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:
“The source of all life and knowledge is in man and woman, and the source of all living is in the interchange and the meeting and mingling of these two: man-life and woman-life, man-knowledge and woman-knowledge, man-being and woman-being.”
—D.H. (David Herbert)
“By poeticizing love, we imagine in those we love virtues that they often do not possess; this then becomes the source of constant mistakes and constant distress.”
—Anton Pavlovich Chekhov (18601904)
“Diligence is the basis of wealth, and thrift the source of riches.”
—Chinese proverb.