Question

What helps to identify objects on Earth's surface?

• A. Atmospheric window
• B. Spectral signature
• C. Radiometric calibration
• D. Spectral indices

Hint:

Remember: \[ \boxed{ \text{Spectral Signature} = \text{Unique reflectance pattern of an object} } \] It forms the basis of object identification in remote sensing.

Answer 1

The Correct Option is B

Concept: Different objects on the Earth's surface reflect and absorb electromagnetic radiation differently at various wavelengths. This unique pattern is known as the spectral signature of an object.

Step 1: Understand spectral signature. Every material such as vegetation, water, soil, and rocks has a characteristic reflectance curve. These unique reflectance patterns help distinguish one object from another.

Step 2: Identify the correct concept. Hence, \[ \boxed{\text{Objects are identified using their Spectral Signature}.} \] Therefore, the correct option is \[ \boxed{(B)\;\text{Spectral signature}.} \]