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

90_1NAVP: 1 Minute Navigation Points for R/V ASTERIAS 90-1

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: 90_1NAVP: 1 Minute Navigation Points for R/V ASTERIAS 90-1

Abstract:

This GIS layer contains the shiptrack navigation points collected aboard the RV ASTERIAS during a 1990 geophysical cruise to Fishers Island Sound and eastern Long Island Sound. A boomer seismic system was used to collect the subbottom data.

1. How should this data set be cited?

   DiGiacomo-Cohen, Mary, 2002, 90_1NAVP: 1 Minute Navigation Points for R/V ASTERIAS 90-1: U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole, MA.

   Online Links:

   • <http://woodshole.er.usgs.gov/openfile/of2-002/data/nav/90_1nav/90_1navp.htm>

   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.

   Online Links:

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

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -72.183678

   East_Bounding_Coordinate: -71.855431

   North_Bounding_Coordinate: 41.329899

   South_Bounding_Coordinate: 41.208870

3. What does it look like?

   ../../../../htmldocs/images/browse/90_1navp.gif (GIF)

   Extent of R/V ASTERIAS cruise 90-1 navigation points shown in its spatial reference to Long Island Sound.

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

   Beginning_Date: 10-Sep-1990

   Ending_Date: 12-Sep-1990

   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 (1295)

   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 0.000001. Longitudes are given to the nearest 0.000001. 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?

   90_1navp

   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
   Point	ESRI point shapefile

   Coordinates defining the features.

   DATA6

   LORAN navigation coordinate collected during cruise (Source: US Coast Guard Loran-C radio navigation system)

   Range of values
   Minimum:	26019.450
   Maximum:	26191.019
   Units:	loran time difference in microseconds
   Resolution:	0.001

   DATA8

   LORAN navigation coordinate collected during cruise (Source: US Coast Guard Loran-C radio navigation system)

   Range of values
   Minimum:	43947.195
   Maximum:	43992.712
   Units:	loran time difference in microseconds
   Resolution:	0.001

   LINE

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

   Frequency of measurement: As needed

   Range of values
   Minimum:	0
   Maximum:	28
   Units:	integer
   Resolution:	1

   HRMIN

   Local time at which the navigation was collected. (Source: Cheif Scientists)

   Value	Definition
   hours and minutes	hours and minutes in military time

   Range of values
   Units:	Hours and minutes
   Resolution:	minutes

   CRUISEID

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

   Value	Definition
   AST90-1	Assigned identifier for cruise R/V ASTERIAS 90-1

   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

   PLON

   Longitude in decimal degrees of the navigation point. (Source: Chief Scientist)

   Range of values
   Minimum:	-072.183678
   Maximum:	-071.855431
   Units:	Decimal degrees
   Resolution:	0.00001

   PLAT

   Latitude in decimal degrees of the navigation point. (Source: Chief Scientist)

   Range of values
   Minimum:	41.208870
   Maximum:	41.329899
   Units:	Decimal degrees
   Resolution:	0.00001

   TIME

   Local time at which navigation was collected (Source: Chief Scientist)

   Value	Definition
   Hour:minute	Hour and minutes

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

   Entity_and_Attribute_Overview:

   This datalayer (navigation collected onboard the R/V ASTERIAS cruise 90-1 to Fishers Island Sound and eastern Long Island Sound) 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 release

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

2. Who also contributed to the data set?

   Ralph Lewis the chief scientist 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 Fishers Island Sound and eastern Long Island Sound aboard the R/V ASTERIAS during 1990. 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 90-1 navigation data files (source 1 of 1)

   Lewis, Ralph S. , Unknown, Unpublished data from ASTERIAS 90-1 geophysical cruise:.

   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_Contribution:

   High-resolution seismic-reflection data were collected during field work conducted in Fishers Island Sound and eastern Long Island Sound during 1990. This data set is the navigation from that cruise.

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

   Date: 1990 (process 1 of 4)

   Ten second navigation data was converted to an Info table and one record for every minute was selected from the set. These records were generated into an Arc coverage using the Lat/Long coordinates (provided by the LORAN C navigation system). The coverage was projected to CT state plane coordinates and compared to digital base maps. The entire set of points was moved (as a group) using ArcEdit to reflect the local variation in LORAN. 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 90-1 navigation data files

   Data sources produced in this process:

   • Ast90-1 navigation coverages

   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 as PLAT and PLON. The lat/lon coords from the original navigation system were deleted since they did not reflect the plotted position of the navigation points. 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:

   • Ast90-1 navigation coverages

   Data sources produced in this process:

   • Ast90-1 navigation shapefiles

   Date: 06-Apr-2002 (process 3 of 4)

   The a90_1p 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:

   • Ast90_1 navigation shapefiles

   Data sources produced in this process:

   • 90_1navp.dbf
   • 90_1navp.shp
   • 90_1navp.shx
   • 90_1navp.sbn
   • 90_1navp.sbx

   Date: 17-Apr-2002 (process 4 of 4)

   Navigation shapefiles were modified to delete the Arc/Info generated attribute fields.

   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:

   • 90_1navp.dbf

   Data sources produced in this process:

   • 90_1navp.dbf

1. How well have the observations been checked?

   All attribute data were recorded by the chief scientist or the onboard computer navigation system, it has been entered, processed 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 LIS 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 points in the data set. Navigation points are spaced at 1 minute intervals (approx) and at course changes or line events (start/end). Continuous navigation is not provided.

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: Ast90_1p.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 (90_1navp.dbf, 90_1navp.shp, 90_1navp.shx, 90_1navp.avl, 90_1navp.sbn, 90_1navp.sbx, 90_1navp.prj) comprising the navigation point data for the R/V ASTERIAS 90-1 cruise in Fishers Island Sound and eastern Long Island Sound and an ASCII copy of the metadata file. in format ArcView (version 3.2) ESRI point shapefile Size: 56.7 Kbytes
     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

   • Availability in digital form:

     Data format:	ASCII Comma delimited ASCII text file with field header record. Size: 59.0 Kbytes
     Media you can order:	CD-ROM (Density 4.75 Gigabytes) (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 AST90-1 point 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)