Before diving into the methods, it's essential to understand the difference between altitude and elevation. Altitude refers to the height of an object or place above a given planetary reference plane, ...

For more than a decade, survey flights have crisscrossed the United States using gravity instruments to calculate a new sea level in an effort that will save the country billions of dollars on ...

Kate Dignan has summited one 14er — she thinks it was probably Longs Peak, but she’s done her best to forget the experience. That trip, and countless photos from hikers around the state, got her ...