Coverage secruchab -- Habitat polygons for Santa Cruz Island

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Frequently-anticipated questions:

What does this data set describe?

Title: Coverage secruchab -- Habitat polygons for Santa Cruz Island
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/>

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 ArcInfo format, this metadata file may include some ArcInfo-specific terminology.

  1. How should this data set be cited?

    Cochrane, Guy R. , 2005, Coverage secruchab -- Habitat polygons for Santa Cruz Island:.

    Online Links:

    This is part of the following larger work.

    Cochrane, Guy R. , Conrad, James E. , Reid, Jane A. , Fangman, Sarah, and Golden, Nadine, 2005, Nearshore Benthic Habitat GIS for the Channel Islands National Marine Sanctuary and Southern California State Fisheries Reserves, Volume II Edition: 1.0: Open-File Report USGS OFR 2005-1170, U.S. Geological Survey, Coastal and Marine Geology Program, Western Coastal and Marine Geology, Santa Cruz, CA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -119.723930
    East_Bounding_Coordinate: -119.58984
    North_Bounding_Coordinate: 33.991569
    South_Bounding_Coordinate: 33.932464

  3. What does it look like?

    <http://pubs.usgs.gov/of/2005/1170/images/secruhab.html> (JPEG)
    JPEG image of habitat polygons

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: 1999
    Currentness_Reference: Ground Condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: map

  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 (85259)

    2. What coordinate system is used to represent geographic features?

      The map projection used is NAD_1983_UTM_Zone_10N.

      Projection parameters:
      Straight-Vertical_Longitude_from_Pole: -123
      Standard_Parallel: 0.999600
      False_Easting: 500000.000
      False_Northing: 0.000

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest .000032
      Ordinates (y-coordinates) are specified to the nearest .000032
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic ReferenceSystem 80.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.2572222.

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview: 

    
secruhab Fields:

NAME		ALIAS	TYPE	LENGTH	PRECISION	SCALE	NUMBER_FORMAT
ID	  	ID	Double      10         10           0	      Numeric
GRIDCODE        GRIDCODE	Double      10         10           0         Numeric
CODE      	CODE   	String      10         10           0               -
MEGA_ID   	MEGA_ID String       5          0           0               -
MSO_MRC_ID    MSO_MRC_ID String       5          0           0               -
MDFR_ID		MDFR_ID	String       5          0           0               -
BOTTOM_ID      BOTTOM_ID String       5          0           0               -
GEO_UNIT	       GEO_UNIT String	    50		0	    0		    -
Area		Area	Double	    19         18          11          Numeric
    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 are visual observations when sand waves (w) were observed. These macrohabitats described in Greene and others 1999. MDFR_ID are modifiers to describe the texture or lithology of the seafloor and appear in the code preceded by an underscore (_). Including; fractured (_f), differently eroded (_d), kelp (_k), and limestone (_l)

    Entity_and_Attribute_Detail_Citation:
    Habitat attribute types are Modified after 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)

  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 MacArthur, and the crew of the UCSD R/V Sproul.

  3. To whom should users address questions about the data?

    Guy R. Cochrane
    United States Geological Survey (USGS)
    Geophysicist
    USGS, 400 Natural Bridges Drive
    Santa Cruz, CA 95060-5792
    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: 10-Dec-2005 (process 1 of 1)
    //Create coast grid 1. Created polygon feature class of portion of ca coast line needed in ArcGIS by tracing the coast shape file. created: coast_poly.shp 2. Converted polygon feature class to grid using ArcMap Spatial Analyst-->convert feature to raster. created: coast_mask ---------------------------------------------------------------------------------------- //Calculated no data where there is land 1. Created shapefile mask -create new polygon feature class in ArcCatlog -add new polygon to project -using ArcMap Editor make new polygon a rectangle around all data -in arctoolbox-->analysis tool-->overlay-->erase erase coast_poly polygon from new rectangle polygon new shapefile_erase has hole of island data -in spatial analyst-->options-->set mask-->use drop down to select newerase shapefile 2. Recalculated secru1mhabg with new mask poly by using the spatial analyst's raster calculator [secru1mhab1g] = [secru1mhabg] --> select evaluate resulting grid has a hole (no data) where land was //Set all 0 data to no data 1. Spatial analyst raster calculator divide grid by itself secru1mhab1g/secru1mhab1g where 0/0 will equal no data all other data will be equal to 1 calculation leaves you with value 1 where there was data 2. Spatial analyst raster calculator multiply new calculation by original grid: secru1mhab1g * [Calculation] (note: result is Calcultion2) so all values * 1 gives you original data ------------------------------------------------------------------------------------------- //Calculated new grid with cleaned near shore data (from mud to rock) 1. created update rock grid. -used gridpaint tool to paint in additional rock near shore area in rock only grid 2. Merged new rock grid with previous all hab grid in Spatial Analyst tool Raster Calculator -set option to Extent-->union of inputs. -in raster calculator dialogue box merge grids of rck and hab: [secru1mhab4g] = merge([secru_rock3 - secru_rock3],[Calculation2 ]) 3. Cleaned up painted in data outside sonar area -Convert new grid to polygon. -Use ArcToolbox Earse tool with "cookie cutter" made from entire sonar area. ------------------------------------------------------------------------------------------- //Filtered grid to decrease polygon total steps: 1. filtered original grid using the "low" filter default filter secru1mhab5g secru1mhab6g 2. reclassified new grid using spatial anlysis reclassification option and the following remap categories: 1 128 : 85 129 189 : 170 190 225 : 255 3. converted new floating point grid to an integer grid. secru1mhab8g = int(secru1mhab7g) 4. converted new floating integer grid to polygon shapefile using Toolbox Raster to Features: new polygon shapefile: 85,257 polygons original polygon shapefile: 171,781 polygons

  3. What similar or related data should the user be aware of?

    United States Geological Survey, Coastal and Marine Geology (CMG), 20020916, USGS CMG Southeast Santa Cruz Habitat Metadata.

    Online Links:

    This is part of the following larger work.

    United States Geological Survey, Coastal and Marine Geology (CMG), 2005, USGS CMG InfoBank.

    Online Links:

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 georefereced sidescan sonar mosaic tiff.

    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 sidescansonar 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: Not suitable for navigation

  1. Who distributes the data set? (Distributor 1 of 1)

    United States Geological Survey (USGS)
    c/o Guy R. Cochrane
    Geophysicist
    USGS, 400 Natural Bridges Drive
    Santa Cruz, CA 95060-5792
    USA

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

  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    Please recognize the U.S. Geological Survey (USGS) as the source of this information.

    Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, 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 U.S. Geological Survey in the use of this data, software, or related materials.

  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 2005
Last Reviewed: 2005
Metadata author:
United States Geological Survey (USGS)
c/o Guy R. Cochrane
Geophysicist
USGS, 400 Natural Bridges Drive
Santa Cruz, CA 95060-5792
USA

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

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata ("CSDGM version 2") (FGDC-STD-001-1998)

Generated by mp version 2.8.6 on Fri Dec 16 16:21:26 2005