Ground Penetrating Radar (GPR) Trackline Locations Collected from Dauphin Island, Alabama in April 2013

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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: Arnell S. Forde
Publication_Date: 2016
Title:

Ground Penetrating Radar (GPR) Trackline Locations Collected from Dauphin Island, Alabama in April 2013

Geospatial_Data_Presentation_Form: Vector Digital Data Set (Polyline)
Online_Linkage: https://pubs.usgs.gov/ds/0982/downloads/13BIM01_gis_data.zip
Larger_Work_Citation:

Citation_Information:

Originator: Arnell S. Forde
Originator: Christopher G. Smith
Originator: Billy J. Reynolds
Publication_Date: 2016
Title:

Archive of Ground Penetrating Radar Data Collected During USGS Field Activity 13BIM01: Dauphin Island, Alabama, April 2013

Geospatial_Data_Presentation_Form: Publication (Other)
Series_Information:

Series_Name: U.S. Geological Survey Data Series
Issue_Identification: 982

Publication_Information:

Publication_Place: St. Petersburg, FL
Publisher: U.S. Geological Survey

Online_Linkage: https://doi.org/10.3133/ds982

Description:

Abstract:

From April 13-20, 2013, scientists from the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center (USGS-SPCMSC) conducted geophysical surveys and collected sediment samples from Dauphin Island, Alabama. This dataset, Ground Penetrating Radar (GPR) Trackline Locations Collected from Dauphin Island, Alabama, in April 2013, contains geospatial data and raster images of the GPR data. The GPR trackline locations are presented as Geographic Information System (GIS) files and the subsurface profile data are provided as images in Joint Photographic Experts Group (JPEG) format.

Purpose:

The objectives of this study were to quantify inorganic and organic accretion rates in back-barrier and mainland marsh and estuarine environments. Various field and laboratory methods were used to achieve these objectives, including, subsurface imaging using GPR, sediment sampling, lithologic and microfossil analyses, and geochronology techniques to produce barrier island stratigraphic cross sections to help interpret the recent (last 2000 years) geologic evolution of the island.

Supplemental_Information:

Data were collected during USGS field activity number 13BIM01, additional survey details are available at http://cmgds.marine.usgs.gov/fan_info.php?fan=13BIM01. Funding for this survey was provided by the USGS Coastal and Marine Geology Program’s Barrier Island Evolution Research (BIER) project (http://coastal.er.usgs.gov/bier/). The GIS data for this survey are provided in Environmental Systems Research Institute (Esri) polyline shapefile (.shp) and Keyhole Markup Language (KML) formats; these files can be opened using the free ArcGIS Explorer or Google Earth GIS viewers. The .kml files, profile images, map document, and shapefile used to create the hyperlinked GPR trackline map can be found at pubs.usgs.gov/ds/0982/ds_data_downloads.html. Included in the GIS .zip file is a folder called “images,” which stores the .jpg images of each trackline's subsurface profile. To access these images using ArcMap 10.2, open the map document and then click on the hyperlink button (the symbol is a lightning bolt) located on the toolbar. Once this button is activated, the tracklines will all change to blue, indicating they have hyperlinks. Selecting a trackline will open the associated profile image.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20130415
Ending_Date: 20130417

Currentness_Reference: ground condition

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -88.195013
East_Bounding_Coordinate: -88.074726
North_Bounding_Coordinate: 30.258131
South_Bounding_Coordinate: 30.243289

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:a6d15594-a01a-4659-930a-4a9bd70746f7

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword: Ground Penetrating Radar (GPR)
Theme_Keyword: subsurface profile
Theme_Keyword: Global Positioning System (GPS)
Theme_Keyword: trackline
Theme_Keyword: Environmental Systems Research Institute (Esri)
Theme_Keyword: Keyhole Markup Language (KML)
Theme_Keyword: Barrier Island Mapping
Theme_Keyword: 13BIM01
Theme_Keyword: location

Place:

Place_Keyword_Thesaurus: None
Place_Keyword: United States of America
Place_Keyword: Alabama
Place_Keyword: Dauphin Island
Place_Keyword: Mobile Bay
Place_Keyword: Mississippi Sound
Place_Keyword: Gulf of Mexico

Access_Constraints: None. Please see “Distribution Information” for details.
Use_Constraints:

Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. The U.S. Geological Survey requests to be acknowledged as originators of the data in future products or derivative research. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey, Southeast Region
Contact_Person: Arnell S Forde

Contact_Position: Geologist
Contact_Address:

Address_Type: Mailing and Physical
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701

Contact_Voice_Telephone: 727-502-8111
Contact_Facsimile_Telephone: 727-502-8001
Contact_Electronic_Mail_Address: aforde@usgs.gov

Native_Data_Set_Environment:

Environment as of Metadata Creation: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.2.2 (Build 3552) Service Pack N/A (Build N/A)

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report: No formal attribute accuracy tests were conducted.

Logical_Consistency_Report: No formal logical accuracy tests were conducted.
Completeness_Report:

A total of 65 GPR lines, representing a linear distance of approximately 40 kilometers (km), were acquired during field activity 13BIM01. Due to acquisition errors encountered during the collection of lines 87 (missing GPS information) and 101 (incomplete data file), those files were not processed. No data were collected for lines 112, 113 and 114.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Location information associated with each GPR line was determined by post-processed differential correction using a base/rover setup. The field setup consisted of two (rover and base station) Ashtech ProFlex Global Navigation Satellite System (GNSS) receivers and antennas. The GNSS base and rover receivers recorded the raw full-carrier-phase positioning signals (L1/L2) from satellites, via Ashtech GNSS antenna, concurrently at 0.2 seconds (s) (5 Hertz [Hz]) intervals throughout the survey. The base station receiver was positioned on the National Geodetic Survey (NGS) published reference point NGS PID# BH1755 (Station ID: 8735180), located on the east side of the island, at the entrance to Fort Gaines. The vertical offset between the GNSS antenna and the NGS benchmark was 2.476 m. The rover GPS was mounted on a fixed frame above the GPR unit. The offset between the rover GNSS antenna (located on the GPR unit) and the ground was 1.915 meters (m). Raw, uncorrected position data were output from the rover GPS to the GPR as a National Marine Electronics Association (NMEA) GGA string.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

During acquisition of lines 66-116, the signal between the GPS rover unit and multiple satellites was interrupted or lost, most likely due to dense tree canopy within the survey area. This lack of communication with the satellites caused either incorrect values, missing, or incomplete GPS data to be collected and recorded. For lines missing post-processed GPS and (or) elevation data, elevation and location data were extracted from a topographic lidar survey, which was contracted by the USGS in July 2013 (Guy and Plant, 2013), and this data used instead. In cases where the DGPS data were incomplete or corrupted and lidar data were unavailable, non-elevation corrected profiles have been provided. Lines 65, 120, 121 and 122 were all processed using lidar-extracted location and elevation information. Lines 66-70, 74-82, 88, 92-94, 98, 100, 102, 109-116 and 124 have non-elevation corrected profile images associated with each line.

Lineage:

Process_Step:

Process_Description:

GPR processing: The GPR data were processed using Sandmeier Scientific Software’s Reflexw Version 7.2.2 geophysical near surface processing and interpretation software (http://www.sandmeier-geo.de/reflexw.html). Each GPR data file was imported into Reflexw, where it was converted from Radan’s DZT (.dzt) format to a .dat file. Processing steps utilized during post processing included applying static correction, subtracting mean (dewow), removing header gain, and applying manual Automatic Gain Control (AGC) gain. After these initial processing steps, the position (either post-processed DGPS or lidar-derived coordinates) and elevation data were integrated into the trace headers. Lastly, all profiles were inspected for data quality to ensure no navigation or trace data gaps were present before being output in American Standard Code for Information Interchange (ASCII) format for the trace data and JPEG format for the profile images. If any issues were discovered during the QA/QC process, this information was noted for each affected line and recorded in this metadata file. A velocity of 0.06 m/ns was used to display depths on the elevation-corrected profiles.

Process_Date: 20130801

Process_Step:

Process_Description:

Navigation processing: During acquisition, uncorrected real-time rover positions were output as a NMEA GGA string at a 9600 baud rate to an external GPS Acumen data logger [puck] and saved as a .plt file. A Matlab script written by Christopher G. Smith was used to extract the line name, time, latitude, and longitude from each GPR line's .plt file and this information was then saved as a comma separated value (CSV) file. Each .csv file was subsequently imported into ArcGIS 10.2 and saved as an individual point shapefile. Once a point shape file had been created for all the GPR lines, the PointsToLine script (located in the ArcToolbox) was used to create individual polyline files for each trackline. The last step involved combining each polyline file into a single shapefile, called 13BIM01_trklns2.shp, using the Arc Toolbox Append tool. In order to use ArcMap’s hyperlink feature to display each line's associated profile image, a field called "Image" was added to the final shapefile’s attribute table. Please note that the “images” folder and map document, included in pubs.usgs.gov/ds/0982/downloads/13BIM01_gis_data.zip, must both be located in the same directory or the hyperlink function will not work.

Process_Date: 20140422

Process_Step:

Process_Description:

Added keywords section with USGS persistent identifier as theme keyword.

Process_Date: 20201013
Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross

Contact_Position: Marine Geologist
Contact_Address:

Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598

Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 60

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.0197877137
Longitude_Resolution: 0.0227813369
Geographic_Coordinate_Units: Decimal seconds

Geodetic_Model:

Horizontal_Datum_Name: D_WGS_1984
Ellipsoid_Name: WGS_1984
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257223563

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: 13BIM01_trklns2.shp
Entity_Type_Definition:

Geospatial data representation showing the locations of all the GPR trickling collected during FAN 13BIM01.

Entity_Type_Definition_Source: Producer defined

Attribute:

Attribute_Label: Id
Attribute_Definition:

Short form of the sequential line numbers (063-0128) assigned by the GPR acquisition system, during data collection.

Attribute_Definition_Source: USGS
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 63
Range_Domain_Maximum: 128

Attribute:

Attribute_Label: Image
Attribute_Definition: Joint Photographic Experts Group (JPEG) Image Name
Attribute_Definition_Source: USGS
Attribute_Domain_Values:

Unrepresentable_Domain:

This field lists the name of the subsurface profile image, in .jpg format, which was created from the post-processed GPR trace data. Each image is associated with the relevant GPR trackline using the hyperlink feature in ArcMap. Some lines were missing post-processed GPS and (or) elevation data so no elevation corrections were applied to these lines; consequently, these lines have "_noelev" appended after the line number.

Overview_Description:

Entity_and_Attribute_Overview:

The entity and attribute information provided here describes the tabular data associated with the dataset. Please review the detailed descriptions that are provided (the individual attribute descriptions) for information on the values that appear as fields/table entries of the dataset.

Entity_and_Attribute_Detail_Citation:

The entity and attribute information was generated by the individual and (or) agency identified as the originator of the dataset. Please review the rest of the metadata record for additional details and information.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey, Southeast Region
Contact_Person: Arnell S Forde

Contact_Position: Geologist
Contact_Address:

Address_Type: Mailing and Physical
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701

Contact_Voice_Telephone: 727-502-8111
Contact_Facsimile_Telephone: 727-502-8001
Contact_Electronic_Mail_Address: aforde@usgs.gov

Distribution_Liability:

This publication was prepared by an agency of the United States Government. Although these data were processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: Compressed (zip) archive
Format_Version_Date: 2015
Format_Specification: Vector digital data, tabular digital data, raster data
Format_Information_Content:

This zip archive includes the geographic trackline locations in .shp and .kml formats for GPR data collected from Dauphin Island, Alabama in 2013.

File_Decompression_Technique: Unzip
Transfer_Size: 10.3

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: https://pubs.usgs.gov/ds/0982/downloads/13BIM01_gis_data.zip

Fees: None. No fees are applicable for obtaining the dataset.

Metadata_Reference_Information:

Metadata_Date: 20201013
Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Arnell S Forde
Contact_Organization: U.S. Geological Survey, Southeast Region

Contact_Position: Geologist
Contact_Address:

Address_Type: Mailing and Physical
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701

Contact_Voice_Telephone: 727-502-8111
Contact_Facsimile_Telephone: 727-502-8001
Contact_Electronic_Mail_Address: aforde@usgs.gov

Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/13BIM01_gis_metadata.html>