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