Data Series 781
Figure 1. Index map of California, showing locations of 110 CSMP map blocks (red squares), 83 of which are along the mainland coast and 27 are for offshore islands, each to be published at 1:24,000 scale. Published map blocks are shown with gray fill.
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.
This CSMP data catalog contains much of the data used to prepare the OFRs and the SIMs in the California State Waters Map Series. Other data that were used to prepare the maps were compiled from previously published sources (for example, onshore geology) and, thus, are not included herein.
Datasets within the data catalog have been compiled by various individuals (names are provided in the metadata for each dataset).
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]:
The GIS data layers for a particular CSMP map block or region are accessible from that area's individual data catalog, listed in the table below by geographic area, from north to south. Where available, links to that area's published OFR or SIM, which contains additional interpretive material, are provided in the table as well. In addition, video observations for the entire state have been compiled and are accessible from "California State Waters Map Series Data Catalog--Video Observations" (listed last in the table below).
Each individual data catalog lists the available GIS data layers with a brief description, a small image, and links to the metadata files and the downloadable data files. Information on file format and file size is given as well. The data were compiled in ArcMap (versions 10.0 and 10.1, ESRI, 2011, 2012). Raster data layers are registered TIFF images and are in either the UTM Zone 10 or UTM Zone 11 coordinate systems, with datum WGS84. Point, line, and polygon features are in shapefile format and are projected in either the UTM Zone 10 or UTM Zone 11 coordinates, with horizontal datum WGS84.
The downloadable data files have been compressed with the "zip" command, and they can be unzipped with Winzip (or other tool) on Windows systems. The .zip file for a TIFF image includes the image (.tif), the world registration file (.tfw), and the text (.txt) and XML (.tif.xml) versions of the metadata. The .zip for a shapefile includes the .aux, .dbf, .shp, .shx, .sbx, and .sbn files, as well as the text (.txt) and XML (.shp.xml) versions of the metadata. We recommend that you create a single new folder within which to unzip the files you want to use.
Other individual data catalogs and their GIS data layers will continue to be added to this Data Series as map block data catalogs, OFRs and SIMs, are published.
First posted August 8, 2013
Data Catalogs [listed in alphabetical order]:
For additional information:
Part of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.
California Seafloor Mapping Program Video and Photograph Portal
Golden, N.E., compiler, 2013, California State Waters Map Series Data Catalog: U.S. Geological Survey Data Series 781, http://pubs.usgs.gov/ds/781/.