Metadata: Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Originator: Coastal and Marine Geology Program Publication_Date: 2013 Title: a194gb.m77t and a194gb.h77t: MGD77T data and header files for single-beam bathymetry data for field activity A-1-94-GB in Prince William Sound, Yakutat Bay, Glacier Bay and Icy Strait, Alaska from 08/08/1994 to 08/17/1994 Geospatial_Data_Presentation_Form: tab-delimited ASCII text files Publication_Information: Publication_Place: St. Petersburg, FL Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/ds/757/a194gb.m77t Larger_Work_Citation: Citation_Information: Originator: Heather A. Schreppel Originator: Carolyn H. Degnan Originator: Dan R. Metzger Originator: Shawn V. Dadisman Publication_Date: 2013 Title: Archive of U.S. Geological Survey selected single-beam bathymetry datasets, 1969-2000 Edition: 1.0 Geospatial_Data_Presentation_Form: Digital Document Series_Information: Series_Name: U.S. Geological Survey Data Series Issue_Identification: 757 Publication_Information: Publication_Place: St. Petersburg, FL Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/ds/757 Description: Abstract: Single-beam bathymetry data along with GPS navigation data was collected as part of the U.S. Geological Survey cruise A-1-94-GB. The cruise was conducted in Prince William Sound, Yakutat Bay, Glacier Bay and Icy Strait, Alaska from August 8 to August 17, 1994. The chief scientists were Paul Carlson and Rob Kayen from the USGS Coastal and Marine Geology office in Menlo Park, CA, Ellen Cowan (Appalachian State University), and Ross Powell (Northern Illinois University). The overall purpose of this study was to study high resolution seismic facies to interpret glacial fluctuations in Gulf of Alaska region. The geophysical source was a 12 kilohertz (kHz) bathymetry echosounder. These data are reformatted from space-delimited ASCII text files located in the Coastal and Marine Geology Program (CMGP) InfoBank field activity catalog at http://walrus.wr.usgs.gov/infobank/a/a194gb/html/a-1-94-gb.sc.meta.html into MGD77T format provided by the NOAA's National Geophysical Data Center(NGDC). The MGD77T format includes a header (documentation) file (.h77t) and a data file (.m77t). More information regarding this format can be found in the publication listed in the Cross_reference section of this metadata file. Purpose: These data and information are intended for science researchers,students, policy makers, and general public. These data are not to be used for navigation purposes. The data are reformatted into MGD77T standard format for inclusion into NOAA's NGDC geophysical database. From there the data will be made available to GeoMapApp (http://www.geomapapp.org/) and Virtual Ocean (http://www.virtualocean.org/) Earth-browsing software. Access to the data is also provided via the USGS Coastal and Marine Geoscience Data System (http://cmgds.marine.usgs.gov/). Supplemental_Information: The navigation data are digitally collected using a Global Positioning System (GPS). The GPS is a space-based satellite navigation system maintained by the United States government and is accessible using a GPS receiver. Data accuracy is based on individual receiver models, and most GPS data are collected in the WGS84 horizontal datum. The Data Acquisition, Processing, and Storage (DAPS) group performs a number of processing steps to the navigation data once it is collected which can vary by cruise. These steps are outlined within the header information in each individual digital navigation (.0xx, .6xx) space-delimited ASCII data file. The header information rows are indicated by lines beginning with the character "!". The single-beam bathymetry data was collected both digitally and as analog records with a 12 kHz echo sounder. The bathymetry datasets were commonly processed using three programs: (A) Batred, which calculates depth from travel times; (B) nosamebathy, which eliminates identical adjacent bathymetry values; and (C) nozerobathy, which removes records with a depth value of "0.0". However, not all of the datasets included in this report were processed with one or more of these programs. If the data was not run through these programs it was reformatted using the most recent "best file" on InfoBank, often these were categorized by InfoBank as raw bathymetry files. Details about which processing steps were taken by the DAPS group can be found in the header information of the bathymetry and navigation ASCII files downloaded from InfoBank. Prior to reformatting the data into MGD77T format the "best" bathymetry and navigation files from InfoBank were edited to remove the header information and reformatted using Excel 2010 to separate the data into columns based on tabs. Next the bathymetry and navigation files were merged based on time and latitude and longitude. The combined navigation and bathymetry was saved as a .txt file. This combined bathymetry and navigation file was used as an input file into the GEODAS ReFormat to MDG77T program developed by NOAA's NGDC. The program outputs the reformatted data as a tab-delimited .m77t file. The program is available for use at: http://www.ngdc.noaa.gov/mgg/gdas/gx_announce.Html. For information regarding fields found within the MGD77T files please refer to the publication, Hittelman and others (2010), found within the Cross-reference section of this metadata file. Each MGD77T data file also has an accompanying header file (.h77t). The fields within these header files are also defined in the aforementioned publication. Fields were populated based on InfoBank metadata records, digital data file headers, and accompanying publications (often cruise reports) for the survey. If a field is unknown or did not apply to the dataset it is intentionally left blank. During cruise A-1-94-GB, no data is available from the last two days of the cruise, August 16 and August 17, 1994. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 19940808 Ending_Date: 19940817 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -138.99933 East_Bounding_Coordinate: -135.46049 North_Bounding_Coordinate: 59.08550 South_Bounding_Coordinate: 58.10867 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificinformation Theme_Keyword: oceans Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Marine Geology Theme_Keyword: Marine Geophysics Theme_Keyword: Single-beam Bathymetry Theme_Keyword: Water Depth Theme_Keyword: Seafloor Topography Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: Gulf of Alaska Place_Keyword: Glacier Bay Place_Keyword: Prince William Sound Place_Keyword: Yakutat Bay Place_Keyword: Icy Strait Place_Keyword: State of Alaska Access_Constraints: None. These data are held in the public domain. Use_Constraints: This information is not intended for navigational purposes. Read and fully comprehend the metadata prior to data use. Uses of these data should not violate the spatial resolution of the data. Where these data are used in combination with other data of different resolution, the resolution of the combined output will be limited by the lowest resolution of all the data. Acknowledge the U.S. Geological Survey in products derived from these data. Share data products developed using these data with the U.S. Geological Survey. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Heather A. Schreppel Contact_Organization: Cherokee Nation Technology Solutions, contracted to U.S. Geological Survey Contact_Position: IT Management Specialist/Database Support Assistant Contact_Address: Address_Type: mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: (727) 803-8747, ext. 3013 Contact_Electronic_Mail_Address: hschreppel@usgs.gov Data_Set_Credit: Ellen Cowan (Chief Scientist, Appalachian State University); Ross Powell (Chief Scientist, Northern Illinois University); Paul Carlson (Chief Scientist, USGS Western Region); Rob Kayen (Chief Scientist, USGS Western Region); Cross_Reference: Citation_Information: Originator: Hittelman, Allen M., Groman, Robert C., Haworth, Richard T., Holcombe, Troy L., McHendrie, Graig, Smith, Stuart M., and Metzger, Dan R. Publication_Date: 2010 Title: The marine geophysical data exchange format - MGD77 / MGD77T Publication_Information: Publisher: National Geophysical Data Center, National Oceanic and Atmospheric Administration Publication_Place: Boulder, CO Other_Citation_Details: 25 p. Online_Linkage: http://www.ngdc.noaa.gov/mgg/dat/geodas/docs/mgd77.pdf Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The validity or accuracy of bathymetry and navigation data is highly qualitative and depends on equipment and operating condition variables. Data quality is unknown, MGD77T files were formatted from InfoBank files identified as best available version. Logical_Consistency_Report: This data set is from one field activity with unknown instrument calibrations. Processed bathymetric depths were spot checked based on latitude and longitude against the Global Multi-Resolution Topography (GMRT) grid within GeoMapApp to ensure reasonable values. Completeness_Report: Start and end date/times of data according to DAPS group. Reasons for gaps in data varies by cruise, see InfoBank for more details. >Navigation Data (a-1-94-gb.065 [GPS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >199408081714100 199408121734080 >199408121757540 199408121800270 >199408121825280 199408151039000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (a-1-94-gb.300_065) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >199408092117000 199408092240000 >199408092330000 199408100125000 >199408100206000 199408100232000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Unspecified Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Unspecified Lineage: Process_Step: Process_Description: Below are the details about which processing steps were taken by the DAPS group that can be found in the header information of the ASCII files downloaded from InfoBank. Navigation Data >Converted to time format with year at start. > Process_Date: 19951205 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG) Contact_Person: Carolyn H. Degnan Contact_Position: Geophysicist Contact_Address: Address_Type: mailing and physical address Address: USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive City: Santa Cruz State_or_Province: CA Postal_Code: 95060-5792 Country: USA Contact_Voice_Telephone: (831) 460-7452 Contact_Facsimile_Telephone: (831) 427-4748 Contact_Electronic_Mail_Address: infobank@octopus.wr.usgs.gov Process_Step: Process_Description: Below are the details about which processing steps were taken by the DAPS group that can be found in the header information of the ASCII files downloaded from InfoBank. Bathymetry Data >10/31/1998 /lion/a/a194gb/bath/a-1-94-gb.300_065 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >03/16/95 CLINT MOG$DUB1:[ARCHIVE.A.A194GB.BATH]A194GB.300;1 >MOG$DUB0:[PROGRAMS.REFMT]REFORMAT.EXE; >Raw depth (bathymetry) data >Depths were picked from fathometer lines GB1, GB2, & GB3 >from AH94 in upper Muir Inlet. Data sent to Paul Carlson >on 2/24/95, by Ellen Cowan, (704) 262-3049, >Appalachian State Univ, Col of Arts & Sciences, >Dept of Geol, Boone, NC 28608. > >Input was... >Converted to time format with year at start. > >time, lat, long, time(sec) to nearest nav fix, data values Process_Date: 19981031 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG) Contact_Person: Carolyn H. Degnan Contact_Position: Geophysicist Contact_Address: Address_Type: mailing and physical address Address: USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive City: Santa Cruz State_or_Province: CA Postal_Code: 95060-5792 Country: USA Contact_Voice_Telephone: (831) 460-7452 Contact_Facsimile_Telephone: (831) 427-4748 Contact_Electronic_Mail_Address: infobank@octopus.wr.usgs.gov Process_Step: Process_Description: A navigation file identified as the best available version in InfoBank for this cruise was copied and saved as an ASCII text file to be combined with the best available bathymetry file for processing to MGD77T format. For details regarding processing steps performed on these best available files from InfoBank, please see the header information within the original files at http://walrus.wr.usgs.gov/infobank/ and previous processing steps. Source_Used_Citation_Abbreviation: a-1-94-gb.065.txt Process_Date: 2012 Source_Produced_Citation_Abbreviation: a194gbnav.txt Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey Contact_Person: Heather A. Schreppel Contact_Position: IT Management Specialist/Database Support Assistant Contact_Address: Address_Type: mailing and physical address Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727-803-8747 ext. 3013 Contact_Electronic_Mail_Address: hschreppel@usgs.gov Process_Step: Process_Description: A bathymetry file identified as the best available version in InfoBank for this cruise was copied and saved as an ASCII text file to be combined with the best available navigation file for processing to MGD77T format. For details regarding processing steps performed on these best available files from InfoBank, please see the header information within the original files at http://walrus.wr.usgs.gov/infobank/. Source_Used_Citation_Abbreviation: a-1-94-gb.300_065.txt Process_Date: 2012 Source_Produced_Citation_Abbreviation: a194gbbathy.txt Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey Contact_Person: Heather A. Schreppel Contact_Position: IT Management Specialist/Database Support Assistant Contact_Address: Address_Type: mailing and physical address Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727-803-8747 ext. 3013 Contact_Electronic_Mail_Address: hschreppel@usgs.gov Process_Step: Process_Description: The best available bathymetry and navigation text files were concatenated into one tab-delimited file using Excel 2010 and several Visual Basic Applications (VBA) macros. InfoBank header information is removed and text is broken into columns and the rows are combined based on the presence of the same values in the time and latitude and longitude columns. Source_Used_Citation_Abbreviation: a194gbnav.txt, a194gbbathy.txt Process_Date: 2012 Source_Produced_Citation_Abbreviation: a194gball.txt Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey Contact_Person: Heather A. Schreppel Contact_Position: IT Management Specialist/Database Support Assistant Contact_Address: Address_Type: mailing and physical address Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727-803-8747 ext. 3013 Contact_Electronic_Mail_Address: hschreppel@usgs.gov Process_Step: Process_Description: The combined bathymetry and navigation file was used as an input file into the GEODAS ReFormat to MDG77T program developed by NOAA's NGDC. The program outputs the reformatted data as a tab-delimited .m77t file. The program is available for use at: http://www.ngdc.noaa.gov/mgg/gdas/gx_announce.Html Source_Used_Citation_Abbreviation: a194gball.txt Process_Date: 2012 Source_Produced_Citation_Abbreviation: a194gb.m77t Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey Contact_Person: Heather A. Schreppel Contact_Position: IT Management Specialist/Database Support Assistant Contact_Address: Address_Type: mailing and physical address Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727-803-8747 ext. 3013 Contact_Electronic_Mail_Address: hschreppel@usgs.gov Process_Step: Process_Description: To create the accompanying header files (.h77t), an excel spreadsheet was supplied from NGDC with already populated required field names. For information for header field requirements and definitions see: http://www.ngdc.noaa.gov/mgg/dat/geodas/docs/mgd77.pdf. When creating a header file for each cruise, fields were populated in the header spreadsheet based on InfoBank metadata records, digital data file headers, and accompanying publications (often cruise reports) for the survey. If a field was unknown or did not apply to the dataset it was intentionally left blank. Source_Used_Citation_Abbreviation: http://walrus.wr.usgs.gov/infobank/a/a194gb/html/a-1-94-gb.fmeta.indent.html Process_Date: 2012 Source_Produced_Citation_Abbreviation: a194gb.h77t Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey Contact_Person: Heather A. Schreppel Contact_Position: IT Management Specialist/Database Support Assistant Contact_Address: Address_Type: mailing and physical address Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727-803-8747 ext. 3013 Contact_Electronic_Mail_Address: hschreppel@usgs.gov Spatial_Data_Organization_Information: Indirect_Spatial_Reference: Prince William Sound, Yakutat Bay, Glacier Bay and Icy Strait, Alaska from 08/08/1994 to 08/17/1994 Direct_Spatial_Reference_Method: Point Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point 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: 298.25722210100002 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: a194gb.m77t Entity_Type_Definition: MGD77T single-beam bathymetry data file for A194GB Entity_Type_Definition_Source: NOAA's National Geophysical Data Center, See Hittelman and others (2010) Cross_Reference section above for details about the MGD77T format and citation information. Attribute: Attribute_Label: SURVEY_ID Attribute_Definition: Survey identifier supplied by the contributing organization Attribute_Definition_Source: NGDC Attribute_Domain_Values: Unrepresentable_Domain: This identifier varies in format and is supplied by the contributing organization Attribute: Attribute_Label: TIMEZONE Attribute_Definition: Time-zone correction Attribute_Definition_Source: NGDC Attribute_Domain_Values: Unrepresentable_Domain: In our datasets, no correction was applied. All values equal 0. Attribute: Attribute_Label: DATE Attribute_Definition: Survey Date Attribute_Definition_Source: NGDC Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 19940808 Range_Domain_Maximum: 19940815 Attribute_Units_of_Measure: YYYYMMDD, (four digit year, two digit month, two digit day) Attribute: Attribute_Label: TIME Attribute_Definition: Time Attribute_Definition_Source: NGDC Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 2359.9667 Attribute_Units_of_Measure: hours and decimal minutes Attribute: Attribute_Label: LAT Attribute_Definition: Latitude Attribute_Definition_Source: World Geodetic System 1984 Geographic Coordinate System Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 58.10867 Range_Domain_Maximum: 59.0855 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: LON Attribute_Definition: Longitude Attribute_Definition_Source: World Geodetic System 1984 Geographic Coordinate System Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -138.99933 Range_Domain_Maximum: -135.4605 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: POS_TYPE Attribute_Definition: Indicates how lat/lon was obtained Attribute_Definition_Source: NGDC Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 1 Enumerated_Domain_Value_Definition: Observed fix Enumerated_Domain_Value_Definition_Source: NGDC Enumerated_Domain: Enumerated_Domain_Value: 3 Enumerated_Domain_Value_Definition: Interpolated fix Enumerated_Domain_Value_Definition_Source: NGDC Enumerated_Domain: Enumerated_Domain_Value: nil Enumerated_Domain_Value_Definition: unspecified Enumerated_Domain_Value_Definition_Source: NGDC Attribute: Attribute_Label: BAT_TTIME Attribute_Definition: Bathymetry, 2-way travel time Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.09333 Range_Domain_Maximum: 0.38667 Attribute_Units_of_Measure: seconds Detailed_Description: Entity_Type: Entity_Type_Label: a194gb.h77t Entity_Type_Definition: MGD77T single-beam bathymetry header file for A-1-94-GB Entity_Type_Definition_Source: NOAA's National Geophysical Data Center, See Hittelman and others (2010) Cross_Reference section above for details about the MGD77T format and citation information. Attribute: Attribute_Label: SURVEY_ID Attribute_Definition: Survey identifier supplied by the contributing organization Attribute_Definition_Source: NGDC Attribute_Domain_Values: Unrepresentable_Domain: This identifier varies in format and is supplied by the contributing organization Attribute: Attribute_Label: FORMAT_77 Attribute_Definition: Format Acronym Attribute_Definition_Source: NGDC Attribute_Domain_Values: Unrepresentable_Domain: Text string description Attribute: Attribute_Label: PARAMS_CO Attribute_Definition: Parameters surveyed codes. Attribute_Definition_Source: NGDC Attribute_Domain_Values: Unrepresentable_Domain: Status of geophysical parameters for this survey. See Hittelman and others (2010) from the Cross_Reference section above for details. Attribute: Attribute_Label: INST_SRC Attribute_Definition: Source Institution Attribute_Definition_Source: NGDC Attribute_Domain_Values: Unrepresentable_Domain: Text string description Attribute: Attribute_Label: COUNTRY Attribute_Definition: Country Attribute_Definition_Source: NGDC Attribute_Domain_Values: Unrepresentable_Domain: Text string description Attribute: Attribute_Label: PLATFORM Attribute_Definition: Platform name Attribute_Definition_Source: NGDC Attribute_Domain_Values: Unrepresentable_Domain: Text string description Attribute: Attribute_Label: PLAT_TYPCO Attribute_Definition: Platform type code Attribute_Definition_Source: NGDC Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: nil Enumerated_Domain_Value_Definition: Unspecified Enumerated_Domain_Value_Definition_Source: NGDC Enumerated_Domain: Enumerated_Domain_Value: 1 Enumerated_Domain_Value_Definition: Surface Ship Enumerated_Domain_Value_Definition_Source: NGDC Enumerated_Domain: Enumerated_Domain_Value: 2 Enumerated_Domain_Value_Definition: Submersible Ship Enumerated_Domain_Value_Definition_Source: NGDC Enumerated_Domain: Enumerated_Domain_Value: 3 Enumerated_Domain_Value_Definition: Aircraft Enumerated_Domain_Value_Definition_Source: NGDC Enumerated_Domain: Enumerated_Domain_Value: 4 Enumerated_Domain_Value_Definition: Buoy Enumerated_Domain_Value_Definition_Source: NGDC Enumerated_Domain: Enumerated_Domain_Value: 5 Enumerated_Domain_Value_Definition: Mobile land Enumerated_Domain_Value_Definition_Source: NGDC Enumerated_Domain: Enumerated_Domain_Value: 6 Enumerated_Domain_Value_Definition: Fixed land Enumerated_Domain_Value_Definition_Source: NGDC Enumerated_Domain: Enumerated_Domain_Value: 7 Enumerated_Domain_Value_Definition: Deep tow Enumerated_Domain_Value_Definition_Source: NGDC Attribute: Attribute_Label: PLAT_TYP Attribute_Definition: Platform type Attribute_Definition_Source: NGDC Attribute_Domain_Values: Unrepresentable_Domain: Text string description Attribute: Attribute_Label: CHIEF Attribute_Definition: Chief Scientist(s) Attribute_Definition_Source: NGDC Attribute_Domain_Values: Unrepresentable_Domain: Text string description Attribute: Attribute_Label: PROJECT Attribute_Definition: Project, cruise, leg Attribute_Definition_Source: NGDC Attribute_Domain_Values: Unrepresentable_Domain: Text string description Attribute: Attribute_Label: FUNDING Attribute_Definition: funding Attribute_Definition_Source: NGDC Attribute_Domain_Values: Unrepresentable_Domain: Text string description Attribute: Attribute_Label: DATE_DEP Attribute_Definition: survey departure date Attribute_Definition_Source: NGDC Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 19770427 Range_Domain_Maximum: 20000629 Attribute_Units_of_Measure: YYYYMMDD (four digit year, two digit month, two digit day) Attribute: Attribute_Label: PORT_DEP Attribute_Definition: port of departure Attribute_Definition_Source: NGDC Attribute_Domain_Values: Unrepresentable_Domain: Text string description Attribute: Attribute_Label: DATE_ARR Attribute_Definition: survey arrival date Attribute_Definition_Source: NGDC Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 19770427 Range_Domain_Maximum: 20000629 Attribute_Units_of_Measure: YYYYMMDD (four digit year, two digit month, two digit day) Attribute: Attribute_Label: PORT_ARR Attribute_Definition: port of arrival Attribute_Definition_Source: NGDC Attribute_Domain_Values: Unrepresentable_Domain: Text string description Attribute: Attribute_Label: NAV_INSTR Attribute_Definition: navigation instrumentation Attribute_Definition_Source: NGDC Attribute_Domain_Values: Unrepresentable_Domain: Text string description Attribute: Attribute_Label: POS_INFO Attribute_Definition: position determination method/ geodetic datum Attribute_Definition_Source: NGDC Attribute_Domain_Values: Unrepresentable_Domain: Text string description Attribute: Attribute_Label: BATH_INSTR Attribute_Definition: bathymetry instrumentation Attribute_Definition_Source: NGDC Attribute_Domain_Values: Unrepresentable_Domain: Text string description Attribute: Attribute_Label: BATH_ADD Attribute_Definition: additional forms of bathymetry Attribute_Definition_Source: NGDC Attribute_Domain_Values: Unrepresentable_Domain: Text string description Attribute: Attribute_Label: LAT_TOP Attribute_Definition: Latitude Attribute_Definition_Source: World Geodetic System 1984 Geographic Coordinate System Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 16.38240 Range_Domain_Maximum: 89.98766 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: LAT_BOTTOM Attribute_Definition: Latitude Attribute_Definition_Source: World Geodetic System 1984 Geographic Coordinate System Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 16.38240 Range_Domain_Maximum: 89.98766 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: LON_LEFT Attribute_Definition: Longitude Attribute_Definition_Source: World Geodetic System 1984 Geographic Coordinate System Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 10.30551 Range_Domain_Maximum: -117.13802 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: LON_RIGHT Attribute_Definition: Longitude Attribute_Definition_Source: World Geodetic System 1984 Geographic Coordinate System Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 10.30551 Range_Domain_Maximum: -117.13802 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: BATH_DRATE Attribute_Definition: general digitizing rate of bathymetry Attribute_Definition_Source: NGDC Attribute_Domain_Values: Unrepresentable_Domain: Text string description Attribute: Attribute_Label: SOUND_VEL Attribute_Definition: assumed sound velocity Attribute_Definition_Source: NGDC Attribute_Domain_Values: Unrepresentable_Domain: Text string description Attribute: Attribute_Label: VDATUM_CO Attribute_Definition: bathymetric vertical datum Attribute_Definition_Source: NGDC Attribute_Domain_Values: Unrepresentable_Domain: In our datasets, no correction was applied. All values equal 0. Overview_Description: Entity_and_Attribute_Overview: Bathymetry and navigation data for U.S. Geological Survey bathymetry survey A-1-94-GB in MGD77T format. Entity_and_Attribute_Detail_Citation: Attributes are obtained from MGD77T data files created from the navigation and bathymetry best files. MGD77T is the standard, defined data format used for geophysical data in the National Geophysical Data Center. The MGD77T format contains more attributes than defined here. Attributes that were null for this data were not included. Details about other attributes can be found in Hittelman and others (2010), see Cross_Reference section above for citation details. Metadata_Reference_Information: Metadata_Date: 20120802 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Heather A. Schreppel Contact_Organization: Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey Contact_Position: IT Management Specialist/Database Support Assistant Contact_Address: Address_Type: mailing and physical address Address: U.S. Geological Survey, 600 Fourth Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: (727) 803-8747, ext. 3013 Contact_Electronic_Mail_Address: hschreppel@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998