by platform characteristics of the sensor?

1. Altitude variation
2. Altitude
3. Orbit drift
4. All of these

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64. Which one of the following factors does not affect the scale of the air photographs?

1. Focal length
2. Flying height
3. Ground elevation
4. None of these

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65. Which one of the following frequency regions is a part of sun's radiation?

1. Ultraviolet frequency region
2. Infrared frequency region
3. Radio frequency region
4. All of these

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66. Which one of the following geometric errors of satellite sensors is random?

1. Scan skew
2. Panoramic distortion
3. Earth rotation
4. Altitude variation

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67. Which one of the following helps to identify the objects on the earth surface?

1. Atmospheric window
2. Signature
3. Radiometric error
4. None of these

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68. Which one of the following parameters is accurate for DGPS?

1. Positional accuracies ~ 1 - 2 m if rover is less than 1-2 km from the reference station
2. Positional accuracies ~ 2 - 5m if rover is less than 2-5 fm from the reference station
3. Positional accuracies ~ 5 - 10 m if rover is less than 5-10 km from reference station
4. Positional accuracies ~ 5 - 10 m if rover is less than 25 km

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69. Which one of the following parameters is considered to determine the reflectance of a vegetation canopy?

1. Solar zenith angle
2. Azimuth angle
3. Look angle
4. All of these

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