ALLSHOTS_GEOG.SHP: Point Shapefile of All the Unique Seismic Shot Point Navigation Collected in the Potomac River/Chesapeake Bay from Sept. 6, 2006 to Sept. 8, 2006 on USGS Cruise 06018

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: David S. Foster

Originator: VeeAnn A. Cross

Publication_Date: 2010

Title:

ALLSHOTS_GEOG.SHP: Point Shapefile of All the Unique Seismic Shot Point Navigation Collected in the Potomac River/Chesapeake Bay from Sept. 6, 2006 to Sept. 8, 2006 on USGS Cruise 06018

Geospatial_Data_Presentation_Form: vector digital data

Series_Information:

Series_Name: Open-File Report

Issue_Identification: 2009-1151

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/2009/1151/data/navigation/seismics/allshots_geog.zip>

Online_Linkage: <https://pubs.usgs.gov/of/2009/1151/html/catalog.html>

Larger_Work_Citation:

Citation_Information:

Originator: VeeAnn A. Cross

Originator: David S. Foster

Originator: John F. Bratton

Publication_Date: 2010

Title:

Continuous Resistivity Profiling and Seismic-Reflection Data Collected in 2006 from the Potomac River Estuary, Virginia and Maryland

Series_Information:

Series_Name: Open-File Report

Issue_Identification: 2009-1151

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/2009/1151/>

Description:

Abstract:

In order to test hypotheses about groundwater flow under and into Chesapeake Bay, geophysical surveys were conducted by U.S. Geological Survey (USGS) scientists on Chesapeake Bay and the Potomac River Estuary in September 2006. Chesapeake Bay resource managers are concerned about nutrients that are entering the estuary via submarine groundwater discharge, which are contributing to eutrophication. The USGS has performed many related studies in recent years to provide managers with information necessary to make informed decisions about this issue. The research carried out as part of the study described here was designed to help refine nutrient budgets for Chesapeake Bay by characterizing submarine groundwater flow and discharge of groundwater beneath part of the mainstem and a major tributary, the Potomac River Estuary.

Purpose:

The purpose of the data layer is to provide all of the unique shot point navigation associated with the seismic-reflection profiles collected on USGS cruise 06018.. This information can help correlate the seismic-reflection profiles with other features and data in the GIS. This clean, unique shot point navigation is also used as the navigation when loading the seismic data into a digital interpretation software package.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20060906

Ending_Date: 20060908

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -76.856667

East_Bounding_Coordinate: -76.310249

North_Bounding_Coordinate: 38.295665

South_Bounding_Coordinate: 37.946077

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 06018

Theme_Keyword: Info Bank ID K-1-06-CH

Theme_Keyword: R/V Kerhin

Theme_Keyword: seismic-reflection navigation

Theme_Keyword: shot point navigation

Theme_Keyword: point shapefile

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: location

Theme_Keyword: inlandWaters

Theme_Keyword: oceans

Theme_Keyword: oceans and estuaries

Theme_Keyword: oceans and coastal

Place:

Place_Keyword_Thesaurus: General

Place_Keyword: North America

Place_Keyword: North Atlantic

Place_Keyword: United States

Place_Keyword: Virginia

Place_Keyword: Potomac River Estuary

Place_Keyword: Chesapeake Bay

Place_Keyword: Dennis Point Marina

Place_Keyword: Solomons, Maryland

Place_Keyword: Maryland

Place_Keyword: Patuxent River

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: John F. Bratton

Contact_Organization: U.S. Geological Survey

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 x2254

Contact_Facsimile_Telephone: (508) 457-2310

Contact_Electronic_Mail_Address: jbratton@usgs.gov

Browse_Graphic:

Browse_Graphic_File_Name:

<https://pubs.usgs.gov/of/2009/1151/data/navigation/seismics/allshots_geog.gif>

Browse_Graphic_File_Description:

Thumbnail image showing the location of all the unique seismic shot point navigation collected Sept. 6-8, 2006. 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

Cross_Reference:

Citation_Information:

Originator: Michael W. Norris

Originator: Alan K. Faichney

Publication_Date: 2002

Title: SEG Y rev1 Data Exchange Format

Geospatial_Data_Presentation_Form: document

Publication_Information:

Publication_Place: Tulsa, OK

Publisher: Society of Exploration Geophysicists

Online_Linkage:

<http://www.seg.org/SEGportalWEBproject/prod/SEG-Publications/Pub-Technical-Standards/Documents/seg_y_rev1.pdf>

Cross_Reference:

Citation_Information:

Originator: John W. Stockwell Jr.

Originator: Jack K. Cohen

Publication_Date: 2008

Title: The New SU User's Manual (version 4.0)

Geospatial_Data_Presentation_Form: document

Publication_Information:

Publication_Place: Golden, CO

Publisher: Center for Wave Phenomena - Colorado School of Mines

Online_Linkage: <http://www.cwp.mines.edu/cwpcodes/>

Data_Quality_Information:

Logical_Consistency_Report:

These points were visually checked to make sure they were viable fixes. All days were handled the same way, even though the acquisition software changed during the cruise.

Completeness_Report:

This shapefile represents all the unique shot point navigation collected during USGS cruise 06018.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

A differential global positioning system (DGPS) was used for the seismic-reflection data. This system was an Ashtech DGPS2 with the navigation being recorded by HYPACK navigation software. The offset from the seismic transducer to the DGPS antenna was 2 meters. This offset was not entered into the software.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

Although bathymetry was not recorded directly with this system, bathymetry can be derived by tracing the seafloor reflector in the seismic-reflection profiles. The seismic transducers were mounted on an over the side mount on the port side of the ship. The transducer draft was 0.7 m below the water surface. The draft offset was not included in the data acquisition.

Lineage:

Source_Information:

Source_Contribution:

The seismic acquisition system used on this cruise was a Knudsen Engineering Limited (KEL) 1600 USB system. The system has up to 1.2 kW power and is tuned to work with two Massa 3.5 kHz transducers. The transducers were mounted on an over-the-side mount on the port side of the ship. The transducer draft was 0.7 m below the water surface. This draft offset was not included in the data acquisition. The seismic data acquisition software was SounderSuite-USB Beta. This system failed to acquire navigation data from the DGPS NEMA string on the first two days (Julian day 149 and 150). The software was also not able to record data in SEG-Y standard format. KEL KEB format files were logged to disk. In addition, KEA ASCII files with shot (ping) numbers and times were saved to disk. Shot point navigation was also absent in the KEA files on Julian days 149 and 150. On Julian day 151 a patched version of SounderSuite was received and installed. This version recorded navigation in the KEB and KEA files. SEG-Y recording was still not an option. A time server was used to synchronize the DGPS time on the KEL and HYPACK navigation systems. This was important as KEL SounderSuite records system time. Data were acquired at a 20 micro-second sample interval, 2048 samples for a 40 ms record length. Fire-rate was 0.20 seconds (or 5 shots per second). The KEL SounderSuite software was set up to automatically switch files at shot 20,000. Line 5 switched from file 0005_2006_249_2014_002.keb after shot 13509 to a new file (0005_2006_249_2014_003.keb) while changing display parameters, due to a bug in the acquisition software.

Process_Step:

Process_Description:

The KEL SounderSuite acquisition system records two files with every seismic profile. The file containing the seismic data has the extension KEB. The files with the KEA extension are the ASCII navigation files. The prefix filenames are of the format LLLL_YYYY_JJJ_HHMM_FFF where LLLL refers to the line number, YYYY refers to the year of acquisition, JJJ refers to the Julian day of acquisition, HHMM refers to the hour and minute of the start of acquisition, and FFF refers to the file number associated with the line. Because the KEL software was set to increment the file number at 20,000 shots, it's possible to have multiple files for a single line of acquisition. An example filename is: 0024_2006_251_1733_002. This is line 24, collected in the year 2006 on Julian day 251 with a start time of 17:33. This is part 2 of line 24. KEB seismic files were converted to standard SEG-Y files using KEL's PostSurvey version 1.56 software. During the first two days of data acquisition (Julian day 249 and 250 - Sept. 6 and Sept 7), the seismic acquisition software failed to record the navigation data from the DGPS NEMA string in the KEB and KEA files. However, after receiving a patched version of the SounderSuite software, navigation was recorded in the KEB and KEA seismic files. The KEB file is the KEL format seismic profile, while the KEA files is the KEL ASCII navigation file. On the first two days, the KEA files recorded shot number and times. A time server was used to synchronize the GPS time on the KEL with the HYPACK navigation system as the KEL SounderSuite records system time. The prefix filenames are of the format LLLL_YYYY_JJJ_HHMM_FFF where LLLL refers to the line number, YYYY refers to the year of acquisition, JJJ refers to the Julian day of acquisition, HHMM refers to the hour and minute of the start of acquisition, and FFF refers to the file number associated with the line. Because the KEL software was set to increment the file number at 20,000 shots, it's possible to have multiple files for a single line of acquisition. An example filename is: 0024_2006_251_1733_002. This is line 24, collected in the year 2006 on Julian day 251 with a start time of 17:33. This is part 2 of line 24.

Source_Used_Citation_Abbreviation: *.keb

Source_Used_Citation_Abbreviation: *.kea

Process_Date: 2006

Source_Produced_Citation_Abbreviation: *.sgy

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:

All KEB, KEA, and SEG-Y files were transferred to an external hard drive and transferred to a Mac OSX PowerBook for further processing. KEB files were converted to match-filtered standard SEG-Y using KEL's PostSurvey version 1.56 software.

Source_Used_Citation_Abbreviation: *.sgy

Process_Date: 2006

Source_Produced_Citation_Abbreviation: *.sgy

Process_Step:

Process_Description:

The processed SEG-Y files were read and converted to SeismicUnix (SU) format trace data.

Source_Used_Citation_Abbreviation: *.sgy

Process_Date: 2006

Source_Produced_Citation_Abbreviation: *.su

Process_Step:

Process_Description:

The shot number and time of day were extracted from the SU headers and saved in an ASCII file.

Process_Date: 2006

Process_Step:

Process_Description:

An AWK script was used to parse the one-second HYPACK navigation files to output time of day and UTM, zone 18 eastings and northings. A navigation file with Julian day, time, and UTM zone 18 coordinates was concatenated for each Julian day (coordinates were rounded to integers).

Process_Date: 2006

Process_Step:

Process_Description:

The ASCII navigation data were merged with the shot point and time files based on the common field of Julian day, hours, minutes, and seconds using the Unix command "join" on a Mac OS X computer. The output is a shot point navigation file with fixes every five shots (1 second) for the KEL Chirp data. Julian day 151 was processed the same even though position was available in the trace headers. A command line example of the join command is:

 join 0001_2006_249_1340_001.txt jd249_utm.txt >  0001_2006_249_1340_001.spt

Process_Date: 2006

Process_Step:

Process_Description:

An AWK script was run within a shell script on a Mac OS X to take the complete seismic navigation and reformat it with Cruise ID, linename, shot, easting and northing. The shell script formatjday:

#! /bin/csh
 awk '{FS=" "} {OFS=" "} {printf "%5s %25s %5.0f %6s %7s\n", \
cruise,line,$2,$3,$4,$1} ' cruise=06018 line=$1 $1.spt >> $2.spnav

This shell script could be called with the following command line example:

formatjday 0001_2006_249_1340_001 249

Source_Used_Citation_Abbreviation:

*.spt where * refers to each navigation file from a given Julian day

Process_Date: 2006

Source_Produced_Citation_Abbreviation: *.spnav (where * refers to Julian day)

Process_Step:

Process_Description:

Each file from a single Julian day was combined into a single text file using the Unix "cat" command.

Source_Used_Citation_Abbreviation: *.spnav (where * refers to the Julian day)

Process_Date: 2006

Source_Produced_Citation_Abbreviation: 06018_knudsen.spnav

Process_Step:

Process_Description:

The combined file was renamed with the extension TXT and a header line was added to the file. This file was then added to ArcMap 9.0 as an event theme using Tools - Add XY data and defining the projection as UTM, zone 18, NAD83. The x field is the easting field, and the y field is the northing field. The event theme was then exported as a shapefile by right-mouse clicking on the theme - Data - Export.

Source_Used_Citation_Abbreviation: 06018_knudsen.txt

Process_Date: 2006

Source_Produced_Citation_Abbreviation: allshots.shp

Process_Step:

Process_Description:

The first recorded line for line 5 needed to be split into two parts. The file naming in terms of files as the ship travels was originally - part 2, part 1, part 4. In order to better use this shapefile for future work which will sort on filename, shots were renamed from "part 1" to fit in with the direction of boat travel so that now there is part 2, part 3, part 4. (the original part 1 is now part 3).

Source_Used_Citation_Abbreviation: allshots.shp

Process_Date: 2006

Source_Produced_Citation_Abbreviation: allshots.shp

Process_Step:

Process_Description:

The shot point shapefile was reprojected to Geographic, NAD83 using ArcMap 9.2, ArcToolbox - Data management Tools - Projections and Transformations - Feature - Project. Because the input file and output file have the same datum, no datum transformation was required.

Source_Used_Citation_Abbreviation: allshots.shp

Process_Date: 2009

Source_Produced_Citation_Abbreviation: allshots_geog.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: 79510

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

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: allshots_geog

Entity_Type_Definition: Shapefile attribute table.

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: cruiseid

Attribute_Definition:

The cruise identification assigned by the Woods Hole Coastal and Marine Science Center. The original ID was 06018, but upon being converted to a shapefile, the leading zero was dropped by the software.

Attribute_Definition_Source: USGS

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 6018

Enumerated_Domain_Value_Definition:

Cruise ID 06018 - the ESRI software treats this field as numeric, so dropped the leading zero of the identifier.

Enumerated_Domain_Value_Definition_Source: Woods Hole Coastal and Marine Science Center

Attribute:

Attribute_Label: linename

Attribute_Definition: The unique identifier for each line of data acquisition.

Attribute_Definition_Source: Software generated.

Attribute_Domain_Values:

Unrepresentable_Domain: Character set.

Attribute:

Attribute_Label: shot

Attribute_Definition: The seismic shot number associated with the navigation fix.

Attribute_Definition_Source: Software generated.

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1

Range_Domain_Maximum: 20000

Attribute_Units_of_Measure: shot number

Attribute:

Attribute_Label: easting

Attribute_Definition:

Easting (x) coordinate of navigation fix in UTM, Zone 18, NAD83.

Attribute_Definition_Source: Compiler

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 337367

Range_Domain_Maximum: 385176

Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: northing

Attribute_Definition:

Northing (y) coordinate of navigation fix in UTM, Zone 18, NAD83.

Attribute_Definition_Source: Compiler

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 4200670

Range_Domain_Maximum: 4239508

Attribute_Units_of_Measure: meters

Distribution_Information:

Distributor:

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: 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 x2254

Contact_Facsimile_Telephone: (508) 457-2310

Contact_Electronic_Mail_Address: jbratton@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: 2.175 MB

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

<https://pubs.usgs.gov/of/2009/1151/data/navigation/seismics/allshots_geog.zip>

Network_Resource_Name: <https://pubs.usgs.gov/of/2009/1151/html/catalog.html>

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: 20100325

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