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:
“A comfortable house is a great source of happiness. It ranks immediately after health and a good conscience.”
—Sydney Smith (1771–1845)
“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)
“The act of birth is the first experience of anxiety, and thus the source and prototype of the affect of anxiety.”
—Sigmund Freud (1856–1939)