Matteoo Luccio in sensorsandsystems.com 1 July 2014
One of the more impressive earth observation achievements in recent years was the collaboration between Google and the University of Maryland to create a global forest change assessment and visualization. This effort was unprecedented in terms of the raw computing power applied to the substantial Landsat archive, and yielding results that opened a lot of eyes to the change occurring around the globe. Sensors & Systems (S&S) special correspondent Matteo Luccio recently interviewed professor Matthew C. Hansen of the Department of Geographical Sciences at the University of Maryland about this effort that he spearheaded as well as the state of earth observation, global monitoring, and the need for Big-Earth sustainability efforts.
S&S: What first inspired you to become a scientist? Why did you specialize in remote sensing?
Hansen: I was into service. I was a Peace Corp volunteer in Zaire and was trained as an engineer. I did fish farming. When I came back from the Peace Corp I decided to go into geography for the simple fact that I like the spatial domain; in particular, I like atlases. I didn’t even know what kind of job you could get in geography, but I knew that I had a natural inclination for it. Within geography, I wanted to do something applied, not basic science. I chose remote sensing, which is very applied: you can clearly see what’s happening at a large scale with landscapes, land use, the way cities grow, the natural hazards therein, the way croplands are healthy or not, the way forest resources are used—it’s just a whole great perspective. My analytical or scientific background, coupled with the idea that this could be a really nice applied information domain, is how I got into it, but the key thing is that it was spatial.
S&S: What is your definition of geography? What is remote sensing’s role in the study of geography?
Hansen: For me geography is the study of space to understand how we interact with the natural world. It’s coming from the human perspective, because we are the biggest change agents on the face of the Earth. When I was growing up, they said, “The only object you can see from space is the Great Wall of China.” Actually, all you can see from space is human activity. What’s not modified by humans is a more appropriate question, and there’s very little of that. So, for me it’s the study of the natural space and, more importantly, how humans interact with it. It’s analogous to history, except in space: history is to time what geography is to space. It’s too big a field, really.
Remote sensing gives us a really good, internally-consistent set of facts from which we can quantify these different changing things in geographical space. So, this is a beautiful, wall-to-wall kind of dataset that is not influenced by other strange things that you might find in a set of samples. It is clean. It is a physical, quantitative, wall-to-wall measurement of the Earth. It’s just awesome.
S&S: Compared to 25 or 50 years ago, have only the tools changed or have the tools—GPS, GIS, advances in remote sensing, etc.—dramatically changed geography as a field of study and as a profession?
Hansen: There is no question that we have more data, more information, more analytical and quantitative tools at our disposal. Some geographers think that if you do GIS or remote sensing you’re just a technician. No, these are information domains that allow us to more quantitatively approach geographical problems and answer them. We can ask more questions knowing that we have better data sources and better tools to examine those data. It has changed the way we ask and answer questions, but I think it’s also been a bit disruptive. Some of the more traditional people think quantitative tools and approaches are not legitimate geography, and I think that’s wrong. For sure, it’s made the discipline more valuable, the degree more valuable, because you can go out into the real world, in government, civil society, the commercial side, and solve real problems, study markets and connectivity and things like that. The new tools and data have made geography incredibly more relevant to the real world.
- See more at: http://www.sensorsandsystems.com/dialog/interviews/34284-going-beyond-global-forest-change-modeling-toward-big-earth-system-sustainability.html#sthash.aMkj54Xt.dpuf