If you could pull back the vegetation and man-made structures and have a high definition view from above, what would you learn about the landscapes and valleys below? A lot, it turns out. A ...

To create models that accurately depicted the altitudes and drops of Nevada’s rugged landscape, the team had to work with a geographer to pull topographic maps from the U.S. Geological Survey ...

The Vernal and Nevada Falls , ... National Geographic has published a new booklet featuring detailed topographic maps of 18 of Yosemite's top day hikes, which range in difficulty and distance.