Processed Continuous Resistivity Profiles Collected in the Neuse River, May 4, 2005

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: John F. Bratton
Originator: VeeAnn A. Cross
Publication_Date: 2005
Title:
Processed Continuous Resistivity Profiles Collected in the Neuse River, May 4, 2005
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2005-1306
Publication_Information:
Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
Online_Linkage: https://doi.org/10.3133/ofr20051306
Online_Linkage: 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: Reston, VA
Publisher: U.S. Geological Survey
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 resistivity data as collected by the AGI SuperSting system and processed with EarthImager software.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20050504
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -77.020917
East_Bounding_Coordinate: -76.812000
North_Bounding_Coordinate: 35.102200
South_Bounding_Coordinate: 34.936783
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:d20c7922-e514-4560-bcb1-4518766ad270
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: CMGP
Theme_Keyword: coastal
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: Continuous Resistivity Profiling
Theme_Keyword: CRP
Theme_Keyword: ground-water
Theme_Keyword: marine resistivity
Theme_Keyword: submarine ground-water
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Woods Hole Science Center
Theme_Keyword: Open-File Report
Theme_Keyword: OF 2005-1306
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: continuous resistivity profiling
Theme_Keyword: image collections
Place:
Place_Keyword_Thesaurus: None
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.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: John F. Bratton
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: (508) 548-8700 x2254
Contact_Facsimile_Telephone: (508) 457-2310
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535
Data_Quality_Information:
Logical_Consistency_Report: Information unavailable from original metadata.
Completeness_Report: Information unavailable from original metadata.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: Unpublished material
Title: Raw CRP Data
Type_of_Source_Media: hard disk
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20050504
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: raw crp data
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.
Process_Step:
Process_Description:
The data were transferred from the logging computer via AGISSAdmin software. The data files available for this day are L2F1.*, L3F1.*, L4F1.*, and L5F1.*.
Process_Date: Unknown
Process_Step:
Process_Description:
When the data were acquired, a scaling factor of 5 was used. However, because the initialization file already defined the electrodes as being 5 meters apart, this had the affect of indicating the electrodes were 25 meters apart. Therefore, Marine Log Manager was used to rescale the STG file, by using a scale factor of 0.2, to return the electrodes to the appropriate spacing.
Source_Used_Citation_Abbreviation: L1F1.stg
Process_Date: Unknown
Source_Produced_Citation_Abbreviation: L1F1_rescaled.stg
Process_Step:
Process_Description:
The data were merged with navigation and linearized using AGI's Marine Log Manager software.
Process_Date: Unknown
Process_Step:
Process_Description:
In most cases, only that portion of the linearized file that had positive distance along values was exported to the new STG file. In the case of L3F1, L4F1, and L5F1, the entire file was selected for export. These lines were run perpendicular to shore, starting at the shore. Exporting the whole line was necessary to get the nearshore values. Because of the length of one of the files, as well as incorporated turns, L2F1 is broken up and exported to 4 new STG files, and accompanying DEP files. The DEP file contains the distance along line and bathymetry values.
Process_Date: Unknown
Process_Step:
Process_Description:
The DEP files were checked for anomalous bathymetry values, and those lines within the DEP file were deleted. For L3F1, L4F1, and L5F1, the file that was exported in its entirety (which included negative distances along line), had a depth value of 0.1 assigned to the first point in the DEP file. In addition, the first distance along point in the DEP file was modified to be the same as the first point in the XYZ output of a test processing. This was done to ensure that the entire inversion had a water column constraint.
Source_Used_Citation_Abbreviation:
L2F1_part1proc.dep, L2F1_part2proc.dep, L2F1_part3proc.dep, L2F1_part4proc.dep
Process_Date: Unknown
Source_Produced_Citation_Abbreviation:
L2F1_part1proc_mod.dep, L2F1_part2proc_mod.dep, L2F1_part3proc_mod.dep, L2F1_part4proc_mod.dep
Process_Step:
Process_Description:
EarthImager software does not require that a default resistivity value for the water column be supplied in the DEP file. If one is not supplied, then it calculates a value based on the first electrode pair. For this reason, the data were processed without a value supplied (in the folder def_wres), and with a value supplied (in the folder wres). The average water resistivity value was calculated based on YSI temperature and salinity data readings recorded during the survey. The average temperature and average salinity values over the STG survey area were plugged into a JavaScript calculator to determine conductivity. The website (http://ioc.unesco.org/oceanteacher/resourcekit/M3/Converters/SeaWaterEquationOfState/Sea%20Water%20Equation%20of%20State%20Calculator.htm) was used for this purpose. The inverse of the conductivity value was then used as the average resistivity value.
Process_Date: Unknown
Process_Step:
Process_Description:
EarthImager version 1.9.0 was used to process the data files. The *.ini file accompanying the results contains the parameters used during the processing. These parameters include: minimum voltage: 0.02 minimum abs(V/I): 2E-5 max repeat error: 3% min apparent res: 0.03 max apparent res: 1000 max reciprocal error: 5% remove spikes smooth model inversion finite difference method Cholesky decomposition Dirichlet boundary condition thickness incremental factor: 1.1 depth factor: 1.1 number of iterations: 8 stop criteria: max RMS 3%, error reduction 5%, L2Norm CRP processing using a 65% overlap
Process_Date: Unknown
Process_Step:
Process_Description:
The results of the processing are a JPEG image of the resistivity profile, and an XYZ file containing the distance along, depth, apparent resistivity (ohm-m). The first pass at processing (Trial1) used the default water resistivity value, while the second pass (Trial2) used the average water resistivity value in the DEP file. The JPEG file produced uses a color scale that is based on the data from this particular file.
Process_Date: Unknown
Process_Step:
Process_Description:
The XYZ output file was then loaded into Matlab, along with the depth information, to create a new JPEG image with the same color scale for all the data files. In this manner, the JPEG images can be compared directly. Care was taken to try to get the vertical and horizontal scales uniform as well, although this was not always possible due to Matlab limitations. These images reside in the Matlab images folder. Part of the filename (defwres vs wres), as well as information within the image indicates if the default water resistivity (defwres) data file was used or an average water resistivity (wres) value.
Process_Date: Unknown
Process_Step:
Process_Description:
Edits to the metadata were made to fix any errors that MP v 2.9.34 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). The source information was incomplete and had to be modified to meet the standard. The process steps without process dates had the date set to unknown. The distributor information needed to be added, along with the distribution format and network resource. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent.
Process_Date: 20161031
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description: USGS Thesaurus keywords added to the keyword section.
Process_Date: 20180720
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description: Crossref DOI link was added as the first link in the metadata.
Process_Date: 20191118
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description:
Added keywords section with USGS persistent identifier as theme keyword.
Process_Date: 20200908
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
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:
Format_Name: TEXT
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Digital_Form:
Digital_Transfer_Information:
Format_Name: JPEG
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Fees: none
Metadata_Reference_Information:
Metadata_Date: 20240318
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: VeeAnn A. Cross
Contact_Organization: U.S. Geological Survey
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: (508) 548-8700 x2251
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: whsc_data_contact@usgs.gov
Contact_Instructions:
The metadata contact email address is a generic address in the event the person is no longer with USGS. (updated on 20240318)
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time

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