HEADWATERS ECONOMICS GEOGRAPHIC DATA LIBRARY DOCUMENTATION TITLE: Geodataset Name: na_cmp_ecoreg Geodataset Type: GRID Geodataset Feature: NA GENERAL DESCRIPTION: This dataset describes areas of overlap in two layers that represent ecoregional assessments (1) Globally outstanding terrestrial ecoregions, and (2) Globally and continentally outstanding aquatic ecoregions DATA SOURCE(S): World Wildlife Fund Scale of Original Source Maps: 1:1,000,000 Date of Original Source Maps: 1999 GEODATASET EXTENT: Western North America FEATURE ATTRIBUTE TABLES CODES AND VALUES: NA DATA LINEAGE SUMMARY: The input datasets represent the outcomes of a terrestrial and an aquatic conservation assessment performed by the World Wildlife Fund. These assessments are described in the following publications: Terrestrial Ecoregions of North America: A Conservation Assessment by Taylor H. Ricketts, Eric Dinerstein, David M. Olson, Colby J. Loucks et al., Island Press Freshwater Ecoregions of North America: A Conservation Assessment by Robin A. Abell, Colby J. Loucks, Island Press In order to create the final dataset showing the areas of overlap in these two ecoregional assessment layers, twobinary grids were created and added together (the thresholds below were chosen to select approx. 25% of the Brainerd funding region): (1) Globally outstanding terrestrial ecoregions, and (2) Globally and continentally outstanding aquatic ecoregions 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: World Wildlife Fund - US Address: 1250 24th Street, NW Washington, DC 20037-1193 Web site: www.worldwildlife.org/science Phone: 202.822.3452 Email: nasser.olwero@wwfus.org 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