SDE Feature Class
Hogwallows, San Joaquin Valley, biota, environment, Great Valley, 2005, Sacramento Valley, California, Vernal Pools
Map showing the distribution of vernal pools in the Great Valley (California) as of publication of the Recovery Plan for Vernal Pool Ecosystems of California and Southern Oregon (U.S. Fish and Wildlife Service, 2005).
We mapped vernal pool distribution within a 21.4 million acre area surrounding the Great Valley from 2005 National Agricultural Imaging Program (NAIP) county photomosaics using ESRI ArcMap 9.x in a double-blind protocol. Each mapped polygon was scored for classes of habitat cover, habitat density, habitat diversity, disturbance cover, and disturbance intensity. Ground truth sampled 25% of the polygons we drew; the double blind protocol lowered our error rate to about 2 percent. We mapped 807,820 acres of vernal pool landscape in 1,909 polygons and present various tabular summaries of polygon number and acreage by recorded attribute. We overlaid our results with a map of Core Recovery Areas (CRAs), finding 452,012 acres within the CRAs, and an additional 120,137 acres immediately contiguous to the CRAs.
Carol W. Witham, Robert F. Holland and John Vollmar. 2013. 2005 Great Valley Vernal Pool Map, Plus Merced, Placer and Sacramento County Losses 2005-2010. Sacramento, CA. Report prepared for the U.S. Fish and Wildlife Service's and Bureau of Reclamation's CVPIA Habitat Restoration Program under Grant Agreement No. 80270-A-G509 with the USFWS.
|Maximum (zoomed in)||1:5,000|
|Minimum (zoomed out)||1:150,000,000|