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Index[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Z] U.S. Geologic Survey U.S. Geologic Survey (USGS) projection document U.S. Maps and Data U.S. National Atlas U.S. National Geophysical Data Center (NGDC) various types of data U.S. National Geospatial Data Clearinghouse uniq command (Unix) -c option -d option United Nations UNITS keyword Universal Transverse Mercator (UTM) 2nd Unix commands awk colrm column cut expand/unexpand grep using to show only names of airports head/tail join look nl paste sed finding specific patterns reformatting print results removing lines and removing front end of lines sort creating list of ordered elevations text-processing tsort uniq -c option uniq-d option wc User-friendly Desktop GIS (UDIG) USGS DEM Digital elevation models for the United States UTM (Universal Transverse Mercator) projection 2nd zone map showing, roughly, the location of the zones |
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