In 2007, the California Ocean Protection Council initiated the California Seafloor Mapping Program (CSMP), designed to create a comprehensive seafloor map of high-resolution bathymetry, marine benthic habitats, and geology within the 3-nautical-mile limit of California's State Waters. The CSMP approach is to create highly detailed seafloor maps and associated data layers through the collection, integration, interpretation, and visualization of swath sonar data, acoustic backscatter, seafloor video, seafloor photography, high-resolution seismic-reflection profiles, and bottom-sediment sampling data.
CSMP has divided coastal California into 110 map blocks (fig. 1), each to be published individually as USGS Open-File Reports (OFRs) or Scientific Investigations Maps (SIMs) at a scale of 1:24,000. The map products display seafloor morphology and character, identify potential marine benthic habitats, and illustrate both the seafloor geology and shallow (to about 100 m) subsurface geology.
For each map block, CSMP has created geographic information system (GIS) data layers for bathymetry, bathymetric contours, acoustic backscatter, seafloor character, potential benthic habitat, and offshore geology. In addition, CSMP has compiled regional-scale data layers for sediment thickness, depth to transition, transgressive contours, isopachs, and predicted distributions of benthic macro-invertebrates, as well as visual observations of benthic habitat from video cruises over the entire state.
The GIS data layers are listed below. Note, however, that not all data layers are available for all map blocks, owing to insufficient data. Also, some map blocks may include additional data layers that record certain unique characteristics or features not present in other areas.
GIS Data Layers:
Additional GIS Data Layers [available for selected map blocks only]: