At the head of the valley in Yosemite National Park - as if on a pedestal - stands Half Dome, the most colossal and recognizable rock monument in the Sierra Nevada, smoothly rounded on three sides and a sheer vertical face on the fourth.
We generally emphasize the following four points:
Why don't the elevations on your maps agree with those provided by my GPS system? Which ones are correct?
The USGS publishes approximately 57,000 different topographic maps covering the United States.