The National Elevation Dataset (NED) consists of high precision ground surface elevation data for the United States. It is maintained by the USGS and all the data are in public domain
Read more about National Elevation Dataset: Source, Formats, Precision
Famous quotes containing the words national and/or elevation:
“It is accordance with our determination to refrain from aggression and build up a sentiment and practice among nations more favorable to peace ... that we have incurred the consent of fourteen important nations to the negotiation of a treaty condemning recourse to war, renouncing it as an instrument of national policy.”
—Calvin Coolidge (1872–1933)
“In private life he was good-natured, chearful, social; inelegant in his manners, loose in his morals. He had a coarse, strong wit, which he was too free of for a man in his station, as it is always inconsistent with dignity. He was very able as a minister, but without a certain elevation of mind necessary for great good, or great mischief.”
—Philip Dormer Stanhope, 4th Earl Chesterfield (1694–1773)