U.S. Geological Survey Open-File Report 02-002

CERCNAV: Navigation Points for CERC Cores

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: CERCNAV: Navigation Points for CERC Cores

Abstract:

This GIS layer contains the station navigation for the U.S. Army Corps of Engineers Coastal Engineering Research Center (CERC) cores collected in Long Island Sound. These cores were originally collected in 1967 as part of the Inner Continental Shelf Sediment and Structure (ICONS) program to appraise sand resources.

Supplemental_Information:

When the USACOE ICONS program was active, each of the 18 project areas was stand-alone and covered sites on the East, West , and Gulf coasts and Great Lakes. The numbering system was the same throughout this program, but was restarted for each set of cores (e.g. those from Long Island Sound had their own set of IDs). Therefore each area had a core no. 1 and the core IDs increased numerically with that area. Andrew Grosz (USGS), who used the cores for a heavy-mineral assessment, wanted a more national perspective so he had a new, continuous set of numbers assigned to the approximately 1500 cores that George Burbank at Hampton University split and described (USGSID). Because not all of the cores collected from an area as part of the ICONS program were used in the CERC Technical Reports, some cores do not have data in the CERCID (originally 81_1ID) field.

1. How should this data set be cited?

   DiGiacomo-Cohen(comp.), Mary, 20020000, CERCNAV: Navigation Points for CERC Cores: U.S. Geological Survey, Woods Hole Field Center.

   Online Links:

   • <http://woodshole.er.usgs.gov/openfile/of02-002/data/cores/cerc/>

   This is part of the following larger work.

   Poppe(comp.), Larry, and Paskevich(comp.), Valerie, 2002, Geological Framework Data from Long Island Sound, 1981-1990: a digital data release: U.S. Geological Survey Open-File Report 02-002, U. S. Geological Survey, Coastal and Marine Geology Program, Woods Hole, MA.

   Online Links:

   • <http://woodshole.er.usgs.gov/openfile/of02-002>

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -73.747002

   East_Bounding_Coordinate: -71.575302

   North_Bounding_Coordinate: 41.316750

   South_Bounding_Coordinate: 40.880329

3. What does it look like?

   ../../../htmldocs/images/browse/cercnav.gif (GIF)

   location of CERC cores shown in relationship to Long Island Sound area

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

   Calendar_Date: 1981

   Currentness_Reference: publication date

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

   Geospatial_Data_Presentation_Form: vector 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 (97)

   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?

   cercnav

   shapefile attribute table (Source: ESRI)

   FID

   Internal feature number. (Source: ESRI)

   Frequency of measurement: None planned

   Sequential unique whole numbers that are automatically generated.

   Range of values
   Units:	none
   Resolution:	Not applicable

   Shape

   Feature geometry. (Source: ESRI)

   Value	Definition
   Point	Coordinates defining the features.

   Coordinates defining the features.

   CRUISEID

   Name given to cruise during which the cores were collected. (Source: assigned)

   Frequency of measurement: None planned

   Value	Definition
   CERC	US Army Corps of Engineers Coastal Engineering Research Center (CERC)

   Range of values
   Units:	none
   Resolution:	Not applicable

   LON

   Longitude in decimal degrees of the core location as plotted (Source: compiler)

   Frequency of measurement: As needed

   Range of values
   Minimum:	-71.575302
   Maximum:	-73.747002
   Units:	Decimal degrees
   Resolution:	0.000001

   LAT

   Latitude in decimal degrees of the core location as plotted (Source: compiler)

   Frequency of measurement: As needed

   Range of values
   Minimum:	40.880329
   Maximum:	41.316750
   Units:	decimal degrees
   Resolution:	0.000001

   USGSID

   Core number assigned by the USGS (Andrew Grosz) (Source: USGS)

   Frequency of measurement: As needed

   Range of values
   Minimum:	382
   Maximum:	1298
   Units:	integers
   Resolution:	1

   CERCID

   Numbers assigned to cores in CERC Technical Paper 81_3 (Williams, 1981). When the USACOE ICONS program was active, each of the 18 project areas was stand-alone and covered sites on the East, West , and Gulf coasts and Great Lakes. The numbering system was the same throughout this program, but was restarted for each set of cores (e.g. those from Long Island Sound had their own set of IDs). Therefore each area had a core no. 1 and the core IDs increased numerically with that area. Andrew Grosz (USGS), who used the cores for a heavy-mineral assessment, wanted a more national perspective so he had a new, continuous set of numbers assigned to the approximately 1500 cores that George Burbank at Hampton University split and described. Because not all of the cores collected from an area as part of the ICONS program were used in the CERC Technical Reports, some cores do not have data in the CERCID field. (Source: Jeff Williams)

   Frequency of measurement: As needed

   Range of values
   Minimum:	1
   Maximum:	78
   Units:	integers and letters
   Resolution:	n/a

   DATE

   Year core was collected. (Source: compiler)

   Value	Definition
   1967	calendar year

   Entity_and_Attribute_Overview:

   This datalayer (navigation of the CERC cores from LIS) provides information location of vibracores used to interpret the geologic framework and sand resources.

   Entity_and_Attribute_Detail_Citation:

   Geological Framework Data from Long Island Sound, 1981-1990: a digital release

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Mary DiGiacomo-Cohen(comp.)

2. Who also contributed to the data set?

   Jeff Williams the original USACOE project chief; and Mary DiGiacomo-Cohen and Valerie Paskevich for completing the Arc processing and creation of the GIS data layer.

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

   U. S. Geological Survey
   c/o Larry Poppe
   Geologist
   384 Woods Hole Road
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2314 (voice)
   (508) 457-2310 (FAX)
   lpoppe@usgs.gov
   

   Hours_of_Service: 0800-1600

The purpose is to disseminate a digital version of a regional map showing the distribution of vibracores collected in Long Island Sound as part of the ICONS program of the USACOE. These cores can be used to provide useful information about the framework geology in this region.

1. From what previous works were the data drawn?

   CERC core locations (source 1 of 1)

   various(comp.), Unknown, CERC / ICONS coring cruise unpublished data.

   Type_of_Source_Media: Vibra corer cruise mylar navigation plot

   Source_Scale_Denominator: 80,000

   Source_Contribution:

   Vibra cores were collected as part of the USACOE's ICONS program. This dataset contains the locations of those cores collected in Long Island Sound.

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

   Date: 1991 (process 1 of 4)

   80,000 scale mylar plots of the core locations (either provided by, or based upon the original navigation system plots) were registered and digitized (using a Calcomp 9100 table and PC Arc/Info) to create point coverages with CT state plane coordinates. Attributes (COREID and 81_1ID) for coreids were added.

   Person who carried out this activity:
   

   Connecticut DEP
   c/o Mary DiGiacomo-Cohen
   Long Island Sound Resource Center
   UCONN Avery Point
   1080 Shennecossett Road
   Groton, CT 06340
   USA
   

   (860) 405-9015 (voice)
   lisrc@uconnvm.uconn.edu
   

   Data sources used in this process:

   • LIS CERC core location mylar plots

   Data sources produced in this process:

   • CERC core location coverage

   Date: 2001 (process 2 of 4)

   The navigation coverage was projected to Latitude/Longitude using Arc/Info. Decimal degree coordinates were ungenerated and joined to the attribute table. Some attribute data (IDs corresponding to the Williams (1981) were added. A shapefile was generated using ArcView.

   Person who carried out this activity:
   

   Connecticut DEP
   c/o Mary DiGiacomo-Cohen
   Long Island Sound Recource Center
   UCONN Avery Point
   1080 Shennecossett Road
   Groton, CT 06340
   USA
   

   (860)405-9015 (voice)
   lisrc@uconnvm.uconn.edu
   

   Data sources used in this process:

   • CERC core location coverage

   Data sources produced in this process:

   • CERC shapefiles

   Date: 08-Feb-2002 (process 3 of 4)

   Additional IDs (corresponding to the Williams (1981)) were added.

   Person who carried out this activity:
   

   Valerie Paskevich
   U.S. Geological Survey
   Computer Specialist
   384 Woods Hole Road
   Woods Hole, MA 02543-1598
   

   (508) 548-8700 x2281 (voice)
   (508) 457-2310 (FAX)
   vpaskevich@usgs.gov
   

   Data sources used in this process:

   • CERC shapefiles

   Data sources produced in this process:

   • cercnav.dbf
   • cercnav.shp
   • cercnav.shx
   • cercnav.sbx
   • cercnav.sbn

   Date: 01-Apr-2002 (process 4 of 4)

   The original field names, 81_1ID (Z1_1ID) and COREID were changed to field names CERCID and USGSID to be more descriptive.

   Person who carried out this activity:
   

   Valerie Paskevich
   U.S. Geological Survey
   Computer Specialist
   384 Woods Hole Road
   Woods Hole, MA 02543
   USA
   

   (508) 548-8700 x2281 (voice)
   (508) 457-2310 (FAX)
   vpaskevich@usgs.gov
   

   Data sources used in this process:

   • cercnav.dbf

   Data sources produced in this process:

   • cercnav.dbf

1. How well have the observations been checked?

   All attribute data were entered and checked by the compilers in a consistent manner.

2. How accurate are the geographic locations?

   80,000 scale.

3. How accurate are the heights or depths?

   Tides are less than 2 m

4. Where are the gaps in the data? What is missing?

   Core locations are provided for 96 cores with unique core ids (USGS assigned), 73 of these cores have ID's that correspond to the Williams (1981) technical paper. Core descriptions are not available for every core location.

5. How consistent are the relationships among the observations, including topology?

   No additional checks for topological consistency were performed on this data set.

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

Access_Constraints: None

Use_Constraints:

The U.S. Geological Survey and the U.S. Army Corps of Engineers must be referenced as the originator of the dataset in any future products or research derived from these data.

Although this derived data set and its lineage dataset have been used by the USGS and Connecticut DEP, no warranty, expressed or implied, is made by the USGS or CT DEP 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 or CT DEP in the use of these data or related materials.

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

   U. S. Geological Survey
   c/o Larry Poppe
   Geologist
   384 Woods Hole Road
   Woods Hole, MA 02543-1598
   USA
   

   (508)548-8700 x2314 (voice)
   (508) 457-2310 (FAX)
   lpoppe@usgs.gov
   

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

   Long Island Sound: cerc.shp

3. What legal disclaimers am I supposed to read?

   Although this derived data set and its lineage dataset have been used by the USGS and Connecticut DEP, no warranty, expressed or implied, is made by the USGS or the CT DEP 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 or CT DEP in the use of these data or related materials.

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

     Data format:	The seven ArcView shapefiles (cercnav.dbf, cercnav.shp, cercnav.shx, cercnav.sbn, cercnav.sbx, cercnav.avl and cercnav.prj) comprising the navigation data for the USACOE vibracores collected in Long Island Sound and an ASCII text version of the metadata file. in format ArcView shapefile Size: 11Kbyte
     Network links:	<http://woodshole.er.usgs.gov/openfile/of02-002/data/cores/cerc/>

   • Cost to order the data: none

5. Is there some other way to get the data?

   None

6. What hardware or software do I need in order to use the data set?

   The navigation overlay for the CERC cores is available in an ArcView shapefile format. The user must have ESRI's ArcView 3.0 or greater software to read and process the data file. In lieu of Arcview, the user may utilize another GIS application package capable of importing the data.

Dates:

Last modified: 02-Apr-2002

Metadata author:

Valerie Paskevich
U. S. Geological Survey
Computer Specialist
384 Woods Hole Road
Woods Hole, MA 02543-1598
USA

(508) 548-8700 x2281 (voice)
(508) 457-2310 (FAX)
vpaskevich@usgs.gov

Metadata standard:

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