Spectral remote sensing is an amazing science that lets you detect qualities of objects from a distance. It is based on the fact that different surface features reflect or absorb the sun’s radiation in different ways.
The truth is that remote sensing can be a bit difficult to comprehend… But not any longer. This video from National Ecological Observatory Network (NEON) is explaining the most complex aspects of the science in an easy to understand way. Take a look. It’s worth it.