Question

Match List-I with List-II. List-I Terminology used in Remote sensing: A. Active sensing, B. Passive sensing, C. Spectral, D. Spatial. List-II Detail: I. When the sensing device detects EMR originating from another source primarily from sun, II. It is the change in reflectance or emission of objects as a function of wavelength, III. It is the arrangement of terrain features providing attributes such as shape, size and feature, IV. When the sensing device detects EMR at an object and detects the amount of that energy which is reflected back.

• A. A-IV, B-II, C-III, D-I
• B. A-I, B-II, C-III, D-IV
• C. A-III, B-II, C-I, D-IV
• D. A-IV, B-I, C-II, D-III

Hint:

Active sensing uses its own energy source, while passive sensing depends on natural radiation.

Answer 1

The Correct Option is D

Concept:
Remote sensing may be active or passive, and image interpretation uses spectral and spatial information.

Step 1: Active sensing.
Active sensing sends energy towards an object and detects the reflected energy. \[ A\rightarrow IV \]

Step 2: Passive sensing.
Passive sensing detects natural EMR, mainly from the sun, reflected by objects. \[ B\rightarrow I \]

Step 3: Spectral.
Spectral property refers to change in reflectance or emission with wavelength. \[ C\rightarrow II \]

Step 4: Spatial.
Spatial property relates to arrangement of terrain features such as shape, size and texture. \[ D\rightarrow III \] Therefore: \[ A-IV,\ B-I,\ C-II,\ D-III \] \[ \therefore \text{Correct Answer is (D)} \]