20260313 11022900 1.0 TRUE 150000000 5000 ISO19115_3 Mean Annual Evapotranspiration (inches) <div style='text-align:Left;'><div><div><p><span>Mean Annual Evapotranspiration (inches) spatial data raster.</span></p><p><span>ESA requested spatial evapotranspiration (ET) data from DWR and CIMIS. DWR provided reference evapotranspiration raster layers for every year from 2004-2024. Each raster has 365-366 bands to represent reference evapotranspiration for each day within that year. ESA summed these raster bands by year using a Python script. ESA then averaged the annual ET rasters using the ArcGIS Pro Raster Calculator tool to produce the mean annual evapotranspiration spatial data raster. The Coordinate Reference System of the DWR rasters and mean annual ET raster is NAD 1983 California (Teale) Albers (Meters) and the native cell size is 2000m. ESA reprojected the raster from NAD 1983 California (Teale) Albers (Meters) to NAD 1983 StatePlane California II FIPS 0402 (US Feet) using the Project Raster tool with bilinear interpolation resampling. The Project Raster tool was set to the default cell size conversion from meters to feet. ESA used the Raster Calculator tool in ArcGIS Pro to convert the reprojected mean annual ET raster from millimeters to inches. Finally, ESA clipped the California-wide raster to a boundary of Napa County with a 1-mile buffer using the Extract by Mask tool.</span></p><p><span>https://data.ca.gov/dataset/cimis-weather-station-spatial-cimis-data-web-api</span></p></div></div></div> California Department of Water Resources (DWR), 2025, ESA, 2026 Mean_Annual_ET_master Napa County BDR evapotranspiration hydrology <div style='text-align:Left;'><div><div><p><span>Disclaimer: This GIS data is intended to provide a visual display of data for the user's convenience. Users of this data are hereby notified that the appropriate public primary information sources should be consulted for verification of the information. Although every reasonable effort has been made to assure the accuracy of this data, Napa County makes no warranty, representation or guaranty as to the content, sequence, accuracy, timeliness or completeness of any of the data provided herein and explicitly disclaims any representations and warranties, including, without limitation, the implied warranties of merchantability and fitness for a particular purpose. Napa County assumes no liability for any errors, omissions, or inaccuracies in the information provided regardless of how caused and assumes no liability for any decisions made or actions taken or not taken by the user of the data in reliance upon any information or data furnished hereunder. Because the GIS data provided is not warranted to be up-to-date, the user should check with the County staff for updated information.</span></p></div></div></div> Esri ArcGIS 13.5.2.57366 Napa County 1 -122.676970 -122.054052 38.139594 38.880250 -122.6466 -122.0614 38.8643 38.1537 1 20260313 DWR CIMIS Public Contact California Department of Water Resources DWRCIMISPublicContact@water.ca.gov