What is the significance of using remote sensing in acquiring data?

Answer 1

Remote sensing is very efficient for acquiring data. Ultimately, remote sensing is taking measurements from a distance.

Let's say I task you wish measuring the heights of every tree in one square mile of forest. One option is to have you go out with measuring tools and measure every tree individually. This would require transportation, considerable time, and considerable effort.

Imagine LiDAR is used instead. Using a DEM and a point cloud, the height of each tree could quickly be determined. Now, we could use a drone, airplane, etc. to accomplish this task in much less time with much less effort.

Additionally, different spectrums of light can reveal trends not seen by eyes. For example, near-infrared light (invisible to the eye) is heavily reflected by healthy vegetation and detected by sensors.