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Earlier this week, two teams from Google strapped on sophisticated backpacks jammed with cameras, gyroscopes and other gadgets and descended to the bottom of the Grand Canyon. It's the first step in a mission to take its street view maps off-road. NPR's Steve Henn reports.

STEVE HENN, BYLINE: Google is going into the wild. It's setting out to photograph and map the wilderness. So earlier this week, Luc Vincent, who runs Google's Street View, met up with a small group of reporters on the South Rim of the Grand Canyon.

Describe what's strapped to your back.

LUC VINCENT: So to my back, is strapped, a backpack with a towering set of cameras arranged in a soccer ball configuration, about two feet over my shoulders. So that clears my head when it takes pictures.

HENN: It's called Google Trekker. And when you look at this thing it looks like it would be top-heavy and you'd be, you know, struggling and likely to fall over.

VINCENT: It's not too bad. I mean, the batteries are at the bottom, so it sort of compensates for the top-heavy of the camera on top. I've skied with it to test it this winter. It was fine.

HENN: But this is the Trekker's first real trip. It has 15 specially designed lenses looking out in every direction. They're carefully set inside a brightly colored metal ball. And on top of that, there are two black bumps holding the Trekker's twin GPS receivers. And this soccer ball-like thing sits high on a metal frame up in the air above Luc's head, so it has a clear view of everything around him.

Google plans to use these Trekkers to map and photograph places its Street View cars and even its Street View tricycles can't reach. And that's what's brought Luc's team here to the top of the Grand Canyon.

VINCENT: This is iconic. This is where we have to go first. And I love being here.

HENN: The sun isn't up, but Luc's so excited he's bouncing on the balls of his feet, even with 40 pounds of gadgets strapped to his back.

VINCENT: First of all, I feel awesome to be here. It's like we've e been working towards taking, you know, this technology to the trails for a long time. I want to go places where we can't go anywhere but by foot.

HENN: Google is sending two teams down. James Hoffacker(ph) boots up an Android phone that's attached to the other Trekker making the trip.

JAMES HOFFACKER: This is the uplink to control the unit. And this phone right here is just powered on for you.

UNIDENTIFIED WOMAN: Connected to Trekker.

HOFFACKER: This is our link to the system and essentially tells us - it gives us, you know, battery power status of the system.

HENN: Ryan Falor runs special collections at Street View.

RYAN FALOR: James is one of the engineers on the Street View team that we recruited because he's one of the more athletically fit guys that carry all the gear down and back up for us.

HENN: Ryan says to make these maps of the back country each image will have to be tagged with precise location data that records where the shot was taken and at what angle. Relying on GPS isn't good enough. And deep inside the Grand Canyon's walls GPS probably won't work.

FALOR: So we have accelerometers, gyros, a barometer, a magnetometer as well as GPS. And then all that sensor data is combined to accurately place the images and place the orientation of the images.

HENN: The end result will be a smooth, continuous eye-level view of the trail. It should allow anyone who's online, at home or with a smartphone, to virtually peer down the Bright Angel Trail and see the sun stream over the rim of the canyon walls. The final product won't be posted for a few months, but if everything goes well, Ryan Falor promises it should be accurate.

FALOR: And if people want to use this to help understand where they need to go, it has to be accurate, even more so, back here. You may not want to walk off a trail I suppose, right.

HENN: Still, some worry as Google maps the backcountry this way, more and more people will think they can just wander into the wilderness with a cell phone and nothing else.

MAUREEN OLTROGGE: It's really important, though, if you're going to be taking any kind of a hike, to check in with our backcountry office to do the research and just come prepared.

HENN: Maureen Oltrogge runs public affairs at Grand Canyon National Park. She says the weather up here can be extreme.

OLTROGGE: And it can be in excess of 110, 120 degrees in the inner canyon.

HENN: And in the winter, it's frigid. But Google only makes these maps when the sun is shining. Rain on the lenses simply doesn't work. These maps won't include any information about temperature or weather, and won't tell you if trail conditions have changed. But the photos will be panoramic. And today, as the teams got ready to drop in over the rim and start their hike, the images promise to be gorgeous.

The sun's coming up.

VINCENT: Oh, good. OK. The sun's coming up. Excellent. We're almost ready to go then.

(LAUGHTER)

HENN: This is just the beginning. Google wants to send the trekker on expeditions all over the world. Team members talk about everything from the Appalachian Trial to Antarctica, and one day, maybe even Everest.

Steve Henn NPR News

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