Source
The NED dataset is a compilation of data from a variety of existing high-precision datasets such as LiDAR data (see also National LIDAR Dataset - USA), contour maps, USGS DEM collection, SRTM and other sources which were reorganized and combined into a seamless dataset, designed to cover all the United States territory in its continuity.
Read more about this topic: National Elevation Dataset
Famous quotes containing the word source:
“There often seems to be a playfulness to wise people, as if either their equanimity has as its source this playfulness or the playfulness flows from the equanimity; and they can persuade other people who are in a state of agitation to calm down and manage a smile.”
—Edward Hoagland (b. 1932)
“Diligence is the basis of wealth, and thrift the source of riches.”
—Chinese proverb.
“The particular source of frustration of women observing their own self-study and measuring their worth as women by the distance they kept from men necessitated that a distance be kept, and so what vindicated them also poured fuel on the furnace of their rage. One delight presumed another dissatisfaction, but their hatefulness confessed to their own lack of power to please. They hated men because they needed husbands, and they loathed the men they chased away for going.”
—Alexander Theroux (b. 1940)