HEADWATERS ECONOMICS GEOGRAPHIC DATA LIBRARY DOCUMENTATION TITLE: Geodataset Name: us_var-elev Geodataset Type: GRID Geodataset Feature: NA GENERAL DESCRIPTION: This dataset contains values representing variation of elevation in the surrounding five kilometer neighborhood for all locations in the US. When the standard deviation is small there is relatively little variation in the terrain. In other words, the terrain is relatively flat. Conversly, when the standard deviation is large, there is a high degree of variation in elevation. The terrain is relatively steep. DATA SOURCE(S): U.S. Geological Survey (USGS), EROS Data Center Scale of Original Source Maps: 1000 meter cells Date of Original Source Maps: 1999 GEODATASET EXTENT: United States FEATURE ATTRIBUTE TABLES CODES AND VALUES: ITEM ITEM DESCRIPTION NA DATA LINEAGE SUMMARY: The "focalstd" Arc/Info command was used to calculate the variation in elevation. MAP PROJECTION PARAMETERS PROJECTION ALBERS CONICAL EQUAL AREA DATUM NAD83 UNITS METERS SPHEROID GRS1980 PARAMETERS 1st standard parallel 29 30 0.000 2nd standard parallel 45 30 0.000 central meridian -96 00 0.000 latitude of projection's origin 37 30 0.000 false easting (meters) 0.00000 false northing (meters) 0.00000 DATA SOURCES CONTACT(S): Name: US Geological Survey Address: 521 National Center Reston, VA 20192 Phone: 703-648-4528 Email: bwright@usgs.gov Contact Person: Bruce Wright Website: http://mcmcweb.er.usgs.gov/sdts/geocomm.html http://data.geocomm.com/dem/ HEADWATERS ECONOMICS CONTACT: Name: Headwaters Economics Geographic Data Library Abbr. Name: HEGDL Address: Headwaters Economics 566 Highland St. Helena, Montana 59601 Web site: http://www.headwaterseconomics.org Contact Person: Patty Gude Phone: (406)599-7425 Email: patty@headwaterseconomics.org