What term describes the remote sensor that is pointed straight down from the aircraft, perpendicular to Earth's surface?

What term describes the remote sensor that is pointed straight down from the aircraft, perpendicular to Earth's surface?

• A. Zenith
• B. Aft
• C. Nadir
• D. Fore

Answer: (C)

The concept is how a sensor is oriented relative to the ground. A remote sensor pointed straight down from the aircraft, perpendicular to Earth's surface, is called the nadir. Nadir means the direction toward the ground, the opposite of zenith, which is straight up toward the sky. Fore and aft describe directions along the aircraft’s length—toward the front (nose) or the back (tail). Using a nadir orientation helps produce vertically aligned imagery with minimal perspective distortion, which is common in mapping and remote sensing data collection.

The concept is how a sensor is oriented relative to the ground. A remote sensor pointed straight down from the aircraft, perpendicular to Earth's surface, is called the nadir. Nadir means the direction toward the ground, the opposite of zenith, which is straight up toward the sky. Fore and aft describe directions along the aircraft’s length—toward the front (nose) or the back (tail). Using a nadir orientation helps produce vertically aligned imagery with minimal perspective distortion, which is common in mapping and remote sensing data collection.