In their latest 3D mapping feat, Google is taking on the world's hiking trails.Wanderlust reports that the new initiative was launched last week and involves strapping a cumbersome-looking backpack with a 15-lens camera to the back of a hiker.Google said: "We're taking another step forward with our Street View Trekker. You've seen our cars, trikes, snowmobiles and trolleys - but wheels only get you so far. There's a whole wilderness out there that is only accessible by foot. Trekker solves that problem by enabling us to photograph beautiful places such as the Grand Canyon so anyone can explore them. All the equipment fits in this one backpack, and we've already taken it out on the slopes."The Trekker is controlled by an Android smartphone plugged into the backpack but is essentially a smaller version of the kit carried by Street View cars.The company intends to map castles, ruins, hiking trails and the Grand Canyon in an effort to make a map of the world better than we have ever seen.