Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 2015 Title: Shot point navigation at even 500 shot intervals for 512i seismic-reflection data collected by the U.S. Geological Survey along the Delmarva Peninsula, MD and VA, 2014 (Esri polyline shapefile, GCS WGS 84) Edition: 1.0 Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/F7MW2F60 Publication_Information: Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: https://doi.org/10.5066/F7MW2F60 Online_Linkage: https://cmgds.marine.usgs.gov/data/field-activity-data/2014-002-FA/data/seismics/tracks/2014-002-FA_512shots.zip Larger_Work_Citation: Citation_Information: Originator: Elizabeth A. Pendleton Originator: S.D. Ackerman Originator: W.E. Baldwin Originator: W.W. Danforth Originator: D.S. Foster Originator: E.R. Thieler Originator: L.L. Brothers Publication_Date: 2015 Title: High-resolution geophysical data collected along the Delmarva Peninsula 2014, U.S. Geological Survey Field Activity 2014-002-FA Edition: 2.0 Geospatial_Data_Presentation_Form: view Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/F7MW2F60 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.5066/F7MW2F60 Description: Abstract: The Delmarva Peninsula is a 220-kilometer-long headland, spit, and barrier island complex that was significantly affected by Hurricane Sandy. A U.S. Geological Survey cruise was conducted in the summer of 2014 to map the inner continental shelf of the Delmarva Peninsula using geophysical and sampling techniques to define the geologic framework that governs coastal system evolution at storm-event and longer timescales. Data collected during the 2014 cruise include swath bathymetry, sidescan sonar, chirp and boomer seismic-reflection profiles, acoustic Doppler current profiler, and sample and bottom photograph data. Processed data in raster and vector format are released here for the swath bathymetry, sidescan sonar, and seismic-reflection profiles. More information about the USGS survey conducted as part of the Hurricane Sandy Response-- Geologic Framework and Coastal Vulnerability Study can be found at the project website or on the WHCMSC Field Activity Web pages: https://woodshole.er.usgs.gov/project-pages/delmarva/ and https://cmgds.marine.usgs.gov/fan_info.php?fan=2014-002-FA Purpose: This dataset contains 500 shotpoint navigation and unique shotpoint navigation for approximately 4500 km of Edgetech SB-512i chirp seismic-reflection data collected by the U.S. Geological Survey during cruise 2014-002-FA along the Delmarva Peninsula, MD and VA. This information can help spatially correlate the seismic-reflection profiles with other data in the GIS. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20140618 Ending_Date: 20140722 Currentness_Reference: ground condition; data were not collected on 20140702-20140704; 20140709; and 20140714-20140715 due to weather. Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -75.567695 East_Bounding_Coordinate: -74.687529 North_Bounding_Coordinate: 38.430403 South_Bounding_Coordinate: 37.538209 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Woods Hole Coastal and Marine Science Center Theme_Keyword: WHCMSC Theme_Keyword: Coastal and Marine Geology Program Theme_Keyword: CMGP Theme_Keyword: seismic profile Theme_Keyword: trackline navigation Theme_Keyword: seismic navigation Theme_Keyword: seismic reflection Theme_Keyword: WHCMSC field activity serial number 2014-002-FA Theme_Keyword: M/V Scarlett Isabella Theme_Keyword: chirp Theme_Keyword: 512i Theme_Keyword: Esri shapefile Theme_Keyword: shot point Theme_Keyword: EdgeTech SB-512i Sub-bottom Profiler Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: location Theme_Keyword: oceans Theme_Keyword: geoscientificInformation Place: Place_Keyword_Thesaurus: None Place_Keyword: North America Place_Keyword: Atlantic Ocean Place_Keyword: United States Place_Keyword: Maryland Place_Keyword: Delaware Place_Keyword: Virginia Place_Keyword: Assateague Island Place_Keyword: Ocean City Place_Keyword: Wallops Island Place_Keyword: Parramore Island Place_Keyword: Chincoteague Island Place_Keyword: Chincoteague Bay Place_Keyword: Delaware Bay Place_Keyword: Assateague Island National Seashore Place_Keyword: Chincoteague National Wildlife Refuge Place_Keyword: Isle of Wight Bay Place_Keyword: Fenwick Island Place_Keyword: Assawoman Bay Place_Keyword: Cape Henlopen Place_Keyword: Rehoboth Beach Place_Keyword: Delaware Seashore State Park Place_Keyword: Bethany Beach Place_Keyword: Toms Cove Place_Keyword: Berlin Access_Constraints: None Use_Constraints: 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: Elizabeth A. Pendleton Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2259 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: ependleton@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: https://cmgds.marine.usgs.gov/data/field-activity-data/2014-002-FA/data/seismics/tracks/512_shots.png Browse_Graphic_File_Description: Woods Hole Coastal and Marine Science Center 512i shotpoints at 500-interval along the Delmarva Peninsula Browse_Graphic_File_Type: PNG Native_Data_Set_Environment: Microsoft Windows 7 Enterprise Service Pack 1; ArcGIS Desktop 9.3 Service Pack 1; Build 1850 Data_Quality_Information: Logical_Consistency_Report: Any spurious data points were removed during processing. For each seismic trackline there is a starting shot point (1) and ending shot point (x) with even 500-shot intervals in the shapefile. The CSV file contains unique shot point navigation. No duplicate shots exist. Completeness_Report: Not all turns and transits acquired seismic data and therefore were omitted from the trackline and shot point navigation files. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Differential Global Positioning System (DGPS) navigation data were acquired with a Hemisphere receiver and recorded with HYPACK (www.hypack.com). The DGPS antenna was located on the port-side of the acquisition van. The SB-0512i was mounted on a catamaran sled and towed at the sea surface approximately 43 m astern of the M/V Scarlett Isabella. Fish depth below water line was 0.5 meters below catamaran floats. The GPS offset from sheave was x = 8.75 m; y = -43 m; z = 0. Navigation data were sent to SonarWiz (version 5) acquisition application and offsets were recorded in the acquisitions software, which logged the coordinates to individual trace headers SEG-Y and JSF format. Positional accuracy is assumed to be better than 10 m and is primarily related to changes in cable-out related to fish and sled motion behind the boat. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 2015 Title: 512i navigation Geospatial_Data_Presentation_Form: vector digital data Type_of_Source_Media: disc Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20140618 Ending_Date: 20140722 Source_Currentness_Reference: ground condition; data were not collected on 20140702-20140704; 20140709; and 20140714-20140715 due to weather. Source_Citation_Abbreviation: SEG-Y and JSF 512i data Source_Contribution: Chirp seismic data were collected using an EdgeTech Geo-Star FSSB sub-bottom profiling system and an SB-0512i towfish (0.5-12 kHz), which was mounted on a catamaran and towed astern of the M/V Scarlett Isabella of Cape May, NJ. Chesapeake Technologies' SonarWiz (v.5.00.0015) seismic acquisition software was used to control the Geo-Star topside unit, digitally log trace data in the SEG-Y Rev. 1 format (IEEE floating point) and JSF format, and record GPS navigation coordinates to the SEG-Y trace headers (in arc seconds of Latitude and Longitude, multiplied by a scalar of 100). Data were acquired using a 250 ms shot rate, a 5-ms pulse length, and a 0.5 to 8 kHz frequency sweep. Recorded trace lengths were approximately 180 ms. Process_Step: Process_Description: Scripts within SIOSEIS (version 2010.2.25) and Seismic Unix (version 4.2) were used to process SEG-Y data, create navigation files, and plot images. The processing flow and scripts used to produce layback corrected navigation files including trackline shapefiles and shotpoints are summarized below and in the following processing steps. 1. SIOSEIS (version 2010.2.25) was used to read SEG-Y files, renumber shots starting from one, and write out new SEG-Y files. The original shot numbers, which were assigned by SonarWiz sequentially over the duration of an acquisition session despite SEG-Y file changes, are preserved in the raw SEG-Y data. 2. Sio_medianstk was used to remove S-boom cross talk (when multi-channel streamer lines were recorded simultaneously: Julian Day 169-178) with a two-trace median stack and improve water bottom picking. This script was used for all lines even after multi-channel streamer was turned off, due to the improvements made to water bottom picks. 3. Read512i_mstk was used to read median filtered stacked and renumbered SEG-Y files, write a Seismic Unix file, and extract SEG-Y trace header information, including shot number, longitude, latitude, year, Julian day, and time of day (UTC). Header information from each SEG-Y file was saved to text files after an AWK (no version) filter was used to maintain the first and last shots, shots at multiples of 100, and shots with unique navigation coordinates. Geographic coordinates (WGS84) were converted to UTM zone 18 coordinates (WGS84) using Proj (version 4.6.0). End shots and shots at multiples of 100 may not have unique navigation coordinates. Separate text files containing the first and last shots and even 500 shot intervals were also saved. A 500 shot interval was chosen because it corresponds to the annotation interval provided along the top of the seismic-reflection profile images, which are included in the folders within 'seismics\512images'. Process_Date: 2014 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Dave Foster Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700x2271 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: dfoster@usgs.gov Process_Step: Process_Description: A Python (version 2.7) script was used to apply layback to seismic navigation acquired during the 2014-002-FA survey. Attributes oldEast and oldNorth in the table ‘2014_002_512i_lbunique.csv', which is included in the zip compressed version of this shapefile ‘2014-002-FA_512i_500sht.shp', document pre-layback shot/trace positions. Using Easting and Northing coordinates (UTM Zone 18 N, WGS84) from the trace headers, the script calculated easting and northing differential values between consecutive trace positions. Headings between consecutive traces were calculated using the arctangent function (arctan2(dy,dx)), and reciprocal back bearings were determined using a lookup table. Back bearings were smoothed along track using a moving median function with a window length defined by the user (59 traces during 2014-002-FA ). Layback easting and northing offsets were calculated by multiplying the linear distance between the catamaran and the shipboard DGPS receiver (33 for line 1 or 43 m for all other lines during 2014-002-FA) by the sine and cosine of the smoothed back bearing, respectively. Offset values were then added to the original coordinates to produce layback positions. Process_Date: 2014 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Dave Foster Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700x2271 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: dfoster@usgs.gov Process_Step: Process_Description: An awk (do_nav_gisprep) script was used to process layback unique, 100 shot, and 500 shot corrected navigation to a merged csv file that can be utilized by ArcGIS to create a trackline and shotpoint shapefile. The merged 500-shot point navigation CSV was imported into ArcMap (version 10.2.2) using 'Add XY data' and saved as points (Geographic, WGS84) in the Esri shapefile format. Fields were added for Survey ID, Device ID, and Vehicle ID within ArcMap. The unique shot point CSV file was not modified after all the lines were merged during layback correction. Process_Date: 2014 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Wayne Baldwin Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700 x2226 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: wbaldwin@usgs.gov Process_Step: Process_Description: The online links to the data were updated to reflect the new server hosting the data. Additionally, other small edits could be made to the metadata, such as modifying http to https where appropriate. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. Process_Date: 20170419 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: Point Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Entity point Point_and_Vector_Object_Count: 9882 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: 2014_002_FA_512i_500sht Entity_Type_Definition: 512i 500 interval shot points for survey 2014-002-FA along the Delmarva Peninsula Entity_Type_Definition_Source: U.S. Geological Survey 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: East Attribute_Definition: Easting coordinate in UTM Zone 18 meters, WGS 84 Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 449880.7 Range_Domain_Maximum: 527500.22 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: .01 Attribute: Attribute_Label: North Attribute_Definition: Northing coordinate in UTM Zone 18 meters, WGS 84 Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 4154602.47 Range_Domain_Maximum: 4253571.17 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: .01 Attribute: Attribute_Label: Long Attribute_Definition: Longitude coordinate in decimal degrees, WGS 84 Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -75.567695 Range_Domain_Maximum: -74.685191 Attribute_Units_of_Measure: degrees Attribute_Measurement_Resolution: .000001 Attribute: Attribute_Label: Lat Attribute_Definition: Latitude coordinate in decimal degrees, WGS 84 Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 37.538209 Range_Domain_Maximum: 38.430403 Attribute_Units_of_Measure: degrees Attribute_Measurement_Resolution: .000001 Attribute: Attribute_Label: FileName Attribute_Definition: Name of seismic data file Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Sequential numbered names used to distinguish seismic lines Attribute: Attribute_Label: Image Attribute_Definition: Name of seismic profile PNG image Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Sequential numbered names used to distinguish seismic PNG files Attribute: Attribute_Label: Shot Attribute_Definition: Shot number (first, last, and every 500 shot between) Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 40509 Attribute_Units_of_Measure: shot Attribute_Measurement_Resolution: 1 Attribute: Attribute_Label: Year Attribute_Definition: Calendar year data were collected Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2014 Range_Domain_Maximum: 2014 Attribute_Units_of_Measure: year Attribute_Measurement_Resolution: 1 Attribute: Attribute_Label: Time_UTC Attribute_Definition: Julian Day (JD) and UTC time of data collection in format JD: HH:MM:SS. (Julian day is the integer number representing the interval of time in days since January 1 of the year) Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: String up to 254 characters Attribute: Attribute_Label: Survey_ID Attribute_Definition: WHCMSC field activity identifier (e.g. "2014-002-FA" where 2014 is the survey year, 002 is survey number of that year, and FA is Field Activity) Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: String up to 254 characters Attribute: Attribute_Label: Vehicle_ID Attribute_Definition: Survey vessel name Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: String up to 254 characters Attribute: Attribute_Label: Device_ID Attribute_Definition: Device used to collect seismic-reflection data Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: String up to 254 characters Overview_Description: Entity_and_Attribute_Overview: The PNG seismic reflection images can be hyperlinked to their trackline location in ArcGIS. The 500 shot point intervals correspond to the x-axis ticks on the PNG images. The unique shot CSV file has the following column headings: East, North, Long, Lat FileName, Image, Shot, Year, Time_UTC, OldEast, OldNorth. The first 9 columns correspond to the first 9 attributes of the shapefile. OldEast and OldNorth document pre-layback shot/trace positions in eastings and northings. Entity_and_Attribute_Detail_Citation: U.S. Geological Survey Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Elizabeth A. Pendleton Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700x2259 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: ependleton@usgs.gov Resource_Description: USGS data release 2014-002-FA 512i shots from the Delmarva Peninsula area (2014-002-FA_512shots.zip). The zip file contains a folder with the following a shapefile with 500-shot point interval locations (2014_002_FA_512i_500sht.shp). A browse graphic (512_shots.png), as CSV file with unique shots (2014_002_512i_lbunique.csv) and FGDC CSDGM metadata files (2014_002_FA_512i_500sht.xml) in four standard formats are also included in the zip file. 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 10.2.2 Format_Specification: Shapefile Format_Information_Content: WinZip (v 14.5) file containsa shapefile of 512i 500-interval shot points and a CSV file of the unique shot navigation collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center along the Delmarva Peninsula, MD and VA and the associated metadata. File_Decompression_Technique: use WinZip or pkUnzip Transfer_Size: 52 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://cmgds.marine.usgs.gov/data/field-activity-data/2014-002-FA/data/seismics/tracks/2014-002-FA_512shots.zip Network_Resource_Name: https://cmgds.marine.usgs.gov/data/field-activity-data/2014-002-FA/ Network_Resource_Name: https://doi.org/10.5066/F7MW2F60 Access_Instructions: Data can be downloaded via the World Wide Web (WWW) Digital_Form: Digital_Transfer_Information: Format_Name: Comma Seperated Values (CSV) Format_Version_Number: Excel Version 2010 Format_Specification: Comma Seperated Values (CSV) Format_Information_Content: WinZip (v 14.5) file containsa shapefile of 512i 500-interval shot points and a CSV file of the unique shot navigation collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center along the Delmarva Peninsula, MD and VA and the associated metadata. File_Decompression_Technique: use WinZip or pkUnzip Transfer_Size: 52 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://cmgds.marine.usgs.gov/data/field-activity-data/2014-002-FA/data/seismics/tracks/2014-002-FA_512shots.zip Network_Resource_Name: https://cmgds.marine.usgs.gov/data/field-activity-data/2014-002-FA/ Network_Resource_Name: https://doi.org/10.5066/F7MW2F60 Access_Instructions: Data can be downloaded via the World Wide Web (WWW) Fees: none Technical_Prerequisites: This zip file contains data available in shapefile format. The user must have software capable of reading and processing the data file. The CSV file can be opened with any text editor Metadata_Reference_Information: Metadata_Date: 20170419 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Elizabeth Pendleton Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700x2259 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: ependleton@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_Access_Constraints: None Metadata_Use_Constraints: None