MRG2007_CORSICA_ALLXYZ.SHP: Processed Continuous Resistivity Profile (CRP) Data Below the Sediment Water Interface From the Corsica River Estuary, Maryland Collected from May 15 to May 17, 2007 on USGS Cruise 07005

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: John F. Bratton

Originator: VeeAnn A. Cross

Publication_Date: 2011

Title:

MRG2007_CORSICA_ALLXYZ.SHP: Processed Continuous Resistivity Profile (CRP) Data Below the Sediment Water Interface From the Corsica River Estuary, Maryland Collected from May 15 to May 17, 2007 on USGS Cruise 07005

Geospatial_Data_Presentation_Form: vector digital data

Series_Information:

Series_Name: Open-File Report

Issue_Identification: 2010-1094

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://pubs.usgs.gov/of/2010/1094/data/resistivity/shapefile/mrg2007_Corsica_allxyz.zip>

Online_Linkage: <https://pubs.usgs.gov/of/2010/1094/html/catalog.html>

Larger_Work_Citation:

Citation_Information:

Originator: VeeAnn A. Cross

Originator: John F. Bratton

Originator: Charles R. Worley

Originator: John Crusius

Originator: Kevin D. Kroeger

Publication_Date: 2011

Title:

Continuous resistivity profiling data from the Corsica River Estuary, Maryland

Series_Information:

Series_Name: Open-File Report

Issue_Identification: 2010-1094

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://pubs.usgs.gov/of/2010/1094/>

Description:

Abstract:

Submarine groundwater discharge (SGD) into Maryland's Corsica River Estuary was investigated as part of a larger study to determine the importance of nutrient delivery to Chesapeake Bay via this pathway. Resource managers are concerned about nutrients that are entering the estuary via submarine groundwater discharge from this primarily agricultural watershed that may be contributing to eutrophication, harmful algal blooms, and fish kills. An interdisciplinary U.S. Geological Survey (USGS) science team conducted field operations in the estuary in April and May 2007. Techniques used included continuous resistivity profiling (CRP), piezometer sampling, seepage meter measurements, and collection of a radon tracer time series. Better understanding of the style, locations, and rates of groundwater discharge could lead to improved models and mitigation strategies for estuarine nutrient over-enrichment in the Corsica River Estuary, and other similar settings. More information on the field work can be accessed from the Woods Hole Coastal and Marine Science Center Field Activity webpage: <http://quashnet.er.usgs.gov/data/2007/07005/>

Purpose:

The purpose of this dataset is to release in shapefile format all the processed continuous resistivity profile data that occurs at the sediment water interface or below collected on USGS cruise 07005. Additionally, the release of this data acts as a data archive.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20070515

Ending_Date: 20070517

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -76.149889

East_Bounding_Coordinate: -76.106225

North_Bounding_Coordinate: 39.090783

South_Bounding_Coordinate: 39.072401

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 Serial Number 07005

Theme_Keyword: Field Activity Number 2007-005-FA

Theme_Keyword: Info Bank ID T-1-07-CH

Theme_Keyword: navigation

Theme_Keyword: bathymetry

Theme_Keyword: Continuous Resistivity Profiling

Theme_Keyword: CRP

Theme_Keyword: R/V Terrapin

Theme_Keyword: Lowrance GPS

Theme_Keyword: AGI SuperSting

Theme_Keyword: processed data

Theme_Keyword: groundwater

Theme_Keyword: submarine groundwater

Theme_Keyword: point shapefile

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: inlandWaters

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

Place_Keyword: United States

Place_Keyword: Maryland

Place_Keyword: Corsica River Estuary

Place_Keyword: Chesapeake Bay

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:

<https://pubs.usgs.gov/of/2010/1094/data/resistivity/shapefile/mrg2007_Corsica_allxyz.gif>

Browse_Graphic_File_Description:

Thumbnail image showing the location of the processed CRP data. The coastline is included for spatial reference.

Browse_Graphic_File_Type: GIF

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.2.6.1500

Data_Quality_Information:

Logical_Consistency_Report:

In cases where a fathometer measured the water depths, the depth attribute will always be less (more negative) than the depth_b_sed attribute (depth below sediment water interface). However, in cases where the depth value was derived from another source - which additionally required an offset applied to the value - it's possible to get depth values that are greater than (less negative) than the depth_b_sed attribute. In cases where this happens, it's only a matter of 20 cm or less.

Completeness_Report:

This represents all the processed resistivity files from the data files in which depth was a part of the original file, or where I was able to acquire depth from another source. The lines that needed further processing in order to derive depth values were L12F1, L24F1, L24F2, L25F1, L26F1, L27F1_part1, L27F1_part2, and L28F1.

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 at the anchor point for the resistivity streamer, which is also directly above the fathometer transducer mount point. The GPS system is published to be accurate to within 10 meters.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

All field collected bathymetry values were collected by the 200 kHz Lowrance fathometer. The fathometer was mounted starboard side aft, directly below the GPS antenna and the resistivity streamer tow point. The Lowrance manufacturer indicates the speed of sound used by the system to convert to depths is 4800 feet/second. All values are assumed to be accurate to within 1 meter. In order to incorporate all the resistivity data, CRP lines that did not concurrently acquire bathymetry data were further processed to extract bathymetric values from existing elevation data. The vertical accuracy of these files is a function of several factors. First of all is the accuracy of the original bathymetry dataset from which the depth values were extracted. And second is the offset applied to this bathymetry value to essentially add in the tidal component. Specific tide values were not acquired, but rather the grid bathymetry values were compared to actual valid fathometer reading to estimate and offset. These factors combine to detract from the vertical accuracy, making it probably more than 1 meter. The lines that needed further processing in order to derive depth values were L12F1, L24F1, L24F2, L25F1, L26F1, L27F1_part1, L27F1_part2, and L28F1.

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 ¼ 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 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:

A MATLAB script (justbelowsed.m) was run on the processed CRP files to generate files with just the resistivity values that fall below the sediment water interface, and an extrapolated value at the sediment water interface. Two files from the processed resistivity data are needed for this script: the XYZ output from the EarthImager processing which has distance along line (meters), depth of resistivity reading (meters), and resistivity value (ohm-m); and the DEP file that contains distance along line (meters) and water depth values (meters). As noted in the vertical accuracy report, not all lines successfully collected fathometer data at the time of data collection and had to be further processed to derive bathymetric information. Also, because some lines are short and don't require a "roll-along" processing technique, the XYZ information is contained in a file with the DAT extension. The MATLAB script combines the two data files (processed resistivity and depth 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 (VeeAnn A. Cross) in Woods Hole, Ma. In order to have a resistivity value at the sediment water interface, the software usually has to interpolate resistivity 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.
See the metadata for the fixed bathymetry "fixbathyraw" available at: <https://pubs.usgs.gov/of/2010/1094/html/catalog.html> under the CRP data section for a full explanation of how bathymetry values were derived when none were collected in the field.

Source_Used_Citation_Abbreviation: *.xyz or *.dat

Source_Used_Citation_Abbreviation: *.dep

Process_Date: 201004

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.

Source_Used_Citation_Abbreviation: *_jbsed.xyz

Source_Used_Citation_Abbreviation: resgpslns_jd135.shp

Source_Used_Citation_Abbreviation: resgpslns_jd136.shp

Source_Used_Citation_Abbreviation: resgpslns_jd137.shp

Process_Date: 201004

Source_Produced_Citation_Abbreviation: all the point shapefiles for each individual line.

Process_Step:

Process_Description:

With all the individual point shapefiles 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 mrg2007_Corsica_allxyz.shp. No field mapping was necessary as all input shapefiles have the same attributes - and all attributes were carried over to the merged output shapefile.

Source_Used_Citation_Abbreviation: all the individual point shapefiles

Process_Date: 201004

Source_Produced_Citation_Abbreviation: mrg2007_Corsica_allxyz.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: 1257500

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: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257222

Vertical_Coordinate_System_Definition:

Depth_System_Definition:

Depth_Datum_Name: Local surface

Depth_Resolution: 0.1

Depth_Distance_Units: meters

Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: mrg2007_Corsica_allxyz

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 individual line of data collection that the point comes from.

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 calculate by the AGI processing software.

Attribute_Definition_Source: Processing software calculated.

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0

Range_Domain_Maximum: 3923.4

Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: longitude

Attribute_Definition: Longitude position of the point (decimal degrees, NAD83)

Attribute_Definition_Source:

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

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -76.149889

Range_Domain_Maximum: -76.106225

Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: latitude

Attribute_Definition: Latitude position of the point (decimal degrees, NAD83)

Attribute_Definition_Source:

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

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 39.072401

Range_Domain_Maximum: 39.090783

Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: utmx

Attribute_Definition: Easting position of the point in meters (UTM, Zone 18, NAD83).

Attribute_Definition_Source:

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

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 400539.1

Range_Domain_Maximum: 404331.3

Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: utmy

Attribute_Definition: Northing position of the point in meters (UTM, Zone 18, NAD83).

Attribute_Definition_Source:

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

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 4325408.8

Range_Domain_Maximum: 4327433.3

Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: depth

Attribute_Definition:

Depth (meters) of the resistivity value below the water surface.

Attribute_Definition_Source: Acquisition/processing software derived.

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -12.32

Range_Domain_Maximum: 0

Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: dep_b_sed

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

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

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -12.52

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: 0.1

Range_Domain_Maximum: 848.801

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: -1

Range_Domain_Maximum: 2.928806

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: WinZip

Format_Version_Number: 9.0

Format_Information_Content:

This WinZip file contains the point shapefile as well as the associated metadata files.

Transfer_Size: 29.5 MB

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <https://pubs.usgs.gov/of/2010/1094/html/catalog.html>

Network_Resource_Name:

<https://pubs.usgs.gov/of/2010/1094/data/resistivity/shapefile/mrg2007_Corsical_allxyz.zip>

Offline_Option:

Offline_Media: DVD-ROM

Recording_Capacity:

Recording_Density: 4.75

Recording_Density_Units: GBytes

Recording_Format: UDF

Fees: none

Technical_Prerequisites:

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

Metadata_Reference_Information:

Metadata_Date: 20110307

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