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

83_2NAVT: Navigation Lines for R/V ASTERIAS 83-2 (AST83-2)

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: 83_2NAVT: Navigation Lines for R/V ASTERIAS 83-2 (AST83-2)

Abstract:

This GIS layer contains the shiptrack navigation lines collected aboard the RV ASTERIAS during a 1983 geophysical cruise to east-central Long Island Sound. A boomer seismic system was used to collect the subbottom data.

1. How should this data set be cited?

   DiGiacomo-Cohen(comp.), Mary, 2002, 83_2NAVT: Navigation Lines for R/V ASTERIAS 83-2 (AST83-2): U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole, MA.

   Online Links:

   • <http://woodshole.er.usgs.gov/openfile/of02-002/data/nav/83_2nav>

   This is part of the following larger work.

   Poppe, Larry, and Paskevich, 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, 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: -72.950035

   East_Bounding_Coordinate: -72.560265

   North_Bounding_Coordinate: 41.245796

   South_Bounding_Coordinate: 40.972534

3. What does it look like?

   ../../../../htmldocs/images/browse/83_2navt.gif (GIF)

   Extent of AST83-2 navigation tracklines displayed in relationship to Long Island Sound.

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

   Beginning_Date: 25-May-1983

   Ending_Date: 03-Jun-1983

   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):

      • String (36)

   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 0.00001. Longitudes are given to the nearest 0.00001. 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?

   83_2navt

   shapefile attribute table (Source: ESRI)

   FID

   Internal feature number. (Source: ESRI)

   Sequential unique whole numbers that are automatically generated.

   Range of values
   Units:	Integer
   Resolution:	1

   Shape

   Feature geometry. (Source: ESRI)

   Value	Definition
   PolyLine	ESRI shapefile polyline
   PolyLine	ESRI shapefile polyline

   Coordinates defining the features.

   LENGTH

   length of line in native units (Source: software generated)

   Range of values
   Minimum:	0.016
   Maximum:	.387
   Units:	Decimal degrees
   Resolution:	0.001 degrees

   CRUISEID

   Identifier assigned to cruise for which the navigation data were collected. (Source: assigned)

   Value	Definition
   AST83-2	Identifier assigned to cruise

   DATE

   Date during which the navigation data was collected. (Source: Chief Scientist)

   Value	Definition
   MONTH/DAY/YEAR	Months, Days, and Years

   Range of values
   Units:	Months, Days, and Years
   Resolution:	Months, Days, and Years

   LINE

   Number assigned to the seismic line for which the navigation was collected (Source: Chief Scientist)

   Range of values
   Minimum:	1
   Maximum:	25
   Units:	lines

   IMAGE

   Name and relative path of associated GIF image containing browse version of seismic record for line. (Source: assigned file name)

   Relative directory path and GIF file name

   Entity_and_Attribute_Overview:

   This data layer (navigation collected onboard the R/V ASTERIAS cruise 83-2 to east-central LIS) provides information about the location of seismic data used to interpret the geologic framework.

   Entity_and_Attribute_Detail_Citation:

   Geological Framework data from Long Island Sound, 1981-1990: A Digital Data 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?

   Ralph Lewis and Sally Needell, the chief scientists aboard the cruise; 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 sub-bottom seismic profiles (boomer) collected in east-central Long Island Sound aboard the R/V ASTERIAS during 1983. The seismic data collected along these ship tracks can be used to provide useful information about the framework geology in this region.

1. From what previous works were the data drawn?

   ASTERIAS 83-2 navigation logs (source 1 of 1)

   Needell, Sally W. , Lewis, Ralph S. , and Colman, Steven M. , 19870000, Maps showing the Quaternary geology of east-central Long Island Sound: U.S. Geological Survey Miscellaneous Field Studies Map MF-1939-B, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Field Center, Woods Hole, MA.

   This is part of the following larger work.

   Lewis, Ralph S. , and DiGiacomo-Cohen, Mary, 2000, A review of the Geological Framework of the Long Island Sound basin, with some observations relating to postglacial sedimentation: Journal of Coastal Research vol. 16, no. 3, Coastal Education and Research Foundation, Fort Lauderdale, FL.

   Type_of_Source_Media:

   High-resolution seismic-reflection boomer lines navigated with Loran C

   Source_Scale_Denominator: 80,000

   Source_Contribution:

   High-resolution seismic-reflection data were collected during field work conducted in east-central Long Island Sound during 1983. This data set is the navigation from that cruise.

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

   Date: 1990 (process 1 of 4)

   Selected navigation points from the original onboard logs were hand plotted on charts with Loran overlays. These overlays were then registered and digitized (using a Calcomp 9100 table and PC Arc/Info) to create point coverages with CT state plane coordinates. Ungenerated point coordinates were used to generate a line coverage. Lines were edited where necessary (split at start/end) and attributes 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:

   • ASTERIAS 83_2 navigation logs

   Data sources produced in this process:

   • Ast83_2 navigation coverages

   Date: 2001 (process 2 of 4)

   The navigation coverage was projected to Latitude/Longitude using Arc/Info, and a shapefile was generated using ArcView.

   Person who carried out this activity:
   

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

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

   Data sources used in this process:

   • Ast83_2 navigation coverages

   Data sources produced in this process:

   • Ast83_2 navigation shapefiles

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

   Navigation shape files were modified to remove the Arc/Info specific attributes and add the attribute field IMAGE. This field is used to store the relative path to the browse image of the associated seismic record for the line segment.

   Person who carried out this activity:
   

   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
   

   Data sources used in this process:

   • Ast83_2 navigation shapefiles

   Data sources produced in this process:

   • Ast83_2 navigation shapefiles

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

   The a83_2l shapefile name was changed to be more descriptive within the USGS Open-File Report 02-002.

   Person who carried out this activity:
   

   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
   

   Data sources used in this process:

   • Ast83_2 navigation shapefiles

   Data sources produced in this process:

   • 83_2navt.dbf
   • 83_2navt.shp
   • 83_2navt.shx
   • 83_2navt.sbn
   • 83_2navt.sbx

1. How well have the observations been checked?

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

2. How accurate are the geographic locations?

   +/- 100 m Typical positioning accuracy of Loran C

3. How accurate are the heights or depths?

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

   Complete information is provided for all navigation lines in the data set; lines are generated from navigation points spaced at 5 minute intervals (approx) and at course changes or line events (start/end). Continous navigation is not available.

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 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, 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.

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: 83_2navt.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, 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:	The seven ArcView shapefiles (83_2navt.dbf, 83_2navt.shp, 83_2navt.shx, 83_2navt.avl, 83_2navt.sbn, 83_2navt.sbx, 83_2navt.prj) comprising the navigation line data for the R/V ASTERIAS 83_2 cruise in east-central Long Island Sound and an ASCII version of the metadata file. in format ArcView (version 3.2) ESRI shapefiles Size: 13.7 Kbytes
     Network links:	<http://woodshole.er.usgs.gov/openfile/of02-002/data/nav/83_2nav/83_2navt.zip>
     Media you can order:	DVD (Density 4.7 Gbytes) (format UDF) Note: The user must have a system with a DVD drive capable of reading an UDF standard DVD-R disk. To browse the information contained on this disk, the user must also have a current version of WWW browser available. The user must also have the software installed on their computer system capable to unzip the archived file.

   • 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 Ast83_2 navigation overlay 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: 17-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)