Extended Tracklines of Continues Resistivity Profile Data collected in 2005 in the Neuse River, North Carolina

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: VeeAnn A. Cross

Publication_Date: 2005

Title:

Extended Tracklines of Continues Resistivity Profile Data collected in 2005 in the Neuse River, North Carolina

Geospatial_Data_Presentation_Form: vector digital data

Online_Linkage:

<http://pubs.usgs.gov/of/2005/1306/data/navigation/extendedlines_05.zip>

Larger_Work_Citation:

Citation_Information:

Originator: VeeAnn A. Cross

Originator: John F. Bratton

Originator: Emile Bergeron

Originator: Jeff K. Meunier

Originator: John Crusius

Originator: Dirk Koopmans

Publication_Date: 2005

Title:

Continuous Resistivity Profiling Data from the Upper Neuse River Estuary, North Carolina, 2004-2005

Series_Information:

Series_Name: Open-File Report

Issue_Identification: 2005-1306

Publication_Information:

Publication_Place: Woods Hole Science Center, Woods Hole, MA

Publisher: U.S. Geological Survey, Coastal and Marine Geology Program

Online_Linkage: <http://pubs.usgs.gov/of/2005/1306>

Description:

Abstract:

The Neuse River Estuary in North Carolina is a broad, V-shaped water body located on the southwestern end of Pamlico Sound. This estuary suffers from severe eutrophication for which several water quality models have recently been developed to aid in the management of nutrient loading to the estuary. In an effort to help constrain model estimates of the fraction of nutrients delivered by direct ground-water discharge, continuous resistivity profile (CRP) measurements were made during the spring of 2004 and 2005. CRP is used to measure electrical resistivity of sediments, a property that is sensitive to difference in salinity of submarine ground water. The 2004 and 2005 surveys used floating resistivity streamers of 100 m and 50 m respectively. The depth penetration of the streamers is approximately 20% of the streamer length which translates to approximately 20-25 m with the 100 m streamer and 12-14 m with the 50 m streamer. These data were processed using AGI's EarthImager 2D software. CRP data enables the mapping of the extent and depth of the fresher ground water within the estuary.

Purpose:

To provide extended tracklines for the lines where the resistivity streamer was towed from shore.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20050504

Ending_Date: 20050505

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -76.980495

East_Bounding_Coordinate: -76.840531

North_Bounding_Coordinate: 35.019317

South_Bounding_Coordinate: 34.937251

Keywords:

Theme:

Theme_Keyword_Thesaurus: General

Theme_Keyword: CMGP

Theme_Keyword: Coastal and Marine Geology Program

Theme_Keyword: Continuous Resistivity Profiling

Theme_Keyword: marine resistivity

Theme_Keyword: navigation

Theme_Keyword: Open-File Report

Theme_Keyword: polyline

Theme_Keyword: U.S. Geological Survey

Theme_Keyword: USGS

Theme_Keyword: Woods Hole Science Center

Theme_Keyword: trackline

Theme_Keyword: OF 2005-1306

Theme_Keyword: CRP

Theme_Keyword: shapefile

Place:

Place_Keyword_Thesaurus: General

Place_Keyword: Neuse River

Place_Keyword: North America

Place_Keyword: North Carolina

Place_Keyword: Pamlico Sound

Place_Keyword: United States

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.

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535

Data_Quality_Information:

Lineage:

Source_Information:

Source_Contribution:

These data were acquired with an AGI SuperSting Marine system that is described at the website: www.agiusa.com/marinesystem.shtml. The particular system used for this acquisition was an 11 electrode array with electrodes spaced 5 meters apart. The potential electrodes are made of graphite, with the remaining electrodes stainless steel. A dipole-dipole configuration was used for the data collection in which two fixed current electrodes are assigned with the measurement of voltage potentials between electrode pairs in the remaining electrodes. Each line of data acquisition records several files. The two files necessary for processing are the *.stg and *.gps file. The STG file contains the resistivity data, while the GPS file contains the navigation information.

Several tracklines were initiated with the resistivity streamer onshore and pulled away perpendicular to the beach. Because the streamer is behind the boat, any resistivity values acquired prior to crossing the boat's initial position are recorded as negative distances along line. In order to geographically place these readings, the tracklines needed to be extended shoreward.

Process_Step:

Process_Description:

Four tracklines were started with the streamer on the shore. These were lines 3, 4, 5, and 9. I extracted the individual tracklines from the composite polyline shapefile.

Source_Used_Citation_Abbreviation: restracklines_05.shp

Source_Produced_Citation_Abbreviation: l3f1_4extend.shp

Source_Produced_Citation_Abbreviation: l4f1_4extend.shp

Source_Produced_Citation_Abbreviation: l5f1_4extend.shp

Source_Produced_Citation_Abbreviation: l9f1_4extend.shp

Process_Step:

Process_Description:

A sample avenue script was downloaded from ESRI's Knowledge base and was modified so that a shapefile polyline could be extended by a user entered amount. The direction of the extension was from the beginning of the line in a direction consistent with the angle of the beginning of the line. The length of the extension was determined from the processed resistivity data in which all the data were included. The first negative value in the resulting XYZ file was used as the length of the extension (entered as a positive value).

Process_Step:

Process_Description:

The geoprocessing extension in ArcView 3.3 was used to merge the individual shapefiles into a single shapefile.

Source_Produced_Citation_Abbreviation: extendedlines_05.shp

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: String

Point_and_Vector_Object_Count: 4

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.000000

Longitude_Resolution: 0.000000

Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257222

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: extendedlines_05

Attribute:

Attribute_Label: FID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: ID

Attribute_Definition: Unique number identifying each polyline.

Attribute_Definition_Source: Computer generated.

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1

Range_Domain_Maximum: 9

Attribute:

Attribute_Label: LINENAME

Attribute_Definition:

String representing the prefix of the original resistivity line name.

Attribute_Definition_Source: Data processor.

Attribute_Domain_Values:

Unrepresentable_Domain: character set

Attribute:

Attribute_Label: COL_TIME

Attribute_Definition: The time at which data collection began, UTC time.

Attribute_Definition_Source: Software.

Attribute_Domain_Values:

Unrepresentable_Domain: time in hr:min:sec

Attribute:

Attribute_Label: COL_DATE

Attribute_Definition: Date of data acquisition.

Attribute_Definition_Source: Software.

Attribute_Domain_Values:

Unrepresentable_Domain: date in the format of DDMMYR

Attribute:

Attribute_Label: EXTENDED

Attribute_Definition: The distance in meters that the line was extended.

Attribute_Definition_Source: Data processor.

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 21.7

Range_Domain_Maximum: 32.5

Attribute_Units_of_Measure: meters

Distribution_Information:

Resource_Description: Downloadable Data

Distribution_Liability:

These data were prepared by an agency of the United States Government. Neither the United States government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States government or any agency thereof. Although all data published in this report have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and/or the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data, software, or related materials.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Transfer_Size: 0.015

Metadata_Reference_Information:

Metadata_Date: 20051101

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

REQUIRED: The organization responsible for the metadata information.

Contact_Person: REQUIRED: The person responsible for the metadata information.

Contact_Address:

Address_Type:

REQUIRED: The mailing and/or physical address for the organization or individual.

City: REQUIRED: The city of the address.

State_or_Province: REQUIRED: The state or province of the address.

Postal_Code: REQUIRED: The ZIP or other postal code of the address.

Contact_Voice_Telephone:

REQUIRED: The telephone number by which individuals can speak to the organization or individual.

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile