Which statement best describes the two core components of a remote sensing system?

• A. Sensor and Platform
• B. Orbital Element
• C. Image Processor
• D. Ground Station

Answer: (A)

The two essential parts of a remote sensing system are the sensor and the platform that carries it. The sensor is the device that detects energy reflected or emitted from the Earth's surface and converts it into electrical signals or digital data. It determines what wavelengths are sensed, how finely details are resolved, and what kind of data you get (optical, infrared, radar, etc.). The platform is the vehicle that hosts the sensor—such as a satellite, an aircraft, or a drone—and provides the vantage point, altitude, motion, and stability needed to collect data. The platform also sets the geometry of the data, including look angle and footprint size, as well as how often the same area can be revisited.

Orbital elements describe the path and dynamics of the platform in space, not the sensing hardware itself. An image processor is involved after data capture to turn raw signals into usable images, and a ground station handles communication and data distribution, but neither defines the sensing capability in the moment of data collection.