The system that uses the Sun as a source of electromagnetic energy and records the naturally radiated and reflected energy from the object is called
- AGeographical Information System
- BGlobal Positioning System
- CPassive Remote SensingCorrect
- DActive Remote Sensing
Solution
Concept
Definition of passive remote sensing
Formula
NONE
Step-by-step solution
1. Passive remote sensing systems rely on naturally available external radiation sources. 2. The Sun is the primary source of natural electromagnetic radiation reflected or emitted by surface features. 3. Because the sensor records naturally reflected solar energy without emitting radiation, it is called passive remote sensing. Answer: C
Explanation
Passive remote sensing relies on naturally available electromagnetic radiation, such as sunlight reflected off Earth's surface or heat emitted from objects. Because the sensor does not emit its own energy signal and instead passively records natural solar radiation, it is called passive remote sensing.
Why the other options are wrong
A) GIS is a database system used for storing and analyzing spatial data. B) GPS is a satellite navigation system used for determining position coordinates. D) Active remote sensing emits its own energy source rather than using natural solar energy.
Shortcut
Passive remote sensing relies on natural radiation like the Sun; Active provides its own energy source.
Common mistake
Confusing passive remote sensing with active remote sensing, which supplies its own energy source.
Correct answer: C) Passive Remote Sensing