POD! GIS Shapefile of Hydrodynamic Subregions of the Upper San Francisco Estuary

This is an ESRI (ArcGIS) shapefile of the hydrodynamic subregions of the Upper San Francisco Estuary, California, as sketched conceptually by the Delta Regional Ecosystem Restoration Implementation Plan team (J. Burau, USGS, unpublished data). It was digitized from a drawing to allow for general level assessments of land use and other environmental effects within ecologically meaningful spatial units.