Web Mapping Illustrated: Using Open Source GIS Toolkits

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