ef_back4.tif: Multibeam Backscatter of the East Flower Garden Region

Metadata also available as - [Outline] - [Parseable text]

Frequently-anticipated questions:

What does this data set describe?
    Title: ef_back4.tif
    Abstract:
    Bathymetry and seafloor backscatter data for the Flower Gardens National Marine Sanctuary are provided in Raster Grid format.

    This data set contains data, metadata, and formal metadata associated with a marine data collection activity referred to by the USGS/CMG Activity ID: A-1-97-GM

    Supplemental_Information:
    Similar information is available for over 1500 other USGS/CMG-related Activities. If known, available are Activity-specific navigation, gravity, magnetics, bathymetry, seismic, and sampling data; track maps; and equipment information; as well as summary overviews, crew lists, and information about analog materials. Primary access to the USGS/CMG Information Bank's digital data, analog data, and metadata is provided through... <http://walrus.wr.usgs.gov/infobank/> This page accomodates a variety of search approaches (e.g., by ship, by region, by scientist, by equipment type, etc.).

    A version of this metadata was orginally written by Peter N. Schweitzer (pschweitzer@usgs.gov) USGS - Reston, VA for Dartnell & Gardener (1999) USGS DDS-55 for TIFF images of the bathymetry and seafloor backscatter for the Flower Gardens National Marine Sanctuary. The existing metadata was modified to describe the bathymetry and backscatter rasters included on Scanlon, Ackerman & Rozycki (2003) USGS 03-002.

  1. How should this data set be cited?

    Dartnell, Peter, and Gardner, James V. , 1999, ef_back4.tif: Sea-Floor Images and Data from Multibeam Surveys in San Francisco Bay, Southern California, Hawaii, the Gulf of Mexico, and Lake Tahoe, California-Nevada U.S. Geological Survey Digital Data Series DDS-55, U.S. Geological Survey, Menlo Park, CA.

    Online Links:

    • http://pubs.usgs.gov/of/2003/of03-002/

    This is part of the following larger work.

    Scanlon, Kathryn M. , Ackerman, Seth D. , and Rozycki, Jill E. , 2003, Texture, Carbonate Content, and Preliminary Maps of Surficial Sediments of the Flower Garden Banks Area, Northwestern Gulf of Mexico Outer Shelf.: Open-File Report 03-002, U.S. Geological Survey, Woods Hole, MA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -93.659555
    East_Bounding_Coordinate: -93.558674
    North_Bounding_Coordinate: 27.986264
    South_Bounding_Coordinate: 27.873043

  3. What does it look like?

    <http://geopubs.wr.usgs.gov/dds/dds-55/pacmaps/images/wf_index.gif> (GIF)
    Index map showing mapped area, coastline, and regional bathymetric contours. 491x417 pixels, 32-bit RGB true color, 30 kbytes.

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

    Calendar_Date: 1997
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: remote-sensing image

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Raster data set. It contains the following raster data types:

      • Dimensions 2509 x 1974 x 1, type Pixel

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

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. 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?

    Band_1

    ObjectID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Value

    Red

    Green

    Blue

    Entity_and_Attribute_Overview:
    Bathymetry values are depth in meters 
    Cell Size = 5.000
Data Type: Floating Point
Number of Rows = 2517
Number of Columns = 2471
    STATISTICS 
    Minimum Value = -178.420
Maximum Value = -16.232
Mean = -107.947
Standard Deviation = 23.573
    Backscatter values are a digital number (DN) associated with the reflected energy off the seafloor 
    Cell Size = 5.000
Data Type: Floating Point
Number of Rows = 2517
Number of Columns = 2471
    STATISTICS 
    Minimum Value = 0.000
Maximum Value = 241.364
Mean = 176.392
Standard Deviation = 8.294
    **NOTE: some of these values may reflect coordinates or statistics of the TIFF images for which this metadata was orginally written and/or to the data prior to reprojection of the grid from UTM zone 15 to NAD83.
    Entity_and_Attribute_Detail_Citation: <http://geopubs.wr.usgs.gov/dds/dds-55/pacmaps/openfile.htm>

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?

    Peter Dartnell
    U.S. Geological Survey, GEO-WRG-MCS
    Mail Stop 999
    Bldg 15, McKelvey Building
    Menlo Park, CA 94025
    USA

    650-329-5460 (voice)
    650-329-5411 (FAX)
    pdartnell@usgs.gov

Why was the data set created?
These data and information are intended for science researchers, students from elementary through college, policy makers, and general public. Pacific Seaflloor Mapping Project Test cruise.

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: Dec-2002 (process 1 of 3)
    Reprojected from UTM Zone 15 (WGS84) to Geographic (NAD83)

    Person who carried out this activity:

    Seth Ackerman
    US Geological Survey
    USGS - Woods Hole Field Center
    Woods Hole, MA 02543
    USA

    508.548.8700 x2315 (voice)
    508.457.2310 (FAX)
    sackerman@usgs.gov

    Date: 08-Jan-2003 (process 2 of 3)
    Metadata imported.

    Person who carried out this activity:

    Seth Ackerman
    US Geological Survey
    USGS - Woods Hole Field Center
    Woods Hole, MA 02543
    USA

    508.548.8700 x2315 (voice)
    508.457.2310 (FAX)
    sackerman@usgs.gov

    Data sources used in this process:

    Date: 21-Feb-2003 (process 3 of 3)
    Metadata edited for this dataset. Raster Backscatter TIFF for the East Flower Garden Bank.

    Person who carried out this activity:

    Seth Ackerman
    US Geological Survey
    USGS - Woods Hole Field Center
    Woods Hole, MA 02543
    USA

    508.548.8700 x2315 (voice)
    508.457.2310 (FAX)
    sackerman@usgs.gov

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

    United States Geological Survey, Coastal and Marine Geology (CMG), Unknown, USGS/CMG Information Bank.

    Online Links:

    Other_Citation_Details: Updated daily

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?

    Complete for the timeframe of original publication

  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: Physical materials are under controlled on-site access.
Use_Constraints:
Please recognize the U.S. Geological Survey (USGS) as the source of this information. Physical materials are under controlled on-site access. Some USGS information accessed through this means may be preliminary in nature and presented without the approval of the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the responsibility of the user. This information is not intended for navigational purposes. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

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

    USGS Information
    Box 25286 Denver Federal Center
    Denver, CO 80225
    USA

    1-888-ASK-USGS (voice)
    303-202-4693 (FAX)
    ask@usgs.gov

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

    USGS Digital Data Series DDS-55

  3. What legal disclaimers am I supposed to read?

    Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.

    Although all data and software published in this report have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and (or) the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS 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: 06-Mar-2003

Metadata author:
Seth Ackerman
U.S. Geological Survey
USGS - Woods Hole Field Center
Woods Hole, MA 02543
USA

508.548.8700 x2315 (voice)
508.457.2310 (FAX)
sackerman@usgs.gov

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

Generated by mp version 2.7.30 on Thu Mar 06 11:23:11 2003