91bc7590-b8de-4fb5-a5bf-e88ba4cd28c7 Erin Antognoli USDA/ARS/NAL > National Agricultural Library, Agricultural Research Service, U. S. Department of Agriculture Metadata Librarian erin.antognoli@ars.usda.gov 2016-06-08T13:02:22 ISO 19115:2003/19139 1.0 WGS 1984 USGS - eco_4_Ecosystems - Terrestrial Ecosystems 2008-10-15T00:00:00 http://localhost:8080/demodem/editioin The U.S. Geological Survey (USGS) modeled the distribution of terrestrial ecosystems for the contiguous United States using a standardized, deductive approach to associate unique physical environments with ecological systems characterized in NatureServe's Ecological Systems of the United States classification (Comer et al., 2003). This approach was first developed for South America (Sayre et al., 2008) and is now being implemented globally (Sayre et al., 2007). Unique physical environments were delineated from a massive biophysical stratification of the nation into the major structural components of ecosystems: biogeographic regions (Cress et al., 2008c), land surface forms (Cress et al., 2008a), surficial lithology (Cress et al., 2008d), and topographic moisture potential (Cress et al., 2008b). Each of these structural components was mapped for the contiguous United States and then spatially combined to produce ecosystem structural footprints which represented unique abiotic (physical) environments. Among 49,168 unique structural footprint classes, 13,482 classes which met a minimum pixel count threshold (20,000 pixels) were aggregated into 432 NatureServe ecosystems through semi-automated labeling process using rule set formulations for attribution of each ecosystem. Jill Cress USGS Rocky Mountain Geographic Science Center Computer Scientist 303-202-4275 jjcress@usgs.gov https://rmgsc.cr.usgs.gov/arcgis/services/contUS/MapServer/WMSServer?service=WMS&version=1.3.0&request=GetMap&layers=4&crs=4326&bbox=-128.011185,22.693916,-65.224148,51.675398&width=768&height=400&styles=default&format=image/png Thumbnail in PNG format from USGS WMS server GetMap request thumbnail large_thumbnail Terrestrial Ecosystem Geospatial mapping Biogeography World boundaries -128.006694 -65.230305 22.69674 51.670907 OGC:OWS-C 1 http://rmgsc.cr.usgs.gov/arcgis/rest/services/ecosys_US/MapServer WWW:LINK-1.0-http--link ecosys_US (MapServer) Parent data web page http://rmgsc.cr.usgs.gov/outgoing/ecosystems/USdata/ WWW:LINK-1.0-http--link USGS Geosciences and Environmental Change Science Center (GECSC) Outgoing Datasets Data download page used to create the shapefiles http://rmgsc.cr.usgs.gov/ecosystems/ WWW:LINK-1.0-http--link USGS Global Ecosystems page Information about the ecosys data layers http://rmgsc.cr.usgs.gov/ecosystems/docs/us_ecosystems_30m_dd83.htm#1 WWW:LINK-1.0-http--link Terrestrial Ecosystems Metadata for this resource http://rmgsc.cr.usgs.gov/arcgis/rest/services/ecosys_US/MapServer/0 WWW:LINK-1.0-http--link Layer: Ecosystems (ID: 0) Metadata about the Ecosystems layer test