NANAHAB -- Habitat polygons for the nearshore North Anacapa Island, Channel Islands NMS

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Frequently anticipated questions:


What does this data set describe?

Title:
NANAHAB -- Habitat polygons for the nearshore North Anacapa Island, Channel Islands NMS
Abstract:
Benthic habitat polygon coverages have been created for marine reserve locations surrounding the Santa Barbara Basin. Diver, ROV and submersible video transects, bathymetry data, sedimentary samples, and sonar mapping, have been integrated to describe the geological, biological, and oceanographic aspects of habitat. Anacapa Reserve, is part of the Marine Ecological Reserves Research Program (MERRP). The U.S. Geological Survey (USGS), in a cooperative project with Sea Grant-MERRP and investigators at National Marine Fisheries Service (NMFS), the Channel Islands National Marine Sanctuary (CINMS), and National Park Service (NPS) has collected sidescan sonar and video data to produce a polygon coverage. The habitat polygons have attributes for megahabitat, bottom induration, macrohabitat (where macrohabitat observations are available), polygon area, polygon perimeter, and water depth. The habitat GIS shows rocky habitat suitable for rockfish (Sebastes sp.), abalone (Haliotis sp.), and other threatened benthic species from the shoreline out to the 100-m depth limit of the survey.
Supplemental_Information:
Additional information about the field activities from which this data set was derived are available online at http://walrus.wr.usgs.gov/nearshorehab/
  1. How might this data set be cited?
    Cochrane, Guy R., 2002, NANAHAB -- Habitat polygons for the nearshore North Anacapa Island, Channel Islands NMS: Open-File Report 03-085, U.S. Geological Survey, Coastal and Marine Geology Program, Western Coastal and Marine Geology, Menlo Park, CA.

    Online Links:

    This is part of the following larger work.

    Cochrane, Guy R., Nasby, Nicole M., Reid, Jane A., Waltenberger, Ben, and Lee, Kristen, 2003, Nearshore Benthic Habitat GIS for the Channel Islands National Marine Sanctuary and Southern California State Fisheries Reserves, Volume 1: Open-File Report 03-085, U.S. Geological Survey, Coastal and Marine Geology Program, Menlo Park, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -119.457222
    East_Bounding_Coordinate: -119.331139
    North_Bounding_Coordinate: 34.064869
    South_Bounding_Coordinate: 34.005810
  3. What does it look like?
    http://geopubs.wr.usgs.gov/open-file/of03-85/n_ana/nanahab.jpg (JPEG)
    JPEG image of habitat polygons
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2002
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: vector digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • G-polygon (6853)
      • String (32439)
      • GT-polygon composed of chains (12342)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000000. Longitudes are given to the nearest 0.000000. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.
  7. How does the data set describe geographic features?
    nanahab
    FID
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry. (Source: ESRI) Coordinates defining the features.
    AREA
    PERIMETER
    NANHAB_
    NANHAB_ID
    GRID_CODE
    CODE
    MEGA_ID
    BOTTOM_ID
    MSO_MRC_ID
    Entity_and_Attribute_Overview:
    
    NANAHAB.PAT:
    
    COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
        1  AREA                   4    12     F      3
        5  PERIMETER              4    12     F      3
        9  NANAHAB#               4     5     B      -
       13  NANAHAB-ID             4     5     B      -
       17  GRID-CODE              4     8     B      -
       21  MEGA_ID                8     8     C      -
       29  BOTTOM_ID              8     8     C      -
       37  MSO_MRC_ID             8     8     C      -
       45  AREA_SQM               8    18     F      0
       53  PERIM_M                8    18     F      0
       61  CODE                   8     8     C      -
    
    Attributes 6-8 are benthic habitat classification attributes: megahabitat, bottom induration, meso-macrohabitat, and modifiers from Green and others, 1999. CODE is a combination of the habitat attributes. MEGA_ID is usually S for Shelf, but may be F for basin or canyon flank. BOTTOM_ID is h for hard bottom, m for mixed hard and soft bottom, or s for soft sediment bottom MSO_MRC_ID is based on visual observations of kelp (k), sand waves (w) and other macrohabitats described in Greene and others 1999. MDFR_ID are modifiers to describe the texture or lithology of the seafloor such as f for fractured.
    GRID-CODE is used to convert the polygon coverage to a grid, each unique CODE has a corresponding GRID-CODE which is an 8 bit number.
    Entity_and_Attribute_Detail_Citation:
    Habitat attribute types are from Greene, G.H., Yoklavich, M.M., Starr, R.M., O'Connell, V.M., Wakefield, W.W., Sullivan, D.E., McRea, J.E., and Cailliet, G.M., 1999. A classification scheme for deep seafloor habitats. Oceanologica Acta, 22, 663-678.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Guy R. Cochrane
  2. Who also contributed to the data set?
    Thanks to the Staff of the Channel Islands National Marine Sanctuary, the crew of the NOAA R/V Ballena, the crew of the NOAA R/V McArthur, and the crew of the UCSD R/V Sproul.
  3. To whom should users address questions about the data?
    Guy R. Cochrane
    U.S. Geological Survey
    Geophysicist
    400 Natural Bridges Drive
    Santa Cruz, CA
    USA

    (831) 427-4754 (voice)
    (831) 427-4748 (FAX)
    gcochrane@usgs.gov

Why was the data set created?

These data are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) software to display geologic and oceanographic information.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 01-Jan-2001 (process 1 of 1)
    Cochrane, G.R., and K. D. Lafferty, 2002, Use of acoustic classification of sidescan sonar data for mapping benthic habitat in the Northern Channel Islands, California. Continental Shelf Research, 22:683-690.
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    Habitat polygons were hand drawn from a georeferenced sidescan sonar mosaic gif.
    Habitat attribute types are from Greene, G.H., Yoklavich, M.M., Starr, R.M., O'Connell, V.M., Wakefield, W.W., Sullivan, D.E., McRea, J.E., and Cailliet, G.M., 1999. A classification scheme for deep seafloor habitats. Oceanologica Acta, 22, 663-678.
    Macrohabitat attributes assignments are limited to areas where bottom video has been collected.
  2. How accurate are the geographic locations?
    Accuracy of the horizontal coordinates is on the order of 10 m based on uncertainty in position of sidescan sonar fish relative to ships GPS position.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Macrohabitat classification is missing where video information is lacking
  5. How consistent are the relationships among the observations, including topology?
    Polygon topology present. Every polygon has a label and are all polygons closed.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None
Use_Constraints:
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.
  1. Who distributes the data set? (Distributor 1 of 1)
    Guy R. Cochrane
    U.S. Geological Survey
    Geophysicist
    400 Natural Bridges Drive
    Santa Cruz, CA
    USA

    (831) 427-4754 (voice)
    (831) 427-4748 (FAX)
    gcochrane@usgs.gov
  2. What's the catalog number I need to order this data set? Downloadable Data
  3. What legal disclaimers am I supposed to read?
    Although these data have been used by the U.S. Geological Survey (USGS), U.S. Department of the Interior (DOI), no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials.
    Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: The SHP file contains the geospatial data. The SHX file contains the index of the geospatial data. The DBF file contains the attribute data in dBase format. The PRJ file contains the coordinate system information (optional). The AVL file contains the legend information (optional). The SBN and SBX files contain the spatial index of the geospatial data (optional). The XML file contains the metadata describing the data set <data set name>.shp.xml. An ASCII version of the metadata file. A browse graphic showing the data layer coverage and extent (optional). in format SHP (version 3.3) ESRI Shapefile format Size: 15.210
      Network links: http://geopubs.wr.usgs.gov/open-file/of03-85/n_ana/nanahab.tgz
      http://geopubs.wr.usgs.gov/open-file/of03-85/4_catalog.html
    • Cost to order the data: None

  5. What hardware or software do I need in order to use the data set?
    These data are available in Environmental Systems Research Institute (ESRI) shapefile format. The user must have ArcGIS or ArcView 3.0 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of the importing data. A free data viewer, arcexplorer, capable of displaying the data is available from ESRI at www.esri.com.

Who wrote the metadata?

Dates:
Last modified: 22-Jun-2006
Last Reviewed: 15-Jul-2003
Metadata author:
Guy R. Cochrane
U.S. Geological Survey
Geophysicist
400 Natural Bridges Drive
Santa Cruz, CA
USA

(831) 427-4754 (voice)
(831) 427-4748 (FAX)
gcochrane@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/westcoast/socal/cinms/nanahab.shp.faq.html>
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