This module provides an introduction to the concepts that provide the basis for remote sensing technology and analysis. In the next module we will be applying your understanding of module II topics in order to explain how remote sensing technologies work. As you observe objects in your day-to-day life, consider how you are able to sense color and how visible wavelengths must be interacting with the object to produce the color that you are seeing. How different would the world appear if we could sense other types of waves with our eyes?