HEADWATERS ECONOMICS GEOGRAPHIC DATA LIBRARY DOCUMENTATION TITLE: Geodataset Name: amer_ftprnt Geodataset Type: GRID Geodataset Feature: NA GENERAL DESCRIPTION: This dataset shows Carlos Carroll's habitat effectiveness layer with the exception of eastern Montana where the values come from the Wildlife Conservation Societies (WCS) human footprint layer. Carroll's layer combines road density on private and public lands and local human population density. The WCS layer describes degrees of human impact according to the Last of the Wild Project. The dataset was created from nine global data layers covering human population pressure (population density population settlements), human land use and infrastructure (built up areas, nighttime lights, land use/land cover), and human access (coastlines, roads, railroads, navigable rivers). DATA SOURCE(S): Carlos Carroll Wildlife Conservation Society (WCS) Center for International Earth Science Information Network (CIESIN) Scale of Original Source Maps (Carroll): 1:20,000 - 1:100,000 Date of Original Source Maps (Carroll): 2000 Scale of Original Source Maps (WCS): 1 km cells Date of Original Source Maps (WCS): 1995 GEODATASET EXTENT: North America FEATURE ATTRIBUTE TABLES CODES AND VALUES: VALUE ITEM DESCRIPTION 0 = Most Impacted 10 = Least Impacted DATA LINEAGE SUMMARY: The data were provided by Carlos Carroll, who used layers from the following sources: Center for International Earth Science Information Network (CIESIN) Alberta Environmental Protection Statistics Canada Terrain Resource Information Management (TRIM) US Geological Survey US Census Bureau GIS data on roads, trails, and railroads were assembled for the study area and grouped into classes based on the degree of expected use. Road density calculations incorporated weights based on the classes, with highways weighted two to three times the weight of unpaved roads. Trails and other routes were rated at 0.35 that of unpaved roads. Human population data were acquired at the scale of census blocks (United States) and enumeration areas (Canada). An inverse distance weighting algorithm was performed on a point data layer of population centers. Carroll's layer has no data for eastern Montana, so the WCS layer was reclassified from 0-100 to 0-10 and used to fill in the gap. The WCS dataset describes degrees of human impact according to the Last of the Wild Project. The dataset was created from nine global data layers covering human population pressure (population density population settlements), human land use and infrastructure (built up areas, nighttime lights, land use/land cover), and human access (coastlines, roads, railroads, navigable rivers). 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: Carlos Carroll Address: Klamath Center for Conservation Research Orleans, CA 95556 Phone: 530-627-3512 Email: carlos@klamathconservation.org Web site: http://www.klamathconservation.org/ Name: Center for International Earth Science Information Network (CIESIN) User Services Address: CIESIN, Columbia University, P.O. Box 1000, 61 Route 9W PO Box 173460 Palisades, NY 10964 Web site: http://www.ciesin.columbia.edu/wild_areas/ Phone: 845-365-8920 Fax: 845-365-8922 Email: ciesin.info@ciesin.columbia.edu 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