Vernal Pools - Shasta, Tehama [ds110]

This dataset is to be used for Vernal Pool assessment and planning purposes.

The Vernal Pools layer is a planning level tool depicting Vernal Pool Resources in Shasta and Tehama Counties. This layer is a combination of two original Vernal Pool layers. Both original layers were developed by CSU Chico's Geographic Information Center (GIC) and are fairly comparable for landscape level resource identification. The description of each is as follows: The "redding_vernal" coverage identifies the location and areal extent of vernal pool resources east of Redding California. This coverage was created as part of a project to prioritize vernal pool wetlands for preservation through a wetland mitigation bank program. Color Infrared Aerial Photographs were obtained in April 1992, at a nominal Scale of 1":1000' (1:12000). Information from these photos were transferred to black and white rectified photos, which were again photographed in July 1992 and rectified to a scale of 1":400' (1:4800). Manual interpretation followed to identify classification types. Ground truthing checks were conducted throughout the project to confirm mapping accuracy. The "Tehama_vernal" coverage was produced for the California Department of Fish and Game by the California State University, Chico, Geographical Information Center. The project area includes the entire northern Sacramento Valley portion of Tehama County and areas within the lower Battle, Inks, and Paynes Creek watersheds. Vernal pools were classified using color infrared aerial photography flown on April 28, 1993 at a scale of RF=1:12000. Polygons were developed on 1:4800 enlarged black-and-white transparencies, scanned, ortho-rectified, and digitized into ArcView. These two layers were merged together by Eric Haney (CDFG) and the features were attributed to indicate the respective project. The data depicted in this layer were developed using older technologies (e.g., mylar overlays, etc.) and as such are not spatially accurate in all locations. While no specific spatial accuracy assessment has been performed, comparisons with DOQQs and other imagery sources indicate some mis-registration. As such care should be taken in applying these data. In its current form, this layer should only be used as an indicator of vernal pool resources in a given area and as an estimate of the relative areal extent and composition of vernal pool resources for a given area. Use for project level planning is not advised with out first assessing the spatial accuracy of the layer for the project area.

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The data depicted in this layer were developed using older technologies (e.g., mylar overlays, etc.) and as such are not spatially accurate in all locations. While no specific spatial accuracy assessment has been performed, comparisons with DOQQs and other imagery sources indicate some mis-registration. As such care should be taken in applying these data. In its current form, this layer should only be used as an indicator of vernal pool resources in a given area and as an estimate of the relative areal extent and composition of vernal pool resources for a given area. Use for project level planning is not advised with out first assessing the spatial accuracy of the layer for the project area.