MRGAPR15_ALLXYZRES.SHP: Point shapefile of processed continuous resistivity profiling data below the sediment water interface collected in the Indian River Bay, Delaware, on April 15, 2010, on U.S. Geological Survey Field Activity 2010-006-FA (Geographic, WGS 84)

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: 2014

Title:

MRGAPR15_ALLXYZRES.SHP: Point shapefile of processed continuous resistivity profiling data below the sediment water interface collected in the Indian River Bay, Delaware, on April 15, 2010, on U.S. Geological Survey Field Activity 2010-006-FA (Geographic, WGS 84)

Edition: 1

Geospatial_Data_Presentation_Form: vector digital data

Series_Information:

Series_Name: Open-File Report

Issue_Identification: 2011-1039

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:

<http://pubs.usgs.gov/of/2011/1039/data/resistivity/shapefile/mrgapr15_allxyzres.zip>

Online_Linkage:

<http://pubs.usgs.gov/of/2011/1039/html/ofr2011-1039-catalog.html>

Larger_Work_Citation:

Citation_Information:

Originator: V.A. Cross

Originator: J.F. Bratton

Originator: H.A. Michael

Originator: K.D. Kroeger

Originator: A. Green

Originator: E. Bergeron

Publication_Date: 2014

Title:

Continuous Resistivity Profiling and Seismic-Reflection Data Collected in April 2010 from Indian River Bay, Delaware

Edition: 1

Series_Information:

Series_Name: Open-File Report

Issue_Identification: 2011-1039

Publication_Information:

Publication_Place: Reston, VA

Publisher: U.S. Geological Survey

Online_Linkage: <http://pubs.usgs.gov/of/2011/1039/>

Online_Linkage: <http://dx.doi.org/10.3133/ofr20111039>

Description:

Abstract:

A geophysical survey to delineate the fresh-saline groundwater interface and associated sub-bottom sedimentary structures beneath Indian River Bay, Delaware, was carried out in April 2010. This included surveying at higher spatial resolution in the vicinity of a study site at Holts Landing, where intensive onshore and offshore studies were subsequently completed. The total length of continuous resistivity profiling (CRP) survey lines was 145 kilometers (km), with 36 km of chirp seismic lines surveyed around the perimeter of the bay. Medium-resolution CRP surveying was performed using a 50-meter streamer in a bay-wide grid. Results of the surveying and data inversion showed the presence of many buried paleochannels beneath Indian River Bay that generally extended perpendicular from the shoreline in areas of modern tributaries, tidal creeks, and marshes. An especially wide and deep paleochannel system was imaged in the southeastern part of the bay near White Creek. Many paleochannels also had high-resistivity anomalies corresponding to low-salinity groundwater plumes associated with them, likely due to the presence of fine-grained estuarine mud and peats in the channel fills that act as submarine confining units. Where present, these units allow plumes of low-salinity groundwater that was recharged onshore to move beyond the shoreline, creating a complex fresh-saline groundwater interface in the subsurface. The properties of this interface are important considerations in construction of accurate coastal groundwater flow models. These models are required to help predict how nutrient-rich groundwater, recharged in agricultural watersheds such as this one, makes its way into coastal bays and impacts surface water quality and estuarine ecosystems. For more information on the survey conducted for this project, see <http://woodshole.er.usgs.gov/operations/ia/public_ds_info.php?fa=2010-006-FA>.

Purpose:

The purpose of this shapefile is to release all the processed continuous resistivity profile data that occurs at the sediment water interface or below collected in the Indian River Bay on April 15, 2010. These data were processed with a single water resistivity value.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20100415

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -75.190212

East_Bounding_Coordinate: -75.076026

North_Bounding_Coordinate: 38.619776

South_Bounding_Coordinate: 38.576418

Keywords:

Theme:

Theme_Keyword_Thesaurus: General

Theme_Keyword: U.S. Geological Survey

Theme_Keyword: USGS

Theme_Keyword: Coastal and Marine Geology Program

Theme_Keyword: CMGP

Theme_Keyword: Woods Hole Coastal and Marine Science Center

Theme_Keyword: WHCMSC

Theme_Keyword: Field Activity Number 2010-006-FA

Theme_Keyword: Info Bank ID K-6-10-DL

Theme_Keyword: navigation

Theme_Keyword: bathymetry

Theme_Keyword: Continuous Resistivity Profiling

Theme_Keyword: CRP

Theme_Keyword: R/V Knob

Theme_Keyword: Lowrance GPS

Theme_Keyword: AGI SuperSting

Theme_Keyword: processed data

Theme_Keyword: groundwater

Theme_Keyword: submarine groundwater

Theme_Keyword: point shapefile

Theme_Keyword: Open-file Report 2011-1039

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: elevation

Theme_Keyword: location

Theme_Keyword: oceans

Theme_Keyword: oceans and estuaries

Theme_Keyword: oceans and coastal

Theme_Keyword: geoscientificInformation

Place:

Place_Keyword_Thesaurus: General

Place_Keyword: North America

Place_Keyword: North Atlantic Ocean

Place_Keyword: United States

Place_Keyword: Delaware

Place_Keyword: Indian River Bay

Place_Keyword: Indian River Inlet

Place_Keyword: Holts Landing

Place_Keyword: Piney Neck

Place_Keyword: Sussex County

Place_Keyword: Rosedale Beach

Access_Constraints: None.

Use_Constraints:

The public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset.

Point_of_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: Woods Hole Coastal and Marine Science Center

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

Browse_Graphic:

Browse_Graphic_File_Name:

<http://pubs.usgs.gov/of/2011/1039/data/resistivity/shapefile/mrgapr15_allxyzres.gif>

Browse_Graphic_File_Description:

Thumbnail GIF image showing the location of the processed CRP data in Indian River Bay collected on April 15, 2010. The coastline is included for spatial reference.

Browse_Graphic_File_Type: GIF

Native_Data_Set_Environment:

Microsoft Windows Vista Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.4095

Data_Quality_Information:

Logical_Consistency_Report: All the data files were checked and handled in the same manner.

Completeness_Report:

All of the CRP data processed with a single water resistivity value from April 15, 2010 are incorporated into this shapefile.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

The navigation system used was a Lowrance 480M with an LGC-2000 Global Positioning System (GPS) antenna. The antenna was located directly above the fathometer transducer mount point, and approximately 2 meters starboard of the mount point of the towed continuous resistivity profile streamer. GPS data are assumed to be accurate wtihin 10 meters on this survey.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

All bathymetry values were acquired by the 200 kHz Lowrance fathometer. The fathometer was mounted on the starboard side of the R/V Knob, directly below the GPS antenna. The Lowrance manufacturer indicates the speed of sound used by the system to calculate to depth is 4800 feet/second. The depth values are not corrected for the approximately 0.2 m transducer draft. All values are assumed to be accurate to within 1 meter. Some of the depths recorded as attributes are extracted from a gridded surface and are assumed to be accurate within 1 meter.

Lineage:

Source_Information:

Source_Contribution:

The continuous resistivity profile (CRP) system used on this cruise was an AGI SuperSting marine system described at the website: www.agiusa.com/marinesystem.shtml. The particular system used for this acquisition was a 50-m streamer with an 11 electrode array with electrodes spaced 5 meters apart. The source electrodes are graphite, while the receiver electrodes are 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 potential between electrode pairs in the remaining electrodes. The maximum depth below the water surface the streamer can reach is approximately 1/4 the streamer length. So for the 50-m streamer, maximum depth is about 12.5 meters. Each line of data acquisition records several files. The two files necessary for processing are the *.stg and the *.gps file. The STG file contains the resistivity data, while the GPS file contains the navigation information. The navigation system used in concert with the CRP system is a Lowrance LMS-480M with an LGC-2000 GPS antenna and a 200 kHz fathometer transducer. The antenna and fathometer transducer were mounted on the starboard side of the boat. The streamer tow point was on the port side aft. The layback offset between the navigation antenna and the first electrode was 17.6 meters on April 13 and 14. On April 15 the antenna and transducer were moved 1.6 m aft changing the layback offset to 16 m. This layback offset is accounted for by the acquisition system. The approximately 2 m lateral offset is not accounted for. The Lowrance transducer also contains a temperature sensor. Lowrance indicates the speed of sound used by the system is 4800 feet/second. Both the temperature and depth information are recorded in the logged GPS file. There are instances where no depth or temperature information is recorded due to an equipment problem. The CRP system images the subsurface electrical properties of an estuarine, riverine or lacustrine environment. Resistivity differences can be attributed to subsurface geology (conductive vs less conductive layers) and hydrogeologic conditions with fresh water exhibiting high resistivity and saline conditions showing low resistivity.

Process_Step:

Process_Description:

One of the resulting files from processing resistivity data with AGI's EarthImager software is an XYZ file. This XYZ file has three columns of information: distance along line (meters), resistivity reading depth (meters), resistivity value (ohm-m). One of the resulting files from linearization of the raw STG resistivity data is a DEP file. The DEP file has four columns of information: distance along line (meters), water depth (meters), latitude, longitude. This DEP file is dependent on the presence of bathymetry data in the originally recorded GPS file, or the addition of bathymetry information to that GPS file. This DEP file is used in the EarthImager processing and is carried over to the processing output. The MATLAB script justbelowsed.m combines these two data files such that the output is only the resistivity values that fall at or below the sediment water interface. This script was written by the USGS in Woods Hole. In order to have a value at the sediment water interface, the software usually has to interpolate values. The version of MATLAB used for these data was MATLAB 7.5.0.342 (R2007b). An example of the script usage in MATLAB is: justbelowsed('L10F1_lin_AllInvRes.xyz','L10F1_lin_wres.dep'). The output is: L10F1_lin_AllInvRes_jbsed.xyz. This resulting XYZ file has 5 columns of information: distance along line (meters); depth below water surface (meters); depth below sediment/water interface (meters); resistivity value (ohm-m); log(10) resistivity value. This process step and all subsequent process steps were performed by the same person - VeeAnn A. Cross.

Source_Used_Citation_Abbreviation: *.dep

Source_Used_Citation_Abbreviation: *.xyz

Process_Date: 201102

Source_Produced_Citation_Abbreviation: *jbsed.xyz

Process_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: Woods Hole Coastal and Marine Science Center

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

Process_Step:

Process_Description:

Using ArcMap 9.2 and VACExtras v 2.1 (extension developed by the USGS in Woods Hole) these XYZ files are converted to shapefiles. The tool in VACExtras to do this is "convert resistivity to shapefile". This tool requires the data frame be in a UTM projection, the active layer in the data frame needs to be a polyline shapefile with one record selected (the polyline navigation file) and the user is prompted for the file from justbelowsed.m. The program uses the distance along value to find an actual latitude and longitude. The software assumes the datum of the data layer and the data frame projection are the same. The conversion of the Easting and Northing locations to latitudes and longitudes is done by the tool. The result is a point shapefile with 11 columns of information. The Id attribute is automatically generated upon creation of a shapefile, the "line" attribute is the line name as indicated within the polyline shapefile that the program prompts the user for, "dist" is the distance along attribute carried over from the MATLAB file, the attributes of location information (latitude, longitude, utmx, utmy) are calculated by the tool, the attributes depth, dep_b_sed, resvalue, and reslogval are carried over from the MATLAB file. The Entity and Attribute section further describes these attributes and their units. An individual point shapefile is generated for each CRP polyline. In some instances of a sharp turn during data collection, the resistivity processing will split the line into multiple parts. On April 15, one line had to be split during the resistivity processing: L36F1. In the jbsed shapefile, the "line" attribute had to be modified to add the segment identifier to the line name. L36F1 has L36F1_a and L36F1_b.

Source_Used_Citation_Abbreviation: jd105gps_lines.shp

Source_Used_Citation_Abbreviation:

all the individual MATLAB generated *jbsed.xyz files from this day

Process_Date: 201102

Source_Produced_Citation_Abbreviation: *jbsed.shp

Process_Step:

Process_Description:

With all the individual point shapefiles from April 15, 2010 in ArcMap 9.2, ArcToolbox - Data management Tools - General - Merge was used to combine the individual files into a single shapefile. The input was all the individual point shapefiles, with the output being mrgapr15_allxyzres.shp. The field mapping was left at the defaults as all the input shapefiles have the same attributes.

Source_Used_Citation_Abbreviation: *jbsed.shp

Process_Date: 201102

Source_Produced_Citation_Abbreviation: mrgapr15_allxyzres.shp

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Entity point

Point_and_Vector_Object_Count: 1019062

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.000001

Longitude_Resolution: 0.000001

Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: D_WGS_1984

Ellipsoid_Name: WGS_1984

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257224

Vertical_Coordinate_System_Definition:

Depth_System_Definition:

Depth_Datum_Name: Local surface

Depth_Resolution: 0.1

Depth_Distance_Units: meters

Depth_Encoding_Method: Attribute values

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: mrgapr15_allxyzres

Entity_Type_Definition: ESRI point shapefile

Entity_Type_Definition_Source: ESRI

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: An automatically generated numeric value.

Attribute_Definition_Source: VACExtras v 2.1

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0

Range_Domain_Maximum: 0

Attribute:

Attribute_Label: line

Attribute_Definition:

The alphanumeric name corresponding to the prefix of the GPS filename. This name reflects the name assigned to the line of data acquisition and incorporates modifiers (part1, part2) to reflect modification of the GPS file if the GPS file was split into more than one part. Additionally, the name incorporates a modifier (a,b) if the resistivity line was split into more than one part during processing.

Attribute_Definition_Source: U.S. Geological Survey

Attribute_Domain_Values:

Unrepresentable_Domain: Character set.

Attribute:

Attribute_Label: dist

Attribute_Definition:

Distance along line in meters. Originally calculated by the AGI processing software and assumed to be based on the UTM projection appropriate for the area (UTM, Zone 18).

Attribute_Definition_Source: Processing software calculated.

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.1

Range_Domain_Maximum: 9665.9

Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: longitude

Attribute_Definition: Longitude position of the point (decimal degrees, WGS84)

Attribute_Definition_Source:

Processing software calculated (VACExtras - convert resistivity to shapefile).

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -75.190212

Range_Domain_Maximum: -75.076026

Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: latitude

Attribute_Definition: Latitude position of the point (decimal degrees, WGS84)

Attribute_Definition_Source:

Processing software calculated (VACExtras - convert resistivity to shapefile).

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 38.576418

Range_Domain_Maximum: 38.619776

Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: utmx

Attribute_Definition: Easting position of the point in meters (UTM, Zone 18, WGS84)

Attribute_Definition_Source:

Processing software calculated (VACExtras - convert resistivity to shapefile).

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 483435.2

Range_Domain_Maximum: 493380.7

Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: utmy

Attribute_Definition: Northing position of the point in meters (UTM, Zone 18, WGS84)

Attribute_Definition_Source:

Processing software calculated (VACExtras - convert resistivity to shapefile).

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 4269786.5

Range_Domain_Maximum: 4274589.5

Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: depth

Attribute_Definition:

Depth (meters) of the resistivity value below the water surface. This value is not corrected for tides or transducer draft.

Attribute_Definition_Source: Acquisition software derived.

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -12.32

Range_Domain_Maximum: -0.3

Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: dep_b_sed

Attribute_Definition:

Depth (meters) of the resistivity value below the sediment/water interface.

Attribute_Definition_Source: Processing software derived (MATLAB - justbelowsed.m).

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -12.02

Range_Domain_Maximum: 0

Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: resvalue

Attribute_Definition: Resistivity value of the data point in ohm-m.

Attribute_Definition_Source: Processing software calculated (AGI EarthImager).

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.116197

Range_Domain_Maximum: 104.529

Attribute_Units_of_Measure: ohm-m

Attribute:

Attribute_Label: reslogval

Attribute_Definition: Log(10) of the resistivity value.

Attribute_Definition_Source: Processing software calculated (MATLAB justbelowsed.m).

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -0.934803

Range_Domain_Maximum: 2.019237

Attribute_Units_of_Measure: Log(10) of ohm-m

Distribution_Information:

Distributor:

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: Woods Hole Coastal and Marine Science Center

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:

Neither the U.S. government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. 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. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: Shapefile

Format_Version_Number: ArcGIS 9.2

Format_Information_Content:

This WinZip (v. 14) file contains the point shapefile as well as the associated metadata files.

Transfer_Size: 24.4 MB

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

<http://pubs.usgs.gov/of/2011/1039/data/resistivity/shapefile/mrgapr15_allxyzres.zip>

Network_Resource_Name:

<http://pubs.usgs.gov/of/2011/1039/html/ofr2011-1039-catalog.html>

Network_Resource_Name: <http://dx.doi.org/10.3133/ofr20111039>

Fees: None.

Technical_Prerequisites:

This zip file contains data available in Esri point shapefile format. The user must have software capable of uncompressing the zip file and reading/displaying the shapefile.

Metadata_Reference_Information:

Metadata_Date: 20140630

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: Woods Hole Coastal and Marine Science Center

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

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