This work was completed in 2023 and funded by the California Department of Transportation. Individual vernal pools were mapped within the Carol Witham complex polygons where high resolution lidar data was available, approximately 83% of the complex polygon area. SFEI attempted to map the remaining complex polygons without lidar data, however without lidar and high resolution time series data the results were not compelling enough to include in this final dataset. Data used to map pools included 3DEP high resolution lidar sourced from the years 2007 - 2022, NAIP 2018, and NAIP 2020. These data served as inputs to an object-based random forest model, trained by over 1,500 points across the central valley of California and refined post-classification using various thresholding functions. Segmentation, model training and application, and ruleset-based refinements were done in eCognition. The SFEI model used to classify the individual pools could later be applied to the unmapped Carol Witham complex polygons as new high resolution lidar in these areas becomes available or new vernal pool complexes are mapped

Creation Date: 
Tuesday, December 5, 2023
Last Updated: 
Tuesday, December 5, 2023
Type of Data: 
GIS vector dataset
Programs and Focus Areas: 
Environmental Informatics Program
Geographic Information Systems
Location Information
General Project Location(s): 
California Central Valley, where there was LiDAR coverage in 2023
Data Availability
Please Cite This Dataset as: 

San Francisco Estuary Institute (SFEI). 2023. "SFEI Individual Vernal Pools, 2023". Accessed [date retrieved].

Terms of Use: 

This data is free data: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This data is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

More information about GNU General Public License is available at SFEI data are available without restriction upon use with the following caveats. Prudent usage, knowledge of the data quality, and professional courtesy should all be considered in obtaining and using SFEI data. As this dataset is NOT a survey document, neither use it as such nor use it beyond the limits of the source scale. Please read and fully comprehend all available metadata prior to data use. SFEI requests that the use of these data in any map, publication, or report should include citation of the data source(s) used and give proper attribution and credit to the originators of the data. Questions about SFEI data may be directed to the SFEI GIS team at [email protected]

Data File(s): 
Package icon SFEI_IndividualVernalPools_2023.zip146.74 MB