A sensor that measures the emitted radiation of an object is an example of passive remote sensing.

Question

Quizplus · Accepted Answer

Passive remote sensing measures radiation that is naturally emitted or reflected from an object, without actively emitting any signals. Examples include thermal sensors that measure the heat radiation emitted by the Earth's surface, or optical sensors that detect the visible and infrared radiation reflected by vegetation. In contrast, active remote sensing involves transmitting signals towards an object and analyzing the signals that bounce back, such as with radar or lidar systems.

A Sensor That Measures the Emitted Radiation of an Object