Coastal Relief Model Bathymetry image for the Gulf of Mexico area

Frequently-anticipated questions:

• What does this data set describe?
  1. How should this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
• 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 data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

Title:

Coastal Relief Model Bathymetry image for the Gulf of Mexico area

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 East Coast. 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?

   U.S. Geological Survey, and Reid, Jamey, 2003, Coastal Relief Model Bathymetry image for the Gulf of Mexico area:.

   Online Links:

   • <https://pubs.usgs.gov/dds/dds79>

   This is part of the following larger work.

   Williams, S.J., Reid, J.M., Cross, V., and Polloni, C., 2003, Coastal Erosion and Wetland Change in Louisiana: Selected USGS Products: Digital Data Series, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Field Center, Woods Hole, MA.

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -96.526090

   East_Bounding_Coordinate: -84.223639

   North_Bounding_Coordinate: 30.907927

   South_Bounding_Coordinate: 24.962118

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: 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 7135 x 14763 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

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • U.S. Geological Survey
   • Jamey Reid

2. Who also contributed to the data set?

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

   Jamey M. Reid
   U.S. Geological Survey
   IT Specialist (Data Management)
   Woods Hole Field Center
   Woods Hole, MA 02543-1598
   USA
   

   508-548-8700 x2204 (voice)
   508-457-2310 (FAX)
   jreid@usgs.gov
   

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

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 region and the East coast of Florida.

   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 region and the East coast of Florida.

   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 region and the East coast of Florida.

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

   (process 1 of 4)

   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:
   

   Seth Ackerman
   U.S. Geological Survey
   384 Woods Hole Road
   Woods Hole, MA 02543-1598
   USA
   

   508-548-8700 x2315 (voice)
   508-457-2310 (FAX)
   sackerman@usgs.gov
   

   (process 2 of 4)

   The ESRI grid was file was clipped to the desired area.

   Person who carried out this activity:
   

   Jamey M. Reid
   U.S. Geological Survey
   Woods Hole Field Center
   Woods Hole, MA 02543-1598
   USA
   

   508-548-8700 x2204 (voice)
   508-457-2310 (FAX)
   jreid@usgs.gov
   

   (process 3 of 4)

   Hillshade of the clipped grid was created using ArcMap. (Azimuth:315; Altitude: 45; z factor: 0.0005)

   Person who carried out this activity:
   

   Jamey M. Reid
   U.S. Geological Survey
   IT Specialist (Data Management)
   Woods Hole Field Center
   Woods Hole, MA 02543-1598
   USA
   

   508-548-8700 x2204 (voice)
   508-457-2310 (FAX)
   jreid@usgs.gov
   

   (process 4 of 4)

   The grid and hillshade were combined to create a tiff image using the extension image_convert_georef.avx downloaded from www.esri.com. The tiff image was compressed using Lizardtech's Mr. Sid compression software.

   Person who carried out this activity:
   

   VeeAnn Cross
   U.S. Geological Survey
   Woods Hole Field Center
   Woods Hole, MA 02543-1598
   USA
   

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

   Data sources used in this process:

   • gom_cliptst.tif
   • gom_cliptst.tfw

   Data sources produced in this process:

   • gmx_crm.sid
   • gmx_crm.sdw

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?

Are there legal restrictions on access or use of the data?

Access_Constraints: None

Use_Constraints: This data set 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; National Assessment of Sand and Gravel Resources: gmx_crm.sid

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.

4. How can I download or order the data?
   • Availability in digital form:

     Data format:	Mr Sid Size: 7.006

   • Cost to order the data:

Dates:

Last modified: 25-Jun-2003

Metadata author:

U.S. Geological Surveuy
c/o Jamey M. Reid
IT Specialist (Data Management)
Woods Hole Field Center
Woods Hole, MA 02543-1598
USA

508-548-8700 x2204 (voice)
508-457-2310 (FAX)
jreid@usgs.gov

Metadata standard:

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

Metadata extensions used:

• <http://www.esri.com/metadata/esriprof80.html>