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

81_2NAVP: 5 minute Navigation fixes for cruise R/V ASTERIAS 81-2

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:

81_2NAVP: 5 minute Navigation fixes for cruise R/V ASTERIAS 81-2

Abstract:

This GIS layer contains the shiptrack navigation collected aboard the RV ASTERIAS during a 1981 geophysical cruise to Block Island Sound and easternmost Long Island Sound.

1. How should this data set be cited?

   Paskevich, Valerie and Poppe, Larry, 2002, 81_2NAVP: 5 minute Navigation fixes for cruise R/V ASTERIAS 81-2: U.S. Geological Survey, Woods Hole Field Center.

   Online Links:

   • <http://woodshole.er.usgs.gov/openfile/of02-002/data/nav/81_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, Woods Hole, MA.

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -72.193500

   East_Bounding_Coordinate: -71.493170

   North_Bounding_Coordinate: 41.348500

   South_Bounding_Coordinate: 41.067000

3. What does it look like?

   ../../../../htmldocs/images/browse/81_2navp.gif (GIF)

   R/V ASTERIAS cruise 81-2 extent of shapefile containing the navigation positional fixes shown in its spatial reference to Long Island Sound.

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

   Beginning_Date: 11-Sep-1981

   Ending_Date: 18-Sep-1981

   Currentness_Reference: ground condition

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 (901)

   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?

   81_2navp

   shapefile attribute table (Source: ESRI)

   FID

   Internal feature number. (Source: ESRI)

   Range of values

   Sequential unique whole numbers that are automatically generated.

   Shape

   Feature geometry. (Source: ESRI)

   Value	Definition
   Point	ESRI point shapefile

   Coordinates defining the features.

   CRUISEID

   Identifier given to cruise during which the navigation data were collected. (Source: USGS)

   Value	Definition
   AST81-2	Identifier assigned for cruise R/V ASTERIAS 81-2

   DATE

   Date which the navigation data was collected. Values are recorded as an ASCII string. (Source: Chief Scientist)

   Frequency of measurement: As needed

   Value	Definition
   09/11/81	day/month/year
   09/12/81	day/month/year
   09/13/81	day/month/year
   09/14/81	day/month/year
   09/15/81	day/month/year
   09/16/81	day/month/year
   09/17/81	day/month/year
   09/18/81	day/month/year

   TIME

   Time of navigation fix recorded as hhmm (Source: Recorded by Loran-C navigation system and noted in cruise log book.)

   Frequency of measurement: As needed

   Value	Definition
   hhmm	Hour and minutes

   Range of values
   Units:	Time in hours and minutes in military time
   Resolution:	Hours and minutes

   LINE

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

   Frequency of measurement: As needed

   Range of values
   Minimum:	1
   Maximum:	31
   Units:	integer
   Resolution:	1

   Range of values
   Units:	Time in hours and minutes in military time
   Resolution:	Hours and minutes

   LATITUDE

   Latitude coordinate position of navigation fix recorded as signed decimal degrees. (Source: Northstar 6000 Loran-C receiver)

   Range of values
   Minimum:	41.06700
   Maximum:	41.34850
   Units:	Decimal degrees
   Resolution:	0.00001

   LONGITUDE

   Longitude coordinate position of navigation fix recorded as signed decimal degrees. (Source: Northstar 6000 Loran-C receiver)

   Range of values
   Minimum:	-72.19350
   Maximum:	-71.49317
   Units:	Decimal degrees
   Resolution:	0.00001

   COMMENTS

   Navigation notes made to positional fixes on Loran-C printout. Example of notes include Start of Line (SOL), End of Line (EOL) and navigation course changes. (Source: AST81-2 Loran-C navigation printout)

   Frequency of measurement: As needed

   Entity_and_Attribute_Overview:

   This data layer (navigation collected onboard the R/V ASTERIAS cruise 81-2 to BIS and easternmost LIS) provides information 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; U.S. Geological Survey Open-File Report 02-002

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Valerie Paskevich(comp.)
   • Larry Poppe(comp.)

2. Who also contributed to the data set?

   Sally Needell and Ralph Lewis, the chief scientists aboard the cruise; 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
   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 Block Island Sound and easternmost Long Island Sound. 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?

   Asterias81-2 LORAN-C printouts (source 1 of 1)

   Needel, Sally W. , and Lewis, Ralph S. , 19840000, Geology of Block Island Sound, R.I. and N.Y.: U.S. Geological Survey Miscellaneous Field Studies Map MF-1621, U.S. Geological Survey, Woods Hole, MA.

   Type_of_Source_Media: paper

   Source_Contribution:

   During field work conducted in Block Island Sound during September 1981 high-resolution seismic-reflection and LORAN-C navigation data were collected. This data set is the 5-min. navigation from that cruise.

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

   Date: 15-Nov-2001 (process 1 of 3)

   Five-minute navigation from the original Northstar-6000 printouts generated onboard the Asterias were converted to decimal degrees and entered into a digital file.

   Person who carried out this activity:
   

   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
   

   Data sources used in this process:

   • Asterias 81-2 LORAN-C printouts

   Data sources produced in this process:

   • a81_2nav.txt

   Date: 17-Dec-2001 (process 2 of 3)

   The text file containing the R/V ASTERIAS 81-2 navigation data were imported into ArcView and converted to a point theme shapefile.

   Person who carried out this activity:
   

   U.S. Geological Survey
   c/o Valerie Paskevich
   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:

   • a81_2nav.txt

   Data sources produced in this process:

   • 81_2navp.dbf
   • 81_2navp.shp
   • 81_2navp.shx

   Date: 19-Jan-2002 (process 3 of 3)

   The ArcView shapefile was plotted. Navigation fixes that were identified as bad due to Loran-C jumps or inaccuracies in recording were deleted from the data set

   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:

   • 81_2navp.shp
   • 81_2navp.dbf

   Data sources produced in this process:

   • 81_2navp.shp
   • 81_2navp.dbf

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?

   All navigation was done by Loran C. Typical Loran accuracy for Long Island Sound is about 100 m.

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. Navigation points are spaced at 5 minute intervals (approx) and at course changes or line events (start/end of line). Continuous 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: 81_2navp.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 (81_2navp.dbf, 81_2navp.shp, 81_2navp.shx, 81_2navp.avl, 81_2navp.sbn, 81_2navp.sbx, 81_2navp.prj) comprising the navigation fixes (point data) for the ASTERIAS 81-2 cruise in Block Island Sound and easternmost Long Island Sound and an ASCII version of the data layer metadata file. in format ArcView shapefile (version 3.2) ESRI shapefile Size: 36 Kbytes
     Network links:	<http://woodshole.er.usgs.gov/openfile/of02-002/data/nav/81_2nav/81_2navp.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.

     Data format:	ASCII Comma delimited ASCII file with field header record. Size: 40.1 Kbytes
     Network links:	<http://woodshole.er.usgs.gov/openfile/of02-002/data/nav/81_2nav/a81_2nav.txt>
     Media you can order:	DVD (Density 4.75 Gigabytes) (format UDF) Note: he 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.

   • 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 81_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: 18-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)