Vernal Pools Study Area: Central Valley, California, 1998 - Holland, Ph.D., Robert F.; U.S. Fish and Wildlife Service; California. Department of Fish and Wildlife (California Department of Fish and Wildlife GIS Maps & Data, 1998)
This polygon shapefile is believed to represent a boundary used for mapping vernal pool complexes in a study by Dr. Robert F. Holland (reference the mapped vernal pool complexes dataset named "usfwsvp2" for related information).True color aerial slides from the Deptartment of Water Resources were interpreted, and vernal pool complexes were identified. Complexes more than 40 acres in size were then digitized as polygons and given a density rating (see Resource Fields for attribute definitions). This layer was created to help biologists and resource planners make informed decisions in their recovery and planning efforts. It depicts vernal pool complexes, not individual vernal pools. Since the minimum mapping unit of the coverage is 40 acres, it may not provide the level of detail required for larger scale (smaller area, more site-specific) conservation planning.
This coverage is a polygon layer of vernal pool complexes greater than 40 acres in size for 29 counties throughout the greater Central Valley, and some north bay counties. In 1995, Dr. Robert F. Holland identified the complexes on aerial photos (the most recent available for each county) and traced the polygons onto USGS 7.5' quads from which they were digitized. Vernal pool complexes were then given a density rating. The coverage was refined in June of 1998, with SPOT Imagery and recent U2 (low-flying aircraft) photography. The layer does not contain delineations of individual vernal pools and was not intended for use in wetland delineations. This coverage allows for display and analysis of existing vernal pool complexes in California's Central Valley.
California Department of Fish and Wildlife. (1998). Vernal Pools Study Area: Central Valley, California, 1998. California Department of Fish and Wildlife. Available at: http://purl.stanford.edu/vp108sq2622.
This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
Rights: This item is in the public domain. There are no restrictions on use.
Rights: This work is in the Public Domain, meaning that it is not subject to copyright.
Keywords: Geospatial data; cartographic dataset; Vernal pools; Wetlands; Vernal pool ecology; Central Valley (Calif.); 1998; Environment; Biology and Ecology