What Is Earth Observation?

Earth observation is a field that we keep talking about every other day. It's not just pictures of earth, although that is the predominant om like where people spend their money and earth observation. Observation connotes visible images, like you're observing the earth. But it's all types of instrumentation. And there's actually right now as an interesting time to be talking bou it because there's a bunch of technologies that are sort of just on the horizon or just being really commercialized.