Which acronyms are listed as passive imagery sensors?

Which acronyms are listed as passive imagery sensors?

• A. VID, PID, CID, BHI, BDA
• B. VID, PID, CID
• C. BHI, BDA
• D. VID, CID, BDA

Answer: (A)

The main idea here is understanding what makes a sensor passive. Passive imagery sensors detect and measure light that comes from a scene—sunlight reflected off the Earth or ambient thermal radiation—without emitting any energy themselves. In MISR, imagery is gathered using such detectors across multiple wavelengths and viewing angles, relying entirely on this incoming light. All of the acronyms listed correspond to passive imaging sensors or channels used to capture MISR data. Since each one operates by sensing reflected light rather than generating illumination, they all fit the category of passive imagery sensors. That’s why the full set, including VID, PID, CID, BHI, and BDA, is the correct description. The other options would leave out one or more of these passive sensing pathways, which isn’t consistent with how MISR collects imagery.

The main idea here is understanding what makes a sensor passive. Passive imagery sensors detect and measure light that comes from a scene—sunlight reflected off the Earth or ambient thermal radiation—without emitting any energy themselves. In MISR, imagery is gathered using such detectors across multiple wavelengths and viewing angles, relying entirely on this incoming light.

All of the acronyms listed correspond to passive imaging sensors or channels used to capture MISR data. Since each one operates by sensing reflected light rather than generating illumination, they all fit the category of passive imagery sensors. That’s why the full set, including VID, PID, CID, BHI, and BDA, is the correct description. The other options would leave out one or more of these passive sensing pathways, which isn’t consistent with how MISR collects imagery.