What does "remote sensing" involve?

Remote sensing involves the acquisition of information from a distance, typically using satellite or aerial imagery. This technology allows researchers and scientists to gather data about the Earth's surface without making physical contact. By capturing images and data from various wavelengths of light, remote sensing is crucial for monitoring environmental changes, urban development, land use, and various natural phenomena.

The other options provided do not accurately reflect the concept of remote sensing. The direct observation of human behaviors focuses on in-person studies and direct social interactions, which is opposed to gathering information from afar. The measurement of groundwater sources pertains more specifically to groundwater studies and hydrology, rather than the broader applications of remote sensing. Finally, the collection of data through surveys usually involves direct interactions with respondents to gather qualitative or quantitative information, distinguishing it from the passive, distance-based data gathering of remote sensing.