IR_100SHOT_SORT.SHP: Point shapefile (100 shot interval) of navigation for chirp seismic data collected in the Indian River Bay, Delaware, on April 13, 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: John F. Bratton

Originator: VeeAnn A. Cross

Publication_Date: 2014

Title:

IR_100SHOT_SORT.SHP: Point shapefile (100 shot interval) of navigation for chirp seismic data collected in the Indian River Bay, Delaware, on April 13, 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/navigation/seismics/ir_100shot_sort.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 the data layer is to provide the 100 shot point navigation associated with the seismic-reflection profiles collected on U.S. Geological Survey Field Activity Number 2010-006-FA. This information helps correlate the seismic-reflection profiles with other features and data in the GIS. The 100 shot interval corresponds to tic marks on the seismic-reflection profile JPEG images.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20100413

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -75.202086

East_Bounding_Coordinate: -75.062936

North_Bounding_Coordinate: 38.618983

South_Bounding_Coordinate: 38.569244

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: shot point navigation

Theme_Keyword: seismic navigation

Theme_Keyword: R/V Knob

Theme_Keyword: Lowrance GPS

Theme_Keyword: point shapefile

Theme_Keyword: EdgeTech 424

Theme_Keyword: chirp seismics

Theme_Keyword: Open-file Report 2011-1039

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: location

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 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/navigation/seismics/ir_100shot_sort.gif>

Browse_Graphic_File_Description:

Thumbnail GIF images showing the 100 shot point location of seismics collected in Indian River Bay. 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:

These points were visually checked to make sure they were viable fixes.

Completeness_Report:

This shapefile represents the 100 shot interval navigation for all the seismic lines collected on this cruise.

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 above the seismic towfish tow point. The system towfish was attached by a short line to a cleat on a 2 x 6 board that was clamped across the bow of the boat. The towfish was on the starboard side of the boat, approximately 0.5 meters below the water surface. GPS data are assumed to be accurate within 10 meters on this survey.

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 towfish was attached to a cleat by a short line on the starboard side of the boat. The transducer draft was approximately 0.5 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 an EdgeTech 424 Chirp sub-bottom system with a 4 to 24 kHz pulse bandwidth and a 2 ms pulse. The system towfish was attached by a short line to a cleat on a 2 x 6 board that was clamped across the bow of the boat. The towfish was on the starboard side of the boat, approximately 0.5 meters below the water surface. The acquisition software used to record the data was Discover 3100 version 7.01. The data were recorded in the SEG-Y data format IBM floating point with navigation supplied by the Lowrance GPS system. The navigation was recorded in the header of the seismic data in an arc second format. The record length is 133 ms, with a sample interval of 23 micro-seconds and 5788 samples per trace. The fire-rate was between 4 and 6 shots per second. The GPS antenna was located above the tow position of the seismic transducer.

Process_Step:

Process_Description:

Using the calibrated polyline shapefile (ir_Routes_Calib available at <http://pubs.usgs.gov/of/2011/1039/html/ofr2011-1039-catalog.html>), hatches were added at the beginning and end of each line, as well as at 100 shot spacing. This was done in ArcMap 9.2 by opening the layer properties and selecting the Hatches tab. Create a hatch interval of 100 for the Hatch Class, then for Hatch Def(1) place a marker hatch every 1 hatch interval. From the Hatch Class Add a Hatch Definition - Add End Hatch Definition and set these to a marker Hatch. By displaying the labels for both Hatch Definitions, a quick comparison between the hatches and the unique shot navigation makes sure things are behaving as intended. Then turn the labels off. This process step and all subsequent process steps were performed by the same person: VeeAnn A. Cross.

Source_Used_Citation_Abbreviation: ir_Routes_Calib.shp

Process_Date: 201101

Source_Produced_Citation_Abbreviation: ir_Routes_Calib.shp

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:

Within ArcMap 9.2 - by going to Tools - Customize - Commands and scrolling down to the Category "Linear Referencing", the icon for the command "Convert Hatches to Graphics can be added to a toolbar. Once this is done, that tool can be used to convert the hatches to graphics.

Source_Used_Citation_Abbreviation: ir_Routes_Calib.shp

Process_Date: 201101

Source_Produced_Citation_Abbreviation: graphics

Process_Step:

Process_Description:

Convert these graphics to a shapefile using XTools Pro version 5.2. XTools Pro - Feature Conversions - Convert Graphics to Shapes. Source graphics layer: default, graphics element type: points. Output: ir_100shot_graphics.shp

Source_Used_Citation_Abbreviation: graphics

Process_Date: 201101

Source_Produced_Citation_Abbreviation: ir_100shot_graphics.shp

Process_Step:

Process_Description:

Use ArcMap 9.2 - ArcToolbox - Linear Referencing Tools - Locate Features Along Route. Use the following parameters: input - ir_100shot_graphics; input route features - ir_Routes_Calib; route identifier field - linename; search radius - 5 meters; output event table - ir_100shot_LocateFeatures.dbf. Output event table properties: route identifier field - linename; event type - point (default); measure field - shot. Left rest of options at default (all checked).

Source_Used_Citation_Abbreviation: ir_Routes_Calib.shp

Process_Date: 201101

Source_Produced_Citation_Abbreviation: ir_100shot_LocateFeatures.dbf

Process_Step:

Process_Description:

Use ArcMap 9.2 - ArcToolbox - Linear Referencing Tools - Make route Event Layer to create an event feature using the following parameters: input route features - ir_Routes_Calib; route identifier field - linename; input event table - ir_100shot_LocateFeatures; route identifier field - linename; event type - point; measure field - shot. Rest of the option left at default values.

Source_Used_Citation_Abbreviation: ir_Routes_Calib.shp

Source_Used_Citation_Abbreviation: ir_100shot_LocateFeatures.dbf

Process_Date: 201101

Source_Produced_Citation_Abbreviation: ir_100shot_LocateFeatures Events

Process_Step:

Process_Description:

Convert the event layer to a shapefile in ArcMap 9.2 by exporting the data (right mouse click on event layer, Data, Export Data). Output: ir_shot100tmp.shp

Source_Used_Citation_Abbreviation: ir_100shot_LocateFeatures Events

Process_Date: 201101

Source_Produced_Citation_Abbreviation: ir_shot100tmp.shp

Process_Step:

Process_Description:

Within ArcMap 9.2 use VAC Extras version 2.1 (an extension written by the USGS in Woods Hole) to sort the shapefile. VAC Extras - FeatConv - Table Sort with the shot file sorted based on linename and shot. Linename was set as the primary sort field, ascending order. Shot was set as the secondary sort field - ascending order. Output to ir_100shot_sort.shp.

Source_Used_Citation_Abbreviation: ir_shot100tmp.shp

Process_Date: 201101

Source_Produced_Citation_Abbreviation: ir_100shot_sort.shp

Process_Step:

Process_Description:

Because there are instances where the seismic acquisition automatically switched files, there are instance where the end shot of one line is in the same location as the start shot of the next line. An example of this are the lines l1f2 and l1f2.001. This issue leads to a duplicate shot #1 at these boundaries. The first shot #1 as it appears in the table should reflect the linename of the previous line, and it's ending shot number. For example, the first occurrence of l1f2.001 had the linename edited to be l1f2, and the shot value changed from 1 to 8959. The ending shot number was determined by displaying the hatch labels on the calibrated polyline generated earlier in the process steps. On line l5f2 there are 3 points with the shot number 1500. The problem with this line is they did a loop. Because the line crossed itself, the confusion as to the location of shot 1500 arose. Using the editor, I deleted the 2 shot 1500's that don't belong, and manually moved the location of the remaining shot 1500 to correspond to the calibrated polyline position of that shot number combined with the information from the shapefile containing all the original shot point navigation. Users will have to be careful if using the calibrated shot measures for this looped line in the loop area.

Source_Used_Citation_Abbreviation: ir_100shot_sort.shp

Process_Date: 201101

Source_Produced_Citation_Abbreviation: ir_100shot_sort.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: 1086

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

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: ir_100shot_sort

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: linename

Attribute_Definition:

The unique identifier for each line of data acquistion. This is the prefix of the SEG-Y filename.

Attribute_Definition_Source: U.S. Geological Survey

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: 8966

Attribute_Units_of_Measure: shot

Attribute:

Attribute_Label: Distance

Attribute_Definition:

The distance that the point falls off the calibrated route polyline. Unsure of units as all values are zeros and the work was done in a geographic coordinate system. Of note, one point was manually moved (discussed in the process steps) and may not fall exactly on the line. This is shot 1500 on line l5f2.

Attribute_Definition_Source: Esri linear Referencing - Locate Feature Along Routes tool

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0

Range_Domain_Maximum: 0

Attribute_Units_of_Measure: unknown

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: 0.09 MB

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

<http://pubs.usgs.gov/of/2011/1039/data/navigation/seismics/ir_100shot_sort.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