Quadbnd.shp: Digital polygons of 18 individual quadrangles for the Stellwagen Bank National Marine Sanctuary region.

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Frequently-anticipated questions:


What does this data set describe?

Title:
Quadbnd.shp: Digital polygons of 18 individual quadrangles for the Stellwagen Bank National Marine Sanctuary region.
Abstract:
The U.S. Geological Survey, in collaboration with the National Oceanic and Atmospheric Administration's (NOAA) National Marine Sanctuary Program, conducted seabed mapping and related research in the Stellwagen Bank National Marine Sanctuary region from 1993 to 2004. The mapped area is approximately 3,700 km² (1,100 nm²) in size and was subdivided into 18 quadrangles. Several series of sea floor maps of the region based on multibeam sonar surveys have been published. In addition, 2,628 seabed sediment samples were collected and analyzed approximately 10,600 still photographs of the seabed were acquired during the project. These data provide the basis for scientists, policymakers, and managers for understanding the complex ecosystem of the sanctuary region and for monitoring and managing its economic and natural resources.
  1. How should this data set be cited?

    Valentine, Page C. , 2009, Quadbnd.shp: Digital polygons of 18 individual quadrangles for the Stellwagen Bank National Marine Sanctuary region.: U.S. Geological Survey Data Series 469, Version 1.0, U. S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Valentine, Page C. , Gallea, Leslie B. , Blackwood, Dann S. , and Twomey, Erin R. , 2009, Seabed Photographs, Sediment Texture Analyses, and Sun-illuminated Sea Floor Topography in the Stellwagen Bank National Marine Sanctuary Region off Boston, Massachusetts Stellwagen Bank National Marine Sanctuary region off Boston, Massachusetts: U.S. Geological Survey Data Series 469, Version 1.0, U. S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -70.599998
    East_Bounding_Coordinate: -70.033333
    North_Bounding_Coordinate: 42.799999
    South_Bounding_Coordinate: 42.083328

  3. What does it look like?

    <https://pubs.usgs.gov/ds/469/DataCatalog/quadbnd.jpg> (JPEG)
    18 quadrangles of the area studied in the Stellwagen Bank National Marine Sanctuary region

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

    Calendar_Date: 2009
    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 (18)

    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 0.000001. Longitudes are given to the nearest 0.000001. 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.

      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:

  7. How does the data set describe geographic features?

    quadbnd
    Shapefile Attribute Table (Source: ESRI)

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    QUADBND_ID
    Quadrangle number (Source: U.S. Geological Survey)

    Range of values
    Minimum:1
    Maximum:18
    Units:integer count
    Resolution:1

    Perimet_km
    Perimeter of feature in kilometers. (Source: U.S. Geological Survey)

    Range of values
    Minimum:77.855232
    Maximum:78.790718
    Units:Kilometers
    Resolution:.000001

    Area_km
    Area of feature in kilometers. (Source: U.S. Geological Survey)

    Range of values
    Minimum:375.692177
    Maximum:379.292644
    Units:Kilometers
    Resolution:.000001

    Entity_and_Attribute_Overview:
    Eighteen quadrangle boundaries in the Stellwagen Bank National Marine Sanctuary region. Area and perimeter of the eighteen quadrangles are measured in kilometers.


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?

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

    Page C. Valentine
    U.S. Geological Survey
    Research Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x2239 (voice)
    (508) 457-2310 (FAX)
    pvalentine@usgs.gov


Why was the data set created?

The map area is a composite of 18 individual quadrangle maps that represent a total area of 1,100 square nautical miles in the Stellwagen Bank National Marine Sanctuary region. The quadrangles are numbered 1 though 18, beginning in the southwest corner of the map region and increasing from left to right. The dimensions of the map area of each quadrangle are approximately 8 nm east-to-west and 7 nm north-to-south. The map region was subdivided into these 18 quadrangles so that high-resolution maps at a scale of 1:25,000 could be presented in both paper and digital format at a size convenient for the user.


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: 2005 (process 1 of 1)
    18 quadrangles, differing in size, were drawn to represent the area studied in the Stellwagen Bank National Marine Sanctuary region. The quadrangles were created by taking the bounding coordinates of the study area and dividing it up as equally as possible while trying to keep seafloor topography likeness the same in the individual quadrangles. Area and perimeter were generated using XTools Pro's Table Operations to calculate area and perimeter. The output projection is World Mercator using NAD 1983 with the resulting data units in kilometers.

    Person who carried out this activity:

    Page C. Valentine
    U.S. Geological Survey
    Research Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x2239 (voice)
    (508) 457-2310 (FAX)
    pvalentine@usgs.gov

    Data sources produced in this process:
    • quadbnd.zip

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

    Page C. Valentine, editor, 2005, Sea floor image maps showing topography, sun-illuminated topography, backscatter intensity, ruggedness, slope, and the distribution of boulder ridges and bedrock outcrops in the Stellwagen Bank National Marine Sanctuary region off Boston, Massachusetts: Scientific Investigations Map 2840, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

    Other_Citation_Details: 1 DVD-ROM


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

  1. How well have the observations been checked?

    The shapefile was opened in ArcMap 9.3 to check that its bounding coordinates matched those of the study area in the Stellwagen Bank National Marine Sanctuary region.

  2. How accurate are the geographic locations?

    The geographic locations are accurate to 5 meters.

  3. How accurate are the heights or depths?

    The depths are accurate to +/- 0.5 meters.

  4. Where are the gaps in the data? What is missing?

    This shapefile has the locations of the 18 quadrangles drawn to represent the study area of the Stellwagen Bank National Marine Sanctuary region.

  5. How consistent are the relationships among the observations, including topology?

    No other checks for topological consistency were preformed on this data.


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 redistributed 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)

    Page C. Valentine
    U.S. Geological Survey
    Research Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x2239 (voice)
    (508) 457-2310 (FAX)
    pvalentine@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?

    Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. 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?

  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. The data is available to download in WinZip format that was created with WinZip Version 9.0 SR-1 (6224).


Who wrote the metadata?

Dates:
Last modified: 03-Jun-2010
Metadata author:
U.S. Geological Survey
c/o Leslie B. Gallea
GIS Specialist
384 Woods Hole Rd.
Woods Hole, MA 02543-1598
USA

(508) 548-8700 x2341 (voice)
(508) 457-2310 (FAX)
lgallea@usgs.gov

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:


Generated by mp version 2.8.25 on Thu Jun 03 12:26:00 2010