HEADWATERS ECONOMICS GEOGRAPHIC DATA LIBRARY DOCUMENTATION TITLE: Geodataset Name: us_griz-model Geodataset Type: GRID Geodataset Feature: NA GENERAL DESCRIPTION: The dataset shows estimates of grizzly bear population growth (lambda) based on roads, population density, urban centers, and greeness (a metric derived from satellite imagery that may be related to the distribution of prey). DATA SOURCE(S): Carlos Carroll Scale of Original Source Maps: 1:20,000 - 1:100,000 Date of Original Source Maps: 2000 - 2004 GEODATASET EXTENT: United States FEATURE ATTRIBUTE TABLES CODES AND VALUES: VALUE ITEM DESCRIPTION The Grid value represents estimated population growth (lambda). Lambda < 1 (Population is decreasing) Lambda = 1 (Stable Population) Lambda > 1 (Population is growing) Lambda = 2 (Population doubles its size each generation) DATA LINEAGE SUMMARY: The data were provided by Carlos Carroll, who used a PATCH model that combines regional scale maps of habitat quality with information from the field on how well animals survive, reproduce, and travel through different habitats, and then simulates the viability of populations on the landscape. 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/ 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