CRM_HILLSHADE.TIF - Northern Gulf of Mexico Shaded Relief Image

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

Frequently-anticipated questions:


What does this data set describe?

Title: CRM_HILLSHADE.TIF - Northern Gulf of Mexico Shaded Relief Image
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 US coastal areas. 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. Land has been excluded from the image.
  1. How should this data set be cited?

    U.S. Geological Survey, 2005, CRM_HILLSHADE.TIF - Northern Gulf of Mexico Shaded Relief Image: Open-File Report 2005-1071, 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.

    Twichell, D.C., Cross, V.A., Paskevich, V.F., Hutchinson, D.R., Winters, W.J., and Hart, P.E., 2005, GIS of selected geophysical and core data in the northern Gulf of Mexico continental slope collected by the U.S. Geological Survey: Open-File Report 2005-1071, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

    Other_Citation_Details: 1 DVD-ROM

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -99.000000
    East_Bounding_Coordinate: -78.999247
    North_Bounding_Coordinate: 31.000805
    South_Bounding_Coordinate: 24.000000

  3. What does it look like?

    <http://pubs.usgs.gov/of/2005/1071/data/background/ngdc/crm_hillshade-thumb.gif> (GIF)
    Thumbnail image showing overview of extent and coverage of data layer.
    <http://pubs.usgs.gov/of/2005/1071/data/background/ngdc/crm_hillshade.gif> (GIF)
    Overview image showing the extent and coverage of the data layer.

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

    Calendar_Date: 2001
    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 8299 x 20380 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. Latitudes are given to the nearest 0.00083333. Longitudes are given to the nearest 0.00083333. 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
    8-bit grayscale image

    ObjectID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Value

    Red

    Green

    Blue

    Red

    Green

    Blue

    Entity_and_Attribute_Overview: There are no attributes associated with the GEOTIFF image.


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?

    Please credit the National Oceanic and Atmospheric Administration (NOAA), National Geophysical Data Center (NGDC) as the originator of the Coastal Relief Model used as the data source.

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

    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


Why was the data set created?

This image provides a basemap shaded relief image of the Gulf of Mexico for various projects within the U.S. Geological Survey (USGS), Coastal and Marine Geology Program.


How was the data set created?

  1. From what previous works were the data drawn?

    NGDC (source 1 of 1)
    National Oceanic and Atmospheri, National Geophysical Data Center (NGDC), 2001, Coastal Relief Model, Volumes 1-8.

    Online Links:

    Type_of_Source_Media: CD-ROM
    Source_Contribution:
    The source for these data are the Coastal Relief Model CD-ROMs, Volumes 1-8. 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 Coastal Relief Model volumes 1-8 in the ESRI ASCII format in 1-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 x2251 (voice)
    (508) 457-2310 (FAX)
    vatnipp@usgs.gov

    Hours_of_Service: Monday-Friday, 8am-5pm, Eastern Standard Time
    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

    Hours_of_Service: Monday-Friday, 8am-5pm, Eastern Standard Time
    Date: 2003 (process 3 of 4)
    The hillshade was created using ArcGIS with the default sun illumination angle and a vertical exaggeration of 0.00005.

    Person who carried out this activity:

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

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

    Hours_of_Service: Monday-Friday, 8am-5pm, Eastern Standard Time
    Date: 2003 (process 4 of 4)
    The grid was converted to a TIF image

    Person who carried out this activity:

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

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

    Data sources produced in this process:
    • crm_hillshade.tif

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

    National Oceanic and Atmospheri, National Geophysical Data Center (NGDC), 2001-2003, Coastal Relief Model, Volumes 1-8.

    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: 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)

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

    (508) 548-8700 x2251 (voice)
    (508) 457-2310 (FAX)
    vatnipp@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?

    Although this dataset has been used by the U.S. Geological Survey, 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.

    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 image is available as a GEOTIFF image with an accompanying world file. To utilize this data, the user must have an image viewer, image processing or GIS software package capable of importing a GeoTIFF image.


Who wrote the metadata?

Dates:
Last modified: 21-Nov-2003
Last Reviewed: 19-Oct-2005
Metadata author:
U.S. Geological Survey
c/o David C. Twichell
Oceanographer
384 Woods Hole Rd.
Woods Hole, MA 02543-1598
USA

(508) 548-8700 x2266 (voice)
(508) 457-2310 (FAX)

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


Generated by mp version 2.8.6 on Mon Jan 30 14:07:00 2006