CCB_5MCNTR: Bathymetric depth contours at 5 meter intervals of interferometric sonar data collected offshore of Massachusetts within northern Cape Cod Bay (ESRI Shapefile, Geographic, WGS84).

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Frequently-anticipated questions:

What does this data set describe?

Title:
CCB_5MCNTR: Bathymetric depth contours at 5 meter intervals of interferometric sonar data collected offshore of Massachusetts within northern Cape Cod Bay (ESRI Shapefile, Geographic, WGS84).
Abstract:
These data were collected under a cooperative agreement with the Massachusetts Office of Coastal Zone Management (CZM) and the U.S. Geological Survey (USGS), Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center (WHCMSC). Initiated in 2003, the primary objective of this program is to develop regional geologic framework information for the management of coastal and marine resources. Accurate data and maps of sea-floor geology are important first steps toward protecting fish habitat, delineating marine resources, and assessing environmental changes due to natural or human impacts. The project is focused on the inshore waters of coastal Massachusetts, primarily in water depths of 3-30 meters deep. Data collected for the mapping cooperative have been released in a series of USGS Open-File Reports (<http://woodshole.er.usgs.gov/project-pages/coastal_mass/html/current_map.html>). The data collected in the study area located in northern Cape Cod Bay Massachusetts includes high-resolution geophysics (bathymetry, backscatter intensity, and seismic reflection), and ground validation (sediment samples, video tracklines, and bottom photographs). The data were collected during five separate surveys conducted between 2006 and 2008 and cover 480 square kilometers of the inner continental shelf.

More information about the individual USGS surveys conducted as part of the northern Cape Cod Bay project can be found on the Woods Hole Coastal and Marine Science Center Field Activity webpage:

06012: <http://quashnet.er.usgs.gov/data/2006/06012/> 07001: <http://quashnet.er.usgs.gov/data/2007/07001/> 07002: <http://quashnet.er.usgs.gov/data/2007/07002/> 07003: <http://quashnet.er.usgs.gov/data/2007/07003/> 08002: <http://quashnet.er.usgs.gov/data/2008/08002/>

  1. How should this data set be cited?

    U.S. Geological Survey, 2010, CCB_5MCNTR: Bathymetric depth contours at 5 meter intervals of interferometric sonar data collected offshore of Massachusetts within northern Cape Cod Bay (ESRI Shapefile, Geographic, WGS84).: Open-File Report 2010-1006, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts.

    Online Links:

    This is part of the following larger work.

    Andrews, Brian D. , Ackerman, Seth D. , Baldwin, Wayne E. , and Barnhardt, Walter A. , 2010, Geophysical and Sampling Data from the Inner Continental Shelf: Northern Cape Cod Bay, Massachusetts.: Open-File Report 2010-1006, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -70.637070
    East_Bounding_Coordinate: -70.175738
    North_Bounding_Coordinate: 42.089356
    South_Bounding_Coordinate: 41.935027

  3. What does it look like?

    <https://pubs.usgs.gov/of/2010/1006/GIS/browse_jpg/CCB_5mCntr.jpg> (JPEG)
    Thumbnail image of depth contours of gridded bathymetry collected in the Cape Cod Bay Massachusetts survey area.

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

    Beginning_Date: 16-Aug-2006; 20070429; 20070725; 20080429
    Ending_Date: 23-Aug-2006; 20070503; 20070807; 20080507
    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):

      • String (81)

    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 D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.

      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: Mean lower low water
      Depth_Resolution: 0.5 meters
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates

  7. How does the data set describe geographic features?

    CCB_5mCntr
    5 meter bathymetric contours (Source: USGS)

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    CONTOUR
    Depth of contour below mean lower low water (Source: USGS)

    Range of values
    Minimum:-60
    Maximum:-5

    Shape_Leng
    Length of feature in meters (UTM 19, WGS84) automatically calculated in feature class before it was exported to a shapefile (Source: USGS)

    Range of values
    Minimum:508.9
    Maximum:44,981.8

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?

    Brian Andrews
    U.S. Geological Survey
    Geographer
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598
    USA

    508-548-8700 x2348 (voice)
    508-457-2310 (FAX)
    bandrews@usgs.gov

Why was the data set created?

The purpose of this polyline shapefile is to show bathymetric contours at 5 meter intervals derived from bathymetry collected during the four surveys (06012, 07001, 07002, 08002) in the northern Cape Cod Bay survey area.

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: 23-Jul-2010 (process 1 of 3)
    Generalize the input depth raster: The input raster (ccb_bath_f) was smoothed and aggregated using ArcGIS 9.3 geoprocessing steps described below below: 1) Smooth input grid using a 5x5 mean filter with the Block Statistics Tool in ArcToolbox (ver. 9.3) Input raster = ccb_bath_f, Output raster = BlockSt_ccb_1, Neighborhood= Rectangle, Neighborhood Settings = 5 x 5, cell Statistics type = Mean, Ignore NoData in calculations=Unchecked.

    2) Convert resolution of input raster (BlockSt_ccb_1) from 5-m per pixel to 50-m per pixel using the aggregate tool in ArcToolbox (ver. 9.3) Input raster = BlockSt_ccb_1, Output raster aggr10x, Cell Factor = 10 Aggregation technique = mean, Expand extent if needed = Unchecked, Ignore NoData in calculations = Unchecked

    Person who carried out this activity:

    Brian Andrews
    U.S. Geological Survey
    Geographer
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598
    USA

    508-548-8700 x2348 (voice)
    508-457-2310 (FAX)
    bandrews@usgs.gov

    Data sources used in this process:
    • ccb_bath_f (This publication)

    Date: 23-Jul-2010 (process 2 of 3)
    Calculate generalized depth contours from smoothed and aggregated input depth grid using ArcToolbox (ver. 9.3). Created new File Geodatabase to store feature classes produced in this step. Both input depth grid and output feature class are in the UTM Zone 19, WGS84 Coordinate System. 1) Contour Input raster = ccbaybath50m, Output polyline features = CCBathCntr5mAll (feature class) Contour Interval = 5 Base Contour = 0 Z Factor = 1.

    2) Make Feature Layer: This tool makes a feature layer using only contours with shape_length greater than 500 m to remove the small closed contours. Input Features = CCBathCntr5mAll, Output Layer = CCBathCntr5mAll_Layer, Expression = Shape_Length > 500

    3) Simplify Line: Input Features = CCBathCntr5mAll_Layer, Output Feature Class = CCBathCntr5m_Simple250, Simplification Algorithm = Bend_Simplify, Reference Baseline = 250, Meters, Check for topological errors and Resolve topological errors options were both selected.

    4) Smooth Line: Input Features = CCBathCntr5m_Simple250, Output Feature Class = CCBathCntr5m_SimpleSmooth, Smoothing Algorithm = Bezier_Interpolation Handling Topological Errors = No_Check

    Person who carried out this activity:

    Brian Andrews
    U.S. Geological Survey
    Geographer
    384 Woods Hole Rd
    Woods Hole, MA 02543-1598
    USA

    508-548-8700 x2348 (voice)
    508-457-2310 (FAX)
    bandrews@usgs.gov

    Date: 23-Jul-2010 (process 3 of 3)
    Project final contours from UTM Zone 19, WGS84 to Geographic Coordinate System, WGS84 using ArcToolbox (ver 9.3). During projection process the feature class is exported from the file geodatabase feature class to a shapefile.

    Tool = DataManagement>Project Input Dataset or Feature Class = CCBathCntr5m_SimpleSmooth (feature class) Output Dataset or Feature Class = CCB_5mCntr.shp (shapefile) Input Coordinate System = WGS_1984_UTM_Zone_19N Output Coordinate System = WGS_1984

    Person who carried out this activity:

    Brian Andrews
    U.S. Geological Survey
    Geographer
    384 Woods Hole Rd
    Woods Hole, MA 02543-1598
    USA

    508-548-8700 x2348 (voice)
    508-457-2310 (FAX)
    bandrews@usgs.gov

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

    Barnhardt, Walter A. , Andrews, Brian D. , and Butman, Bradford, 2006, High-Resolution Mapping of the Inner Continental Shelf: Nahant to Gloucester, Massachusetts: Open-File Report 2005-1293, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, Massachusetts.

    Online Links:

    Ackerman, Seth D. , Butman, Bradford, Barnhardt, Walter A. , Danforth, William W. , and Crocker, James M. , 2006, High-Resolution Geologic Mapping of the Inner Continental Shelf: Boston Harbor and Approaches, Massachusetts: Open-File Report 2006-1008, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, Massachusetts.

    Online Links:

    Barnhardt, Walter A. , Andrews, Brian D. , Ackerman, Seth D. , Baldwin, Wayne E. , and Hein, Christopher J. , 2009, High-Resolution Geological Mapping of the Inner Continental Shelf: Cape Ann to Salisbury Beach, Massachusetts: Open-File Report 2007-1373, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, Massachusetts.

    Online Links:

    Barnhardt, Walter A. , Ackerman, Seth D. , Andrews, Brian D. , and Baldwin, Wayne E. , 2010, Geophysical and Sampling Data from the Inner Continental Shelf: Duxbury to Hull, Massachusetts: Open-File Report 2009-1072, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, Massachusetts.

    Online Links:

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

  1. How well have the observations been checked?

    The CONTOUR and Shape_Length attributes for this shapefile are generalized and described further in the processing step section of data quality below.

  2. How accurate are the geographic locations?

  3. How accurate are the heights or depths?

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

    Small depth contours less than 500 meters in length were removed to improve cartographic display.

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

    Bathymetric contours were simplified and smoothed to improve cartographic display of contours.

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)

    Brian Andrews
    U.S. Geological Survey
    Geographer
    384 Woods Hole Rd.
    Woods Hole, MA 02543
    USA

    508-548-8700 x2348 (voice)
    bandrews@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?

    This zip file contains data available in Environmental Systems Research Institute (ESRI) shapefile format. The user must have software capable of uncompressing the WinZip file and displaying the shapefile. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of importing the 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: 23-Aug-2010
Metadata author:
Brian Andrews
U.S. Geological Survey
Geographer
384 Woods Hole Rd.
Woods Hole, MA 02543-1598
USA

508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@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 Mon Aug 23 12:59:37 2010