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
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“Dear sensibility! source inexhausted of all that’s precious in our joys, or costly in our sorrows!... eternal fountain of our feelings!—’tis here I trace thee—and this is thy divinity which stirs within me ...—all comes from thee, great—great SENSORIUM of the world!”
—Laurence Sterne (1713–1768)
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—Edward Hoagland (b. 1932)
“Man is a stream whose source is hidden. Our being is descending into us from we know not whence. The most exact calculator has no prescience that somewhat incalculable may not balk the very next moment. I am constrained every moment to acknowledge a higher origin for events than the will I call mine.”
—Ralph Waldo Emerson (1803–1882)