B. Dieter H.G. Greene C.A. Endris 2013 polygon shapefile digital data Data Series DS 781 Reston, VA U.S. Geological Survey https://pubs.usgs.gov/ds/781/OffshoreHalfMoonBay/data_catalog_OffshoreHalfMoonBay.html https://doi.org/10.3133/ds781 Nadine E. Golden 2013 database Data Series DS 781 Reston, VA U.S. Geological Survey https://doi.org/10.3133/ds781 This part of DS 781 presents data for the habitat map of the seafloor of the Offshore of Half Moon Bay map area, California. The polygon shapefile is included in "Habitat_OffshoreHalfMoonBay.zip," which is accessible from https://pubs.usgs.gov/ds/781/OffshoreHalfMoonBay/data_catalog_OffshoreHalfMoonBay.html. These data accompany the pamphlet and map sheets of Cochrane, G.R., Dartnell, P., Greene, H.G., Johnson, S.Y., Golden, N.E., Hartwell, S.R., Dieter, B.E., Manson, M.W., Sliter, R.W., Ross, S.L., Watt, J.T., Endris, C.A., Kvitek, R.G., Phillips, E.L., Erdey, M.D., Chin, J.L., and Bretz, C.K. (G.R. Cochrane and S.A. Cochran, eds.), 2014, California State Waters Map Series—Offshore of Half Moon Bay, California: U.S. Geological Survey Open-File Report 2014–1214, pamphlet 37 p., 10 sheets, scale 1:24,000, https://doi.org/10.3133/ofr20141214. Potential marine benthic habitat maps were constructed using multibeam echosounder (MBES) bathymetry and backscatter data. The habitats were based on substrate types and documented or "ground truthed" using underwater video images and seafloor samples obtained by the USGS. These maps display various habitat types that range from flat, soft, unconsolidated sediment-covered seafloor to hard, deformed (folded), or highly rugose and differentially eroded bedrock exposures. To expand habitat mapping to the seafloor within the California's State Waters and to contribute to a uniform regional database, which can be used with geographic information systems. Additionally, to provide a habitat map for the public and geoscience community to aid in assessments in the Offshore of Half Moon Bay coastal region and to provide information for land-use and land-management decisions both onshore and offshore. This information is not intended for navigational purposes. Additional information about the USGS field activity from which some of these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=F307NC Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology. References Cited: Greene, H.G., Bizzarro, J.J., O'Connell, V.M., and Brylinsky, C.K., 2007, Construction of digital potential marine benthic habitat maps using a coded classification scheme and its application, in Todd, B.J., and Greene, H.G., eds., Mapping the seafloor for habitat characterization: Geological Association of Canada Special Paper 47, p. 141-155. Greene, H.G., Yoklavich, M.M., Starr, R.M., O'Connell, V.M., Wakefield, W.W., Sullivan, D.E., McRea, J.E., Jr., and Cailliet, G.M., 1999, A classification scheme for deep seafloor habitats: Oceanologica Acta, v. 22, no. 6, p. 663-678. 2013 Publication Date Complete none planned -122.59 -122.42 37.55 37.39 USGS Metadata Identifier USGS:3a0c1375-84c7-44c1-a856-74fd13a724e8 ISO 19115 Topic Category geoscientificInformation environment oceans imageryBaseMapsEarthCover Data Categories for Marine Planning distributions physical habitats and geomorphology habitat Marine Realms Information Bank (MRIB) keywords seabed habitats benthos USGS Thesaurus sea-floor characteristics habitats benthos maps and atlases geospatial datasets None U.S. Geological Survey USGS Coastal and Marine Hazards and Resources Program CMHRP Pacific Coastal and Marine Science Center PCMSC Coastal and Marine Ecological Classification Standard (CMECS) Marine Nearshore Subtidal Marine Offshore Subtidal Transform Continental Margin Continental/Island Shelf Rock Substrate Unconsolidated Mineral Substrate Geographic Names Information System (GNIS) Pacific Ocean California San Mateo County Half Moon Bay Coastal and Marine Ecological Classification Standard (CMECS) Northern California Ecoregion Coastal and Marine Ecological Classification Standard (CMECS) Substrate none USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey and the Center for Habitat Studies at Moss Landing Marine Laboratories as the originator(s) of the dataset and in products derived from these data. This information is not intended for navigation purposes. U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060-5792 US 831-427-4747 pcmsc_data@usgs.gov https://pubs.usgs.gov/ds/781/OffshoreHalfMoonBay/images/Habitat_OffshoreHalfMoonBay.jpg Benthic habitats in the Offshore of Half Moon Bay, California, map area. JPEG Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; ESRI ArcGIS 10.0.3.3600 Guy R. Cochrane Peter Dartnell H. Gary Greene Samuel Y. Johnson Nadine E. Golden Stephen R. Hartwell Bryan E. Dieter Michael W. Manson Ray W. Sliter Stephanie L. Ross Janet T. Watt Charles A. Endris Rikk G. Kvitek Eleyne L. Phillips Mercedes D. Erdey John L. Chin Carrie K. Bretz 2014 pamphlet and map sheets Open-File Report 2014-1214 Reston, VA U.S. Geological Survey https://doi.org/10.3133/ofr20141214 Map elements were visually checked for overshoots, undershoots, duplicate features, and other errors by the lead authors and by the GIS technician(s) who created the digital database. Review drafts of the map were reviewed internally by at least two other geologists for consistency with basic geologic principles and general conformity to USGS mapping standards. Data are complete. Contact authors for information about omissions, selection criteria, generalization, definitions used, and other rules used to derive the data set. Interpretation and polygon delineation of habitats performed at scales from 1:2000 to 1:5000 Carrie K. Bretz Rikk G. Kvitek Peter Dartnell Eleyne L. Phillips 2013 raster digital data Data Series DS 781 Reston, VA U.S. Geological Survey See metadata for bathymetry ("Bathymetry_OffshoreHalfMoonBay_metadata.txt") in DS 781 for source data and postprocessing/reprocessing information. https://pubs.usgs.gov/ds/781/OffshoreHalfMoonBay/data_catalog_OffshoreHalfMoonBay.html digital file of gridded bathymetry data (ArcInfo GRID) 2006 2009 ground condition bathymetry Gridded bathymetry data (2-meter resolution). Carrie K. Bretz Rikk G. Kvitek Peter Dartnell Eleyne L. Phillips 2013 raster digital data Data Series DS 781 Reston, VA U.S. Geological Survey See metadata for backscatter data ("BackscatterA_8101_OffshoreHalfMoonBay_metadata.txt" and "BackscatterB_7125_OffshoreHalfMoonBay_metadata.txt") in DS 781 for amplitude source data and postprocessing/reprocessing information. https://pubs.usgs.gov/ds/781/OffshoreHalfMoonBay/data_catalog_OffshoreHalfMoonBay.html digital file of gridded amplitude data (ArcInfo GRID) 2006 2007 ground condition backscatter Gridded amplitude data (2-meter resolution). Jane A. Reid Jamey M. Reid Chris J. Jenkins Mark Zimmerman S. Jeffress Williams Michael E. Field 2006 Data Series DS 182 Menlo Park, CA U.S. Geological Survey https://pubs.usgs.gov/ds/2006/182/ Esri project files, csv files 2006 publication date sediment seafloor sediment and rock samples used to interpret seafloor geology Brian Edwards Eleyne Phillips Nadine Golden Lisa Krigsman Pete Dartnell 2012 Data Series DS 781 Reston, VA U.S. Geological Survey See metadata for F307NC video observations ("f307nc_video_observations_metadata.txt") in DS 781 for source data and postprocessing/reprocessing information. https://pubs.usgs.gov/ds/781/OffshoreHalfMoonBay/data_catalog_OffshoreHalfMoonBay.html vector digital data 20070927 20071011 ground condition F307NC seafloor interpretations from underwater video and sediment samples Nadine E. Golden Guy R. Cochran 2013 data release DOI:10.5066/F7J1015K Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey https://doi.org/10.5066/F7J1015K seafloor video and photographs 2013 publication date imagery seafloor video and photographs used to interpret seafloor geology Eleyne L. Phillips Mercedes D. Erdey Guy R. Cochrane 2013 GeoTiff Data Series DS 781 Reston, VA U.S. Geological Survey https://doi.org/10.3133/ds781 raster interpretation of seafloor character 2006 2007 ground condition sfc seafloor character used to interpret habitats H.G. Greene M.W. Manson B.E. Dieter S.L. Ross S.R. Hartwell S.Y. Johnson J.T. Watt 2013 vector digital data Data Series DS 781 Reston, VA U.S. Geological Survey https://doi.org/10.3133/ds781 polygon shapefile of geologic map interpretations 2006 2010 ground condition geology geologic units used to interpret habitats Data used for the creation of the potential marine benthic habitat interpretation consists of multibeam bathymetry, acoustic backscatter, sediment samples, camera-sled imagery, and existing geologic and seafloor interpretive maps. All data were compiled and displayed for interpretation using Esri ArcGIS software, ArcMap v.10.2. The process consists of editing a shapefile within ArcMap, beginning with the construction of polygons to delineate benthic features. A benthic feature is an area with common characteristics which can be characterized as a single potential habitat type. The boundaries and extents of these features were determined from the bathymetric data. In general, interpretations were made at scales between 1:2,000 and 1:5,000. The USGS kindly provided the Center for Habitat Studies with a geodatabase consisting of feature datasets delineating geologic features and attributes for offshore San Francisco. Some of the delineated polygons were preserved as part of the potential marine benthic habitat characterization. However, the Greene and others (2007) code was used in attributing the dataset and additional polygons were added using the methods outlined below. High-resolution multibeam sonar data in the form of bathymetric depth grids (seafloor digital elevation models, referred to as the "bathymetry") were the primary data used in the interpretation of potential habitat types. Shaded-relief imagery ("hillshade") allows for visualization of the terrain and interpretation of submarine landforms. On the basis of these hillshades, areas of rock were identified by their often sharply defined edges and high relative relief; these may be contiguous outcrops, isolated parts of outcrop protruding through sediment cover (pinnacles), or isolated boulders. Although these types of features can be confidently characterized as exposed rock, it is not uncommon to find areas within or around the rocky feature that appear to be covered by a thin veneer of sediment. These areas are identified as "mixed" induration, containing both rock and sediment. Broad areas of the seafloor lacking sharp and angular characteristics are considered to be sediment. Sedimentary features may contain erosional or depositional characteristics recognizable in the bathymetry, such as dynamic bedforms (dunes or sand waves). General morphologic features such as scours, mounds, and depressions were also identified using the hillshade imagery. The combination of acoustic backscatter data and "ground truthed" sediment samples were used to delineate seafloor sediment types within areas identified as "soft (s)" induration. Initially, ground truth data, in the form of grab sample descriptions and average grain size measurements, were categorized into four grain-size categories: mud (m), muddy sand (s/m), sand (s), and sandy gravel (s/g). Backscatter data was then classified into four intensity categories (low, med, high, very high) that are assumed to correspond to relative grain sizes. The aim was to develop an intensity classification of the seafloor that correlated with the data collected from the sediment samples. Thus, the combination of remotely observed data (acoustic backscatter) and directly observed data (sediment grab samples) translates to higher confidence in our ability to interpret broad areas of the seafloor. Nonetheless, we caution against using our sediment type interpretations as anything more than "best-guess" because of the following issues: characterization of contiguous sediment bodies is a difficult procedure because even small areas can exhibit a wide spectrum of backscatter-intensity values that lack distinct boundaries; backscatter intensity can be affected by depth, vegetation, water column conditions, and seafloor relief; and directly observed sediment data, in the form of sediment samples, represents a very small area relative to remotely observed data, requiring broad areas of interpolation. bathymetry backscatter sfc geology sediment F307NC 2012 Added Distribution_Information section to metadata to facilitate data download. 20171005 U.S. Geological Survey Alan O. Allwardt Contractor -- Information Specialist mailing and physical address

2885 Mission Street

Santa Cruz CA 95060 831-460-7551 831-427-4748 aallwardt@usgs.gov Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. 20171005 U.S. Geological Survey Alan O. Allwardt Contractor -- Information Specialist mailing and physical address

2885 Mission Street

Santa Cruz CA 95060 831-460-7551 831-427-4748 aallwardt@usgs.gov Added keywords from Coastal and Marine Ecological Classification Standard (CMECS) to metadata. 20180426 U.S. Geological Survey Alan O. Allwardt Contractor -- Information Specialist mailing and physical address

2885 Mission Street

Santa Cruz CA 95060 831-460-7551 831-427-4748 aallwardt@usgs.gov Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. 20201019 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Metadata was modified to bring up to current USGS PCMSC standards. USGS Thesaurus and keywords were added, information for accompanying Open-File Report added to Abstract and Cross Reference sections, Point of Contact and Metadata Contact information was updated, and Process Steps were refined. Information about the data available for download and different Network Resource Name links and details were given in the Standard Order Process section. Minor typos were corrected. No data information was changed. The metadata available from a harvester may supersede metadata bundled within a download file. Users are advised to compare the metadata dates to determine which metadata file is most recent. 20230301 Susan A Cochran U.S. Geological Survey, Pacific Coastal and Marine Science Center Geologist mailing and physical address

2885 Mission Street

Santa Cruz CA 95060-5792 USA (831) 460-7545 scochran@usgs.gov Vector GT-polygon composed of chains 373 WGS 1984 UTM Zone 10N 0.9996 -123.0 0.0 500000.0 0.0 coordinate pair 0.001 0.001 Meter D WGS 1984 WGS 1984 6378137.0 298.257223563 Habitat_OffshoreHalfMoonBay Polygons representing habitat map units This report OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. Hab_Code Habitat code Center for Habitat Studies, Greene and others (1999, 2007) Names are in text form, maximum length: 20 Hab_Type Habitat type Center for Habitat Studies, Greene and others (1999, 2007) Names are in text form, maximum length: 50 Mega_ID Megahabitat ID code Center for Habitat Studies, Greene and others (1999, 2007) Names are in text form, maximum length: 10 Mega Megahabitat description Center for Habitat Studies, Greene and others (1999, 2007) Names are in text form, maximum length: 35 Ind_ID Seafloor induration ID code Center for Habitat Studies, Greene and others (1999, 2007) Names are in text form, maximum length: 15 Ind Seafloor induration description Center for Habitat Studies, Greene and others (1999, 2007) Names are in text form, maximum length: 35 Sed_ID Sediment ID code Center for Habitat Studies, Greene and others (1999, 2007) Names are in text form, maximum length: 15 Sed Sediment description Center for Habitat Studies, Greene and others (1999, 2007) Names are in text form, maximum length: 35 Mes_Mac_ID Meso/Macro-habitat ID code Center for Habitat Studies, Greene and others (1999, 2007) Names are in text form, maximum length: 35 Mes_Mac Meso/Macro-habitat description Center for Habitat Studies, Greene and others (1999, 2007) Names are in text form, maximum length: 50 Mod_ID Habitat modifier ID code Center for Habitat Studies, Greene and others (1999, 2007) Names are in text form, maximum length: 35 Mod Habitat modifier description Center for Habitat Studies, Greene and others (1999, 2007) Names are in text form, maximum length: 50 Slope_ID Slope modifier ID code Center for Habitat Studies, Greene and others (1999, 2007) Names are in text form, maximum length: 5 Slope Slope description Center for Habitat Studies, Greene and others (1999, 2007) Names are in text form, maximum length: 35 Area_m Polygon area in meters ESRI Calculate Geometry (Area in square meters) tool 2.128734 37673695.7978 Float values in square meters U.S. Geological Survey mailing and physical address

345 Middlefield Rd

Menlo Park CA 94025-3561 USA (650) 329-4309 The .zip file (Habitat_OffshoreHalfMoonBay.zip) includes the .aux, .dbf, .shp, .shx, .sbx, and .sbn files, as well as FGDC-compliant metadata for the habitat data layer of the Offshore of Half Moon Bay, California, map area. Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. shapefile ArcMap (version 10.0, ESRI, 2011) Point, line, and polygon features are in shapefile format and are projected in UTM Zone 10 coordinates. The .zip file includes the .aux, .dbf, .shp, .shx, .sbx, and .sbn files, as well as FGDC-compliant metadata for the habitat data layer of the Offshore of Half Moon Bay, California, map area. WinZip 0.3 https://pubs.usgs.gov/ds/781/OffshoreHalfMoonBay/data/Habitat_OffshoreHalfMoonBay.zip https://pubs.usgs.gov/ds/781/OffshoreHalfMoonBay/data_catalog_OffshoreHalfMoonBay.html https://doi.org/10.3133/ds781 The first link will begin a direct download of the data. The second link is a landing page on which all of the downloadable data for a particular region are listed. The third link is a landing page for the entire data catalog. none 20230301 U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060-5792 US 831-427-4747 pcmsc_data@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 local time