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Using 3D is 2nd Nature to Scientists


If scientists can't get to Mars in person, seeing it through three-dimensional (3-D) imagery is the next best thing. Thanks to FIDO's cameras, called "stereo pairs," which enable the creation of three-dimensional images, the science team is able to learn more about the terrain and geologic processes that formed the area than they could with only two-dimensional (2-D) images.

Nathalie Cabrol

"If your work is limited to 2-D images," explains Nathalie Cabrol, "the problem is that you don't get an understanding of the volume or shape of objects or terrain." Nathalie is a geologist from SETI Institute located at NASA Ames Research Center who uses 3-D imagery almost daily. Through 3-D imagery, geologists can observe the geometry of an object, which will tell something about the processes that formed and affected that object. For instance, if the object from the 3-D image looks rounded or smooth, it could have been weathered over time by water. If it is irregular and scoured, perhaps a glacier or volcano was responsible.

"During the FIDO test today we're looking at outcrops," says Nathalie. "Looking at them in the 3-D image tells me where there is an actual protrusion and where my brain is playing tricks on a 2-D image. Yesterday, I was researching the tops of some valley walls that looked like tight catwalks. It was really hard to see their thickness from a 2-D image. When I put the 3-D glasses on, I could see enormous protrusions and discovered that the catwalks were actually sturdy and robust layers that must have been formed over many years."

Three-dimensional imagery is also very important when planning a traverse because it allows you to understand the slope or gradation the rover might encounter. If a slope is too steep or the ground is too loose, it might be too dangerous for the rover to climb it. Although you can see slopes in 2-D images, a 3-D image allows for greater accuracy and an even better understanding of the materials that make up the slope.

Nathalie has had many experiences that have convinced her of the necessity of acquiring images in 3-D. If she's not using 3-D imagery, she's out in the real word. She does research in the field of planetary aqueous environments and their analogs (equivalents) on Earth. For example, Bolivia is home to the highest lake on Earth, which is 20,000 feet (6,000 meters) above sea level. This area resembles ancient lakebeds on Mars because it is a volcanic environment that is usually covered by ice and heated by thermal hot springs. Like Mars, it has a thinner atmosphere and experiences high radiation and low oxygen levels.

"Using the glasses are second-nature to us, and we can really get a feel for what it's like on Mars." Three-dimensional images are "a good substitute for being in the field," says Nathalie, "but if I had my choice, I'd be in the field myself."



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Last Updated: 17 August 2002

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