Gmx-grd8bit.sid: Coastal Relief Model Bathymetry image for the Gulf of Mexico

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Frequently-anticipated questions:

What does this data set describe?

Title:
Gmx-grd8bit.sid: Coastal Relief Model Bathymetry image for the Gulf of Mexico
Abstract:
The National Geophysical Data Center assembled a gridded database referred to as the Coastal Relief Model (CRM). NGDC created the comprehensive data set by merging the U.S. Geological Survey 3-arc-second DEMs with a compilation of hydrographic soundings covering the Gulf of Mexico. The Coastal Relief Model extends from the coastal state boundaries to as far offshore as the data will support a continuous view of the seafloor. This dataset formed the basis for the creating of the CRM bathymetry image for this product's GIS.
  1. How should this data set be cited?

    Buczkowski, Brian J. , 2006, Gmx-grd8bit.sid: Coastal Relief Model Bathymetry image for the Gulf of Mexico:,.

    Online Links:

    This is part of the following larger work.

    Buczkowski, B.J., Reid, J.A., Jenkins, C.J., Reid, J.M., Williams, S.J., and Flocks, J.G., 2006, usSEABED: Gulf of Mexico and Caribbean (Puerto Rico and U.S. Virgin Islands) Offshore Surficial Sediment Data Release: Data Series 146, 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: -99.043833
    East_Bounding_Coordinate: -79.467000
    North_Bounding_Coordinate: 31.539667
    South_Bounding_Coordinate: 24.827500

  3. What does it look like?

    gmx_grd.jpg (JPEG)
    Image showing extent of data layer coverage

  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: 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 4404 x 6745 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

    Count

    Band_2

    ObjectID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Value

    Count

    Band_3

    ObjectID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Value

    Count

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 J. Buczkowski
    U.S. Geoogical Survey
    Core Curator and Data Management Specialist
    USGS Woods Hole Science Center
    Woods Hole, MA 02543-1598
    USA

    508-458-8700 x2361 (voice)
    508-457-2310 (FAX)
    bbuczkowski@usgs.gov

Why was the data set created?

This image provides a color view of the CRM for the project area and is used as a basemap for overlaying usSEABED data.

How was the data set created?

  1. From what previous works were the data drawn?

    NGDC CRM, Florida and Eastern Gulf of Mexico, Vol 3 (source 1 of 3)
    , Coastal Relief Model, Florida and Eastern Gulf of Mexico, Vol 3.

    Type_of_Source_Media: CD-ROM
    Source_Contribution:
    Vols 3, 4 and 5 were combined to create the raster grid of the Gulf of Mexico

    NGDC CRM, Central Gulf of Mexico, Vol 4 (source 2 of 3)
    , Coastal Relief Model, Central Gulf of Mexico, Vol 4.

    Type_of_Source_Media: CD-ROM
    Source_Contribution:
    Vols 3, 4 and 5 were combined to create the raster grid of the Gulf of Mexico

    NGDC CRM, Western Gulf of Mexico, Vol 5 (source 3 of 3)
    , Coastal Relief Model, Western Gulf of Mexico, Vol 5.

    Type_of_Source_Media: CD-ROM
    Source_Contribution:
    Vols 3, 4 and 5 were combined to create the raster grid of the Gulf of Mexico

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

    (process 1 of 6)
    The desired data was extracted from the Coastal Relief Model volumes 3, 4 and 5 in the ESRI ASCII format. The ASCII dataset was then converted to an ESRI grid file and combined to a single ESRI grid file.

    Person who carried out this activity:

    Brian J. Buczkowski
    U.S. Geological Survey
    Core Curator and Data Management Specialist
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    508-458-8700 x2361 (voice)
    508-457-2310 (FAX)
    bbuczkowski@usgs.gov

    Data sources produced in this process:
    • gmx_mrg

    (process 2 of 6)
    The grid was hillshaded, usisng ArcMap 3D Analyst .

    Data sources used in this process:

    • gmx_mrg

    Data sources produced in this process:

    • Gmx_mrg_hlshd

    (process 3 of 6)
    The grids gmx_mrg and gmx_mrg_hlshd were overlain and made transparent so the hillshade may be seen beneath the bathymetry directly extracted for the Coastal Relief Model.

    Data sources used in this process:

    • gmx_mrg
    • gmx_mrg_hlshd

    Data sources produced in this process:

    • gmx_mrg
    • gmx_mrg_hlshd

    (process 4 of 6)
    The grid was converted to a tiff image using the extension image_convert_georef.avx downloaded from www.esri.com.

    Data sources used in this process:

    • gmx_mrg
    • gmx_mrg_hlshd

    Data sources produced in this process:

    • gmx_grd.tif
    • gmx_grd.tfw

    (process 5 of 6)
    The tiff image was converted to 8 bit using Photoshop CS in order to reduce the file size.

    Data sources used in this process:

    • gmx_grd.tif
    • gmx_grd.tfw

    Data sources produced in this process:

    • gmx_grd8bit.tif
    • gmx_grd8bit.tfw

    (process 6 of 6)
    The tiff image was compressed using Lizardtech's Mr. Sid compression software.

    Data sources used in this process:

    • gmx_grd8bit.tif
    • gmx_grd8bit.tfw

    Data sources produced in this process:

    • gmx_grd8bit.sid
    • gmx_grd8bit.sdw

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

    National Oceanic and Atmospheri, National Geophysical Data Center (NGDC), 20010907, Coastal Relief Model, Volume 3 (Florida and Eastern Gulf of Mexico), 4 (Central Gulf of Mexico) and 5 (Western Gulf of Mexico).

    Online Links:

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:
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.
Use_Constraints: Bathymetry is not to be used for navigation purposes.

  1. Who distributes the data set?[Distributor contact information not provided.]

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

    Downloadable Data; Marine Aggregate Resources and Processes: gmx_grd8bit.sid

  3. What legal disclaimers am I supposed to read?

    Although this data set has been used by the U.S. Geological Survey (USGS), no warranty, expressed or implied, is made by 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 USGS in the use of these data or related materials.

    Trade, firm, or product names and other references to non-USGS products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy.

  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 09-Feb-2006
Metadata author:
Brian J. Buczkowski
U.S. Geological Survey
Core Curator and Data Management Specialist
384 Woods Hole Road
Woods Hole, MA 02543-1598
USA

508-458-8700 x2361 (voice)
508-457-2310 (FAX)
bbuczkowski@usgs.gov

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

Generated by mp version 2.8.6 on Thu Feb 09 13:38:01 2006