Question

The primary objective of the NISAR mission is to:

• A. Provide high-resolution optical imagery for urban mapping
• B. Measure Earth surface changes using dual-frequency radar
• C. Monitor carbon emissions
• D. Support satellite communication services

Hint:

Remember: \[ \boxed{ \text{NISAR} = \text{NASA--ISRO Synthetic Aperture Radar} } \] It uses both L-band and S-band SAR for Earth observation.

Answer 1

The Correct Option is B

Concept: NISAR (NASA--ISRO Synthetic Aperture Radar) is a joint Earth observation mission developed by NASA and ISRO. It employs dual-frequency Synthetic Aperture Radar (L-band and S-band) to monitor changes in the Earth's surface.

Step 1: Understand the mission objective. NISAR is designed to
• Monitor land deformation.
• Measure earthquakes and volcanoes.
• Observe glaciers and ice sheets.
• Study forests and ecosystem changes.

Step 2: Identify the correct objective. Hence, \[ \boxed{\text{NISAR measures Earth surface changes using dual-frequency radar}.} \] Therefore, the correct option is \[ \boxed{(B).} \]