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Napa County Resource Conservation District |
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Napa County Resource Conservation District |
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Geographic Information System (GIS) is a set of tools which allow for storage, management, modification, analysis and visualization of spatial and tabular data. The use of a GIS can display information about user-defined areas, and can perform spatial analysis using geographic databases. GIS technology integrates common database operations such as query and statistical analysis with the unique visualization and geographic analysis benefits offered by maps.
Click on the map you would like to view:
(requires Adobe Accrobat Reader-download time depends on your browser)
(click here to go to Adobe.com to install Adobe Acrobat Reader for free)
Subwatersheds of the Napa River map
Major Drainage Basins of Napa County map
Napa County Digital Elevation Model map
The Napa County RCD uses GIS to support all ongoing projects and has been successful in producing maps for meetings, presentations and reports. The RCD can create maps which convey overall information about the Napa River watershed, as well as site-specific information. Maps of interest include water quality monitoring sites, steelhead distribution locations, salmonid habitat, landowner stewardship watershed maps, and dominant soil types. The Napa County RCD uses ArcGIS, a product of ESRI, as the primary analysis and display tool. A current project in which GIS is used extensively is in the Dry Creek Planning grant. It is the intention of this grant to summarize existing conditions in the watershed in order to identify areas of interest for further investigation when looking at salmonid habitat in the watershed. The Planning grant for Dry Creek will look at soil, geology, vegetation, creek and road locations in an effort to identify areas of focus for effects on salmonid habitat. The RCD´s analysis will be conducted to answer questions such as: Where are sensitive areas in the watershed? Where are salmonids distributed? What land use changes have gone on over time? What effects have land use changes had on the habitat?
GIS mapping also played an important role in the CALFED watershed analyses completed for the Carneros and Sulphur Creek watersheds. Salmonid habitat maps were generated from field data using a process called "dynamic segmentation" in ArcMap. The maps allow landowners to quickly identify key habitat features along the stream such as spawning habitat (click here to view map (pdf file)) , riparian canopy (click here to view map (pdf file)), and juvenile rearing habitat.
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