CSIR-NET 2014
98. In a side-looking radar image of a mountain region , which of the following is true?
A) Lower the depression angle, shadow is the phenomenon
B) Higher the depression angle, layover is the phenomenon
C) Higher the depression angle, forshortening is the phenomenon
D) Lower the depression angle, forshortening is the phenomenon
Answer:C
Explanation:
The curvature of a transmitted radar pulse causes the top of a tall
vertical feature to reflect energy advances of it base, which results
in displacement of the top towards the near range on the image,
this distortion is called foreshortening or image layover.
vertical feature to reflect energy advances of it base, which results
in displacement of the top towards the near range on the image,
this distortion is called foreshortening or image layover.
1. Height of targets
higher features are foreshortened more than
lower features.
lower features.
2. Radar depression
angle features imaged with steep (large)
depression angles are foreshortened more than those acquired with
shallow (small) depression angle
depression angles are foreshortened more than those acquired with
shallow (small) depression angle
1. Kiran 5ft tall and,standing 3ft away form a spot on his kitchen floor then what is the angle of depression?
Solution:
The angle of
depression is the angle between the horizontal and
your line of sight (when looking down)
your line of sight (when looking down)
tanθ
= opposite / adjacent
tanθ
= 5/ 3
tanθ
= 1.66
θ
= tan-1
(1.66)
θ=
59.089˚
Therefore
Depression angle θ=
59.089˚
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