What is space archeology, anyway?

'Space archeology' conjures up a Star Trek-like visionof examining alien civilizations in distant galaxies.

In reality, it's not so much about turning our eyes outward,as delving deep intohistory, usingsatellite imagery to reveal ancient sites often hidden to our human eye.

Sarah Parcak is a pioneer in the field, who has literally written the book on the subject:Satellite Remote Sensing for Archeology.The archeologist and professor at the University of Alabama at Birmingham has used the techniques to uncovercountless finds such as pyramids and other Egyptian ruins.

Parcak, a National Geographic Fellow,also won the 2016 TED prize, $1-million towards building a crowdsourcing space archeology platform she dubs GlobalXplorer.

• On the trail of the Vikings: the latest search for the Norse in Newfoundland

Parcakis now applying her knowledge in an attempt to pin down Viking settlements in Newfoundland, and spoketo the CBC while at the Norse archeological dig in Point Rosee, on the province's southwest coast, in August 2016.

This Q&A has been edited and condensed.

The technology itself how does this work?

With the human eye, there's a lot we can see,but we're restricted to the visible part of the light spectrum. The great thing about satellites is they record information in the part of the light spectrum we can't see: near infrared, middle infrared, thermal infrared, and of course, radar.

And there are so many things on the Earth's surface that we think look one way, visually, but when you process the imagery using the infrared or middle infrared, all of a sudden you see these vibrant colours and signatures showing individual plant species, or particular kinds of rocks, that all look the same to us. That's really the magic of remote sensing. It allows us to manipulate the data, and see things as they actually are.

Lifting history to the surface of the image, almost?

That's right. What's buried just under the ground affects overlaying vegetation, soil.It can even hold moisture in different ways. Those are things you can only see using different parts of the light spectrum and by processing the imagery.

Do the images that you get back from the satellites look different, when you're comparing Norse, as opposed to something in Egypt?

Everything we do with imagery depends on where we're working, even down to the kinds of imagery that we order. People think oh, you get an image, download it, and process it. That's not the way it works. You typically have to study the landscape where you're going to beworking in detail, You have to understand local geology, soils, vegetation, the temporal nature of what you're dealing with there's wet times of year, there's dry times of year and that's going to affect how you can interpret your imagery. We do a lot of study before we even begin a project.Even before we study the archeology, you've got to understand the environment if you're going to be analyzing the imagery properly.

You've found how many sites?

At this point,I've lost track. There are so many sites out there. As human beings, we've been around for 100,000-plusyears. And think about all the places we've been and all the cities that we've built over time. We have been everywhere it's possible to be, and even lived in places where today we go, 'how could we have lived there, hundreds of thousands of years ago?'But it just shows you the scale of what's left to find.

How do you think using that term, 'space archeology', has helped create accessibility to the public?

Ithink the reason Ilike using the term 'space archeology'is that it pulls in two things that kids like: space, and archeology. And it kind of gives them a sense of the type of work we do. AndIkeep having to tell some people, no no no - it's not aliens, turn the cameras the other way.

Do you think itgives a little bit more sense of wonder to the whole field?

I think it does. Ithink right now, given the state of the world, and the challenges we're facing with government funding, both in Canada and the U.S. and in Europe, anything we can do to engage the public more actively, and get them excited, while still maintaining and honouring the science of what we do is really important. Because ultimately the majority of my funding comes from public sources.

Do you have any sense of how many people are working in the space archeology field, besides yourself?

When Istarted doing thiswork, about 15 years ago, there weren't as many.I'd say definitely in the hundreds now. There were maybe a few dozen people doing it 15 years ago. so the field has definitely grown.

How has space archeology evolved over 15 years?

Ithink we can say nowI'm very comfortable saying thisit's become much more a standard approach. An archeologist typically wouldn't go into the field, especially if they're doing a survey project, without having done remote sensing work prior to that.

Is there any downside to having so much more of theworld mapped and exposed?

Certainly.Isuspect that looters are using open source tools like GoogleEarth. Iget images from time to time from very sketchy email accounts, saying 'is this a feature?' and Ijust wonder.Ican't accuse, but it's suggestive that perhaps nefarious individuals are using it. Ithink like anything,with greater access and information, come greater responsibilities. We're able to see so much more of the world now than we ever could.

Aproject that I'm working on via the TED prizes, we're about to launch a crowdsourcing platform,a citizen science platform to allow anyone in the world to engage with finding archeological sites.What we're doing is, unlike GoogleEarth, there's no latitude or longitude information:you're just going to get a small area to look. So there's ways of masking that data, to help protect sites.Ithink we just need to think a little bit differently. How is it we can use this data in the best possible way to protect archeological sites and enhance heritage, rather than threaten it?

There's a real innate sense of responsibility that goes along with this.

Very much so. The last thing Iwant to do is publish a paper that shows an area of Egypt that's rich in tombs that says, 'look at where I found all these new tombs!' That would just be the height of irresponsibility on my part. But I can certainly clip and mask the image and say, 'this is an image of a site south of Cairo.' Good luck finding it.

Most people are pretty good, and are interested in history and archeology and want to help.But there is that fraction of a percent element that is looting and damaging sites,and they're happy to get their hands on good data on where sites are. We're trying to be much more responsible.

To watch Reg Sherren'sstory about the dig by Parcak and her team at Point Rosee, N.L. click on the link below.

On the trail of the Vikings

8 years ago

Duration 12:31

Archaeologists are hoping to prove that a second Viking settlement existed in Point Rosee, Newfoundland.