bathy_500m - 500m Bathy Contours Derived from ETOPO2 Global 2' Elevations

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Frequently-anticipated questions:

What does this data set describe?

Title:
bathy_500m - 500m Bathy Contours Derived from ETOPO2 Global 2' Elevations
Abstract:
This bathymetry contour data is in ESRI shapefile format and was derived from a National Oceanic Atmospheric Administration, National Geophysical Data Center (NOAA-NGDC) ETOPO2 data set; using an ESRI ArcView extension, Spatial Analyst, to create 500m intervals from a gridded database file (2-minute latitude - longitude resolution).
  1. How should this data set be cited?

    U.S. Geological Survey, 2004, bathy_500m - 500m Bathy Contours Derived from ETOPO2 Global 2' Elevations: Open-File Report 2004-1400, 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.

    Brink, Uri ten , Danforth, William, Polloni, Chris, Parker, Castle Eugene , Uozumi, Toshi, and Williams, Glynn, 2004, Project PROBE Leg II - Final Report and Archive of Swath Bathymetric Sonar, CTD/XBT and GPS Navigation Data Collected During USGS Cruise 03008 (NOAA Cruise RB0303) Puerto Rico Trench 18 February - 7 March, 2003: Open-File Report 2004-1400, 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: -78.988024
    East_Bounding_Coordinate: -54.880239
    North_Bounding_Coordinate: 23.982036
    South_Bounding_Coordinate: 9.934132

  3. What does it look like?

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

    Calendar_Date: 2001
    Currentness_Reference: publication date

  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 (1440)

    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 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:
      Altitude_System_Definition:
      Depth_System_Definition:

  7. How does the data set describe geographic features?

    bathy_500m
    Shapefile Attribute Table (Source: None)

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    ID
    Unique sequential number assigned to identify feature (Source: ESRI)

    Coordinates defining the features.

    CONTOUR
    Depth values (elevation) recorded as meter values. Depths are recorded as negative values. (Source: Chris Polloni)

    Range of values
    Minimum:-8500
    Maximum:0
    Units:meters
    Resolution:10

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?

    National Oceanic and Atmospheric Administration (NOAA), National Geophysical Data Center (NGDC) for creating the ETOPO2 dataset from which the contours were derived.

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

    Chris Polloni
    U.S. Geological Survey
    Information Specialist
    384 Woods Hole Road
    Woods Hole, Massachusetts 02543-1598
    USA

    (508) 548-8700 x2280 (voice)
    (508) 457-2310 (FAX)
    cpolloni@usgs.gov

    Hours_of_Service: 8:00AM to 5:00PM: M-F

Why was the data set created?

This dataset supplements the main featured mosaic images of the Puerto Rico trench survey with a Caribbean Sea below ocean surface relief model.

How was the data set created?

  1. From what previous works were the data drawn?

    etopo2 (source 1 of 1)
    National Oceanic Atmospheric Ad, National Geophysical Data Center (NGDC), 2001, ETOPO2 Global 2' Elevations.

    Online Links:

    Type_of_Source_Media: CD-ROM
    Source_Contribution:
    The ETOPO2 CD-ROM is the original source data from which the bathymetric contours were derived. These data are available from the National Oceanic and Atmospheric Administration (NOAA), National Geophysical Data Center (NGDC)

  2. How were the data generated, processed, and modified?

    Date: 2003 (process 1 of 4)
    The desired data was extracted from the ETOPO2 CDROM in the ESRI ASCII format in 45-degree blocks using GEODAS grid translator version 4.1.16.

    Person who carried out this activity:

    VeeAnn A. Cross
    U.S. Geological Survey
    Marine Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700 2251 (voice)
    (508) 457-2310 (FAX)
    vatnipp@usgs.gov

    Hours_of_Service: 8AM to 5PM; M-F
    Date: 2003 (process 2 of 4)
    The ASCII grids were then converted to ESRI grid files and assigned Geographic, NAD83 projection information using Arc/Info version 8.2.

    Person who carried out this activity:

    VeeAnn A. Cross
    U.S. Geological Survey
    Marine Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700 x2251 (voice)
    (508) 457-2310 (FAX)
    vatnipp@usgs.gov

    Date: 2004 (process 3 of 4)
    Bathymetric lines were derived from the temporary grid data set. ArcView 3.2 with Spatial Analyst extension version 1.1 Surface Menu selection "Create Contours" was used to derive relief representing below surface isolines. ArcView "Query Builder" formula tool was used to isolate and derive 500m contour bathymetry intervals.

    Person who carried out this activity:

    Chris Polloni
    U.S. Geological Survey
    Information Specialist
    384 Woods Hole Road
    Woods Hole, Massachusetts 02543-1598
    USA

    (508) 548-8700 x2280 (voice)
    (508) 457-2310 (FAX)
    cpolloni@usgs.gov

    Hours_of_Service: 8AM to 5PM; M-F
    (process 4 of 4)
    This shapefile's coordinate system was re-assigned to Geographic, Geodetic Model: WGS84 in ESRI's ArcMap (Version 8.2) using Arctoolbox Projection tool (Version 8.3)

    Person who carried out this activity:

    Glynn Williams
    U.S. Geological Survey
    Spatial Analyst
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x2290 (voice)
    (508) 457-2310 (FAX)
    gwilliams@usgs.gov

    Hours_of_Service: 8:00AM to 4:30PM; M - F
    Data sources produced in this process:
    • bathy_500m.shp
    • bathy_500m.dbf
    • bathy_500m.shx
    • bathy_500m.prj

  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?

  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?

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

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)

    Uri ten Brink
    U.S. Geological Survey
    Research Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

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

    Hours_of_Service: 8AM to 5PM; M-F
  2. What's the catalog number I need to order this data set?

    Downloable Data: Open-File Report 2004-1400

  3. What legal disclaimers am I supposed to read?

    Although this dataset has been used by National Oceanic and Atmospheric Administration, National Geophysical Data Center, and The U.S. Geological Survey, no warranty, expressed or implied, is made by NOAA, NGDC or the USGS as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the NOAA, NGDC or the USGS in the use of these data or related materials.

  4. How can I download or order the data?

  5. What hardware or software do I need in order to use the data set?

    The data is available in Environmental Systems Research Institute, Inc. (ESRI) shapefile format. The user must have ArcView 3.+ or ArcGIS 8.+ to read and process the data file. In lieu of ArcView/ArcGIS, the user may utilize another GIS application package capable of importing data.

Who wrote the metadata?

Dates:
Last modified: 26-Oct-2004
Metadata author:
Glynn Williams
U.S. Geological Survey
Spatial Data Technician
384 Woods Hole Road
Woods Hole, Massachusetts 02543-1598
USA

(508) 548-8700 x2290 (voice)
(508) 457-2310 (FAX)
gwilliams@usgs.gov

Hours_of_Service: 8:00AM to 5:00PM; M-F
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.8.18 on Fri Dec 17 15:00:45 2004