Knowledge of species' spatial distributions is crucial to the identification and prioritization of watersheds in need of restoration. Coupled with species' status, the presence and or absence of species can indicate biologically diverse vs. depauperate areas.

PISCES is software and data describing the best-known ranges for California's native fish. The data is compiled from multiple sources and experts and is stored and exported as rangemaps and summary maps. As of December 2013, it includes data on all of the state's 131 native fish taxa as well as 48 non-native species.

As part of numerous other projects, Center for Watershed Sciences staff and researchers have developed code to run analyses, organize and store data, interface with other systems, automate processing, and more. Some of this code is designed to be reusable as standalone products, or as code in other, larger projects. You can find this code below.

We developed novel methods to interpolate between sparse historical soundings, infer depths of non-navigable channels from channel width, and convert historical tidal datums to modern fixed datums. The resulting 2-meter resolution digital elevation model covers Delta historical channels, tidal wetlands, adjacent non-tidal freshwater wetlands and upland transitional areas below 25 feet in elevation.