NGDC '073' files

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?
  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 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: NGDC '073' files

Abstract:

A large collection of highly miscellaneous data concerned with sediment grainsizes, and geoacoustic and geotechnical properties.

1. How should this data set be cited?

   National Oceanic and Atmospheri, National Geophysical Data Center (NGDC), and Jenkins, Chris, Unpublished Material, NGDC '073' files.

   Online Links:

   • <http://oas.ngdc.noaa.gov/mgg/plsql/geolin.search_screen>

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -81.927000

   East_Bounding_Coordinate: -65.017000

   North_Bounding_Coordinate: 43.750000

   South_Bounding_Coordinate: 23.020000

3. What does it look like?

   ngdc_073.jpg (JPEG)

   Image map showing extent and distribution of data layer coverage

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

   Beginning_Date: 1970

   Ending_Time: 2000

   Currentness_Reference: ground condition

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

   Geospatial_Data_Presentation_Form: tabular 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):

      • Entity point (6957)

   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 North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.400000.
      The flattening of the ellipsoid used is 1/294.978698.
      

7. How does the data set describe geographic features?

   ngdc_073

   FID

   Internal feature number. (Source: ESRI)

   Sequential unique whole numbers that are automatically generated.

   Shape

   Feature geometry. (Source: ESRI)

   Coordinates defining the features.

   LATITUDE

   LONGITUDE

   SITENAME

   DATASETKEY

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • National Oceanic and Atmospheric Administration (NOAA), National Geophysical Data Center (NGDC)
   • Chris Jenkins

2. Who also contributed to the data set?

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

   Carla Moore
   NOAA National Geophysical Data Center
   E/GC 325 Broadway
   Boulder,, CO 80305-3328
   USA
   

   (303)497-6339 (voice)
   (303)497-6513 (FAX)
   Carla.J.Moore@noaa.gov
   

Data aggregation

1. From what previous works were the data drawn?

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

   Date: 1920 (process 1 of 4)

   Data were downloaded from the NGDC website.

   Person who carried out this activity:
   

   Chris Jenkins
   Institute of Arctic & Alpine Research (INSTAAR) University of Colorado at Boulder
   1560 30th Street
   Boulder, CO 80309-0450
   USA
   

   (303) 492-6387 (voice)
   (303) 492-6388 (FAX)
   chris.jenkins@colorado.edu
   

   Data sources used in this process:

   • <http://oas.ngdc.noaa.gov/mgg/plsql/geolin.search_screen>

   (process 2 of 4)

   Forming the dataset involved integration of the hundreds of separate datasets using a specialized program written by Chris Jenkins. That program formatted the MGD073 format (punch card) into dbSEABED format, applied plausibility error checking, and wrote metadata in the data when inconsistencies were found.

   Person who carried out this activity:
   

   Chris Jenkins
   Institute of Arctic & Alpine Research (INSTAAR) University of Colorado at Boulder
   1560 30th Street
   Boulder, CO 80309-0450
   USA
   

   (303) 492-6387 (voice)
   (303) 492-6388 (FAX)
   chris.jenkins@colorado.edu
   

   (process 3 of 4)

   Suspect Porosity values were caused by digits not being in the right place in 073 files. They were detected by the translating program when <30% or >90%.

   Person who carried out this activity:
   

   Chris Jenkins
   Institute of Arctic & Alpine Research (INSTAAR) University of Colorado at Boulder
   1560 30th Street
   Boulder, CO 80309-0450
   USA
   

   (303) 492-6387 (voice)
   (303) 492-6388 (FAX)
   chris.jenkins@colorado.edu
   

   (process 4 of 4)

   Digital data were checked, formatted to dbSEABED input format, then processed using dbSEABED software to produce a range of output formats. The processing contained quality checking that may have declined to pass faulty or suspect data to outputs. GSM and GSSC datasets were suspect if their totals did not fall within 1% of 100%.

   Person who carried out this activity:
   

   Chris Jenkins
   Institute of Arctic & Alpine Research (INSTAAR) University of Colorado at Boulder
   1560 30th Street
   Boulder, CO 80309-0450
   USA
   

   (303) 492-6387 (voice)
   (303) 492-6388 (FAX)
   chris.jenkins@colorado.edu
   

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

   NOAA National Geophysical Data Center.

   Online Links:

   • <http://oas.ngdc.noaa.gov/mgg/plsql/geolin.search_screen>

   Other_Citation_Details:

   Marine Geology Inventory; World Data Center for Marine Geology & Geophysics, Boulder

1. How well have the observations been checked?

2. How accurate are the geographic locations?

   Positioning technologies were varied.

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: None

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

   National Geophysical Data Center (NGDC)
   E/GC 325 Broadway
   Boulder, CO 80305-3328
   USA
   

   303-497-6826 (voice)
   ngdc.info@noaa.gov
   

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

   NGDC '073' files

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?
   • Availability in digital form:

     Data format:	Size: 0.795

   • Cost to order the data:

Dates:

Last modified: 25-May-2005
Last Reviewed: 03-May-2005

Metadata author:

Jamey Reid
U.S. Geological Survey
IT Specialist (Data Management)
384 Woods Hole Rd.
Woods Hole, MA 02543-1598

(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>