Metadata: Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Originator: Coastal and Marine Geology Program Publication_Date: 2013 Title: l478bs.m77t - MGD77 data file for Geophysical data from field activity L-4-78-BS in Bering Sea, Alaska from 07/08/1978 to 08/01/1978 Geospatial_Data_Presentation_Form: tab-delimited ASCII text files Publication_Information: Publication_Place: Menlo Park, CA Publisher: U.S. Geological Survey Online_Linkage: http://www.ngdc.noaa.gov/mgg/trk/trackline/samuel_p._lee/l478bs/mgd77/ Larger_Work_Citation: Citation_Information: Originator: Wm. Clinton Steele Originator: Carolyn H. Degnan Originator: Gary B. Deeter Originator: Jean A. Riordan Publication_Date: 1980 Title: DESCRIPTION OF MARINE GEOPHYSICAL DATA COLLECTED BY THE U.S. GEOLOGICAL SURVEY AND HOW TO OBTAIN IT Edition: 1.0 Geospatial_Data_Presentation_Form: Digital Document Series_Information: Series_Name: U.S. Geological Survey Open File Report Issue_Identification: 167 Publication_Information: Publication_Place: Menlo Park, CA Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/of/1989/0167/report.pdf Description: Abstract: Single-beam bathymetry, gravity, and magnetic data along with DGPS navigation data was collected as part of field activity L-4-78-BS in Bering Sea, Alaska from 07/08/1978 to 08/01/1978, http://walrus.wr.usgs.gov/infobank/l/l478bs/html/l-4-78-bs.meta.html 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/l/l478bs/html/l-4-78-bs.bath.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 Satellite Integrated Navigation (SINS) system. The system is a space-based satellite navigation maintained by the United States government and is accessible using a satellite receiver. This system provides navigational accuracy of approximately 200 m.The Data Acquistion, 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 (.05x) space-delimited ASCII data file. The header information rows are indicated by lines beginning with the character "!". There is no information on how the single-beam bathymetry, gravity, and magnetic data were collected. For each data gathering cruise leg, the available data in the following categories are forwarded to NGDC: navigation, gravity, magnetics, bathymetry, and seismic shot points. The available data for each cruise leg are re-formatted and combined into the Marine Geophysical Data Exchange Format (MGD77) and into the internal NGDC SEIS-NAV format by USGS using several USGS developed FORTRAN programs.The FORTRAN programs sample the navigation to every integer minute of the cruise. When necessary, the latitudes and longitudes are linearly interpolated. If the time between the actual navigation fixes exceeds five minutes, no data are included in the MGD77 file.To build the MGD77 file, gravity, magnetics, and bathymetry are added to this sampled navigation. When necessary, gravity, magnetics, and bathymetry data are linearly interpolated if the time between the actual data samples does not exceed five minutes. If a time gap exceeds this, the data are not reported.The navigation data are merged with the seismic shot point data in a SEIS- NAV format file. For this file, navigation data are interpolated for each shot point. Both types of files are written to magnetic tape and sent to NGDC. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 19780708 Ending_Date: 19780801 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -179.18130 East_Bounding_Coordinate: -152.06920 North_Bounding_Coordinate: 64.43768 South_Bounding_Coordinate: 52.55072 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:8182a402-6676-49c6-a163-d19b20aa9ed1 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: Marine Gravity Field Theme_Keyword: Marine Magnetic Field Theme_Keyword: Magnetic Anomalies Theme_Keyword: Bathymetry Theme_Keyword: Water Depth Theme_Keyword: Seafloor Topography Theme: Theme_Keyword_Thesaurus: Data Categories for Marine Planning Theme_Keyword: distributions Theme_Keyword: bathymetry and elevation Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords Theme_Keyword: single-beam echo sounder Theme_Keyword: gravimetry Theme_Keyword: magnetic field observations Theme_Keyword: marine geophysics Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: single-beam echo sounder Theme_Keyword: bathymetry measurement Theme_Keyword: bathymetry Theme_Keyword: gravimeter measurement Theme_Keyword: magnetometer measurement Theme_Keyword: marine geophysics Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: AK Place_Keyword: Alaska Place_Keyword: Bering Sea Place_Keyword: Bering Sea, Alaska Place_Keyword: USA 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.This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.Although this Federal Geographic Data Committee-compliant metadata file is intended to document these data in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Gregory K. Miller Contact_Organization: U.S. Geological Survey Contact_Position: Physical Scientist 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. 3020 Contact_Electronic_Mail_Address: gmiller@usgs.gov Data_Set_Credit: Alan Cooper (Chief Scientist); Mike Marlow (Chief Scientist) 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: Publication_Place: Boulder, CO Publisher: National Geophysical Data Center, National Oceanic and Atmospheric Administration 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 >Navigation Data (l-4-78-bs.010 [DRS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197807080653000 197807210640100 >197807210703500 197807211802300 >197807211818200 197807212151400 >197807212206400 197807220042000 >197807220125200 197807220210000 >197807220225100 197807220230100 >197807220308300 197807220439500 >197807220518500 197807230100000 >197807230122000 197807230136000 >197807230200000 197807230200000 >197807230230000 197807230230000 >197807230300000 197807230300000 >197807230330000 197807230330000 >197807230430000 197807230430000 >197807230500000 197807230500000 >197807230530000 197807230530000 >197807230630000 197807230630000 >197807230700000 197807230700000 >197807230730000 197807230730000 >197807230744000 197807230744000 >197807230756000 197807230800000 >197807231009380 197807232235500 >197807232248100 197807251105100 >197807251123500 197807251259300 >197807251310500 197807261659300 >197807261732300 197807262129100 >197807262209300 197807270044300 >197807270104500 197807270230100 >197807270404300 197807270611500 >197807270649300 197807270911300 >197807270925100 197807271616000 >197807271908000 197807280402200 >197807280417200 197807280454200 >197807280506000 197807281640400 >197807281659000 197807291514000 >197807291603300 197807291641500 >197807291706500 197807292102500 >197807292204200 197807292250400 >197807292336400 197807300123500 >197807300211500 197807300211500 >197807300311100 197807301204500 >197807301223100 197807302135100 >197807302159300 197807311953500 >197807312004500 197808011729500 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (l-4-78-bs.165_010) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197807082035300 197807100655300 >197807150920420 197807151502420 >197807152204120 197807160536300 >197807161925300 197807170300000 >197807170306120 197807170402120 >197807200922000 197807201410000 >197807201432000 197807201852000 >197807210653120 197807211119120 >197807211136120 197807211730120 >197807211921000 197807212129000 >197807212155000 197807220043000 >197807220053420 197807220155420 >197807220234480 197807220434480 >197807220454480 197807220755420 >197807220804420 197807221133120 >197807221141480 197807221623480 >197807221643480 197807221945480 >197807231029480 197807231203480 >197807231737480 197807240253480 >197807240309480 197807240535480 >197807240600000 197807240703480 >197807240726480 197807240910480 >197807240927480 197807240939480 >197807241005480 197807241027480 >197807241035480 197807241153480 >197807241212480 197807241312480 >197807241335480 197807241529480 >197807241555480 197807241747480 >197807241816480 197807241906480 >197807241946480 197807250038480 >197807250339480 197807251231480 >197807251257480 197807251629480 >197807251654480 197807251712480 >197807251727480 197807251939480 >197807260309480 197807260447480 >197807260506480 197807260722480 >197807260752480 197807261322480 >197807261350480 197807261450480 >197807261525480 197807262057480 >197807302359120 197807310135120 >197807310203120 197807311229120 >197807311237120 197808011559120 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (l-4-78-bs.260_010) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197807100757280 197807101025340 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-4-78-bs.335_010) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197807091912300 197807091937480 >197807091955420 197807092059300 >197807092236420 197807100103360 >197807100109120 197807100113300 >197807100144540 197807100201240 >197807100226120 197807100233120 >197807100239300 197807100255540 >197807100306180 197807100310180 >197807100317000 197807100317000 >197807100326060 197807100708360 >197807100714120 197807100737360 >197807100818300 197807100957120 >197807101037480 197807101304360 >197807101329360 197807101626180 >197807101638480 197807101722240 >197807101728120 197807101804360 >197807101823180 197807102303540 >197807102314120 197807110119000 >197807110125360 197807111250000 >197807111255180 197807112002540 >197807112008000 197807112008000 >197807112013480 197807112111420 >197807112116480 197807112116480 >197807112122000 197807112150180 >197807112155360 197807112200120 >197807112206000 197807112206000 >197807112211240 197807112211240 >197807112216300 197807112218300 >197807112224240 197807112228240 >197807112235360 197807112235360 >197807112242480 197807112242480 >197807112248240 197807112248240 >197807112254360 197807112254360 >197807112300000 197807112329300 >197807112334420 197807112352000 >197807120025180 197807120033240 >197807120039060 197807120043300 >197807120048360 197807120048360 >197807120056060 197807120056060 >197807120101240 197807120101240 >197807120108060 197807120108060 >197807120114000 197807120118540 >197807120124060 197807120129060 >197807120136420 197807121248360 >197807121254060 197807121315300 >197807121321060 197807121329300 >197807121335060 197807121350060 >197807121356120 197807121453060 >197807121458120 197807121758060 >197807121803120 197807122110120 >197807122117360 197807130431180 >197807130450360 197807130541540 >197807130556540 197807130556540 >197807130709420 197807131010420 >197807131016060 197807131020420 >197807131032540 197807131136420 >197807131144060 197807131323240 >197807131352120 197807131609000 >197807131624420 197807132301000 >197807132315240 197807140132060 >197807140143000 197807140143000 >197807140148240 197807140208060 >197807140214120 197807140438480 >197807140510540 197807140600540 >197807140619420 197807140621480 >197807140634180 197807140638360 >197807140645060 197807140703420 >197807140709120 197807140939180 >197807140945360 197807141007060 >197807141012540 197807141012540 >197807141018060 197807141021180 >197807141026360 197807141313060 >197807141326300 197807141812240 >197807141818060 197807142112420 >197807142127240 197807150025000 >197807150036540 197807150314120 >197807150322240 197807150438000 >197807150447000 197807150705120 >197807160107180 197807160228360 >197807160257180 197807160308180 >197807160313240 197807160313240 >197807160349480 197807160620060 >197807160629480 197807160643420 >197807160649120 197807160655060 >197807160744180 197807161122360 >197807161230060 197807161453240 >197807161512120 197807161553240 >197807161632300 197807161649240 >197807161708480 197807161809180 >197807161819240 197807161819240 >197807161826480 197807161826480 >197807161832540 197807161832540 >197807161838360 197807161842300 >197807161905240 197807162100000 >197807162113120 197807162245240 >197807162300300 197807162309120 >197807162318240 197807162357180 >197807170012000 197807170029300 >197807170035000 197807170044180 >197807170051240 197807170153000 >197807170201300 197807170232000 >197807170249480 197807170502240 >197807170524300 197807170638240 >197807170646480 197807170655480 >197807170713300 197807170749180 >197807170851300 197807171023480 >197807171515480 197807171555540 >197807171617240 197807171722240 >197807171737180 197807172036540 >197807180056300 197807180103180 >197807180109120 197807180541120 >197807180549360 197807180620480 >197807180626300 197807180705240 >197807180735000 197807180846180 >197807180852000 197807180852000 >197807181552000 197807181930240 >197807182007540 197807182034300 >197807182040060 197807182113060 >197807182124480 197807182214060 >197807182230540 197807182242420 >197807182248240 197807182248240 >197807182253480 197807182255180 >197807182310120 197807182311420 >197807182324060 197807182339300 >197807182347300 197807190012540 >197807190020000 197807190058480 >197807190113420 197807190120000 >197807190201000 197807190208480 >197807190229120 197807190303180 >197807190316060 197807190323180 >197807191705240 197807191856180 >197807191911540 197807192054000 >197807192059240 197807192156180 >197807192205120 197807192310300 >197807192316120 197807200006000 >197807200031300 197807200140420 >197807200148300 197807200201300 >197807200209060 197807200209060 >197807200216060 197807200216060 >197807200224360 197807200224360 >197807200232360 197807200236240 >197807200519480 197807200616060 >197807200621420 197807200707360 >197807200744000 197807200914180 >197807201340360 197807201413540 >197807211738360 197807211831480 >197807211837540 197807211840480 >197807211847480 197807211849540 >197807211856180 197807211925420 >197807211932360 197807211947540 >197807211957240 197807212008180 >197807212025000 197807212116480 >197807212131420 197807212205540 >197807212214480 197807212228120 >197807212238300 197807212319300 >197807212328300 197807220124060 >197807240112000 197807240112000 >197807240117240 197807240127000 >197807240147240 197807240208420 >197807240215240 197807240215240 >197807240221300 197807240231300 >197807240236420 197807240248000 >197807240256360 197807240304540 >197807240311120 197807240313420 >197807240324000 197807240324000 >197807240329480 197807240336240 >197807240344060 197807240355420 >197807240403120 197807240403120 >197807240412420 197807240412420 >197807240418480 197807240418480 >197807240453540 197807240634420 >197807240640060 197807240648480 >197807240654120 197807240654120 >197807240659480 197807240659480 >197807240705480 197807240711420 >197807240717000 197807240722000 >197807240727120 197807240727120 >197807240732360 197807240809480 >197807240820240 197807240822120 >197807240830060 197807240845540 >197807240855300 197807240855300 >197807240905360 197807241011180 >197807241018120 197807241152420 >197807241159540 197807241304360 >197807241310060 197807241315060 >197807241320360 197807241332540 >197807241338000 197807241338000 >197807241343360 197807241343360 >197807241349360 197807241349360 >197807241355420 197807241355420 >197807241402180 197807241402180 >197807241408360 197807241408360 >197807241415240 197807241415240 >197807241423000 197807241423000 >197807270103420 197807270231120 >197807272314540 197807272333480 >197807272338540 197807272353180 >197807272358240 197807280002540 >197807280008120 197807280008120 >197807280013240 197807280040540 >197807280047000 197807280058480 >197807280105420 197807280142240 >197807280151120 197807280212180 >197807280219000 197807280222180 >197807280434420 197807280441420 >197807280447120 197807280615480 >197807290247180 197807290325060 >197807290339000 197807290434540 >197807290440120 197807290440120 >197807290445480 197807290450480 >197807290456180 197807290511360 >197807302134120 197807302315360 >197807302321120 197807302321120 >197807302327360 197807302332240 >197807302338300 197807302338300 >197807302344360 197807302344360 >197807302349480 197807302349480 >197807302355240 197807302355240 >197807310000480 197807310041420 >197807310121120 197807310154060 >197807310201180 197807310413060 >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: Navigation Data >Converted to time format with year at start. > >01/15/86 KAYE DUA0:[DATA.L578BS.N]L578BS.010; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > Process_Date: 19960119 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: Gravity Data >10/31/1998 /tiger/l/l478bs/grav/l-4-78-bs.165_010 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >05/02/86 CLINT DUA0:[DATA.L578BS]L578BS.165; >DRB0:[CLINT]REFMTJCGRV.EXE; >reformatted from JChilds file l578bs.sm_grv > >Input was... >Converted to time format with year at start. > >01/15/86 KAYE DUA0:[DATA.L578BS.N]L578BS.010; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >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: Magnetics Data >06/21/2012 carolyn l-4-78-bs.260_010 > >Reprocessed using subroutines from Susan Macmillan's >IGRF SYNTHESIS PROGRAM http://www.ngdc.noaa.gov/IAGA/vmod/igrf11.f >with IGRF-11 coeffiecients integrated into the source code. >/infobank/programs/mag/magred11/magred11.for >Using geodetic coordinate system (Earth shape approximated by spheriod) >with altitude 0.0 km (for sea level). > >Input was... >10/31/1998 /tiger/l/l478bs/mag/l-4-78-bs.240_010 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >01/21/86 CAROLYN DRS$DATA:[L578BS.M]L578BS.240; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 >191/0757-194/0836: > was L578BS._.MAGSC1 on TAM173 > was L578BS220.DAT on VAM173 >194/1247-205/1246: > was L578BS._.MAGSC2 on TAM174 > was L578BS220.DAT on VAM174 > >Converted to time format with year at start. > >01/15/86 KAYE DUA0:[DATA.L578BS.N]L578BS.010; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >time, lat, long, time(sec) to nearest nav fix, data values Process_Date: 20120621 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG) Contact_Person: Carolyn H. Degnan Contact_Position: Geophysicist Contact_Address: Address_Type: mailing and physical address Address: USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive City: Santa Cruz State_or_Province: CA Postal_Code: 95060-5792 Country: USA Contact_Voice_Telephone: (831) 460-7452 Contact_Facsimile_Telephone: (831) 427-4748 Contact_Electronic_Mail_Address: infobank@octopus.wr.usgs.gov Process_Step: Process_Description: Bathymetry Data >10/31/1998 /tiger/l/l478bs/bath/l-4-78-bs.335_010 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >02/12/86 BECKIE DISK$USERDISK:[BECKIE.TEMP]L578BS.335; >DRB0:[DRS.BAT]BATRED.EXE;1 >This file was hand-digetized in 2-way traveltime(secs). >It was reduced with no Matthews correction and velocity >of sound assumed was 1500m/sec. > >Input was... >Converted to time format with year at start. > >01/15/86 KAYE DUA0:[DATA.L578BS.N]L578BS.010; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >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: MGD77 file creation - The available data for each cruise leg are re-formatted and combined into the Marine Geophysical Data Exchange Format (MGD77) and into the internal NGDC SEIS-NAV format by USGS using several USGS developed FORTRAN programs.The FORTRAN programs sample the navigation to every integer minute of the cruise. When necessary, the latitudes and longitudes are linearly interpolated. If the time between the actual navigation fixes exceeds five minutes, no data are included in the MGD77 file.To build the MGD77 file, gravity, magnetics, and bathymetry are added to this sampled navigation. When necessary, gravity, magnetics, and bathymetry data are linearly interpolated if the time between the actual data samples does not exceed five minutes. If a time gap exceeds this, the data are not reported.The navigation data are merged with the seismic shot point data in a SEIS- NAV format file. For this file, navigation data are interpolated for each shot point. Both types of files are written to magnetic tape and sent to NGDC. Process_Date: 20120620 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: Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. Process_Date: 20170201 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Alan O. Allwardt Contact_Position: Contractor -- Information Specialist Contact_Address: Address_Type: mailing and physical address Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-460-7551 Contact_Facsimile_Telephone: 831-427-4748 Contact_Electronic_Mail_Address: aallwardt@usgs.gov Process_Step: Process_Description: Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. Process_Date: 20201019 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: Indirect_Spatial_Reference: Bering Sea, Alaska 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: l478bs.m77t Entity_Type_Definition: MGD77T single-beam bathymetry data file for L478BS 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: YYYYMMDD Attribute_Definition_Source: NGDC Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 19780708 Range_Domain_Maximum: 19780801 Attribute_Units_of_Measure: Year, month, 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 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: 52.55072 Range_Domain_Maximum: 64.43557 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: -179.18107 Range_Domain_Maximum: -152.06930 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: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 3 Attribute_Units_of_Measure: 1 = observed fix, 3 = interpolated fix, nil = unspecified 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: 0.073 Range_Domain_Maximum: 9.161 Attribute_Units_of_Measure: seconds Attribute: Attribute_Label: CORR_DEPTH Attribute_Definition: Bathymetry, corrected depth Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 54.7 Range_Domain_Maximum: 6943.7 Attribute_Units_of_Measure: decimal meters Attribute: Attribute_Label: BAT_CPCO Attribute_Definition: Bathymetric Correction code - details the procedure used for determining the sound velocity correction to depth Attribute_Definition_Source: NGDC Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 63 Range_Domain_Maximum: 63 Attribute_Units_of_Measure: 01-55 Matthews' Zones with zone , 59 Matthews' Zones, no zone specified, 60 S. Kuwahara Formula, 61 Wilson Formula, 62 Del Grosso Formula, 63 Carter's Tables, 88 Other (see Add. Doc.), 97 Computed using 1500 meters/sec, 98 Unknown if Corrected, 99 Unspecified Attribute: Attribute_Label: BAT_TYPCO Attribute_Definition: Bathymetry type code - indicates how the bathymetric value was obtained Attribute_Definition_Source: NGDC Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 3 Attribute_Units_of_Measure: 1 - Observed, 3 - Interpolated (Header Seq. 12), 9 - Unspecified Attribute: Attribute_Label: MAG_TOT Attribute_Definition: Magnetics total field - 1st sensor Attribute_Definition_Source: NGDC Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 46240 Range_Domain_Maximum: 59846.5 Attribute_Units_of_Measure: gammas Attribute: Attribute_Label: MAG_TOT2 Attribute_Definition: Magnetics total field - 2nd sensor Attribute_Definition_Source: NGDC Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 45978 Range_Domain_Maximum: 52161 Attribute_Units_of_Measure: gammas Attribute: Attribute_Label: MAG_RES Attribute_Definition: Magnetics residual field field Attribute_Definition_Source: NGDC Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -3920.3 Range_Domain_Maximum: 8252.5 Attribute_Units_of_Measure: gammas Attribute: Attribute_Label: MAG_RESSEN Attribute_Definition: SENSOR FOR RESIDUAL FIELD Attribute_Definition_Source: NGDC Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 1 Attribute_Units_of_Measure: 1 - first sensor, 2 - second sensor, 9 - Unspecified Attribute: Attribute_Label: GRA_OBS Attribute_Definition: Observed gravity Attribute_Definition_Source: NGDC Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 981305.1 Range_Domain_Maximum: 982218.4 Attribute_Units_of_Measure: milligals Attribute: Attribute_Label: EOTVOS Attribute_Definition: EOTVOS correction - E = 7.5 V cos(phi) * sin(alpha) + 0.0042 V*V Attribute_Definition_Source: NGDC Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -39.8 Range_Domain_Maximum: 29.9 Attribute_Units_of_Measure: milligals Attribute: Attribute_Label: FREEAIR Attribute_Definition: Free-air Anomaly = G(observed) minus G(theoretical) Attribute_Definition_Source: NGDC Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -104.8 Range_Domain_Maximum: 107.3 Attribute_Units_of_Measure: milligals Overview_Description: Entity_and_Attribute_Overview: Bathymetry, gravity, magnetic, and navigation data for U.S. Geological Survey bathymetry survey L478BS in MGD77T format. Entity_and_Attribute_Detail_Citation: Attributes are obtained from MGD77T data files created from the navigation gravity, magnetic, and bathymetry best files. MGD77T is the standard, defined data format used for geophysical data in the National Geophysical Data Center. See Cross_Reference section above for citation details. Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing and physical address Address: 345 Middlefield Road MS 999 City: Menlo Park State_or_Province: CA Postal_Code: 94025 Country: USA Contact_Voice_Telephone: (650) 329-5078 Contact_Facsimile_Telephone: (650) 329-5190 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: MGD77t Format_Version_Number: 10 Format_Specification: MGD77 Format_Information_Content: tab-delimited ASCII text files. Transfer_Size: 2.1 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://www.ngdc.noaa.gov/mgg/trk/trackline/samuel_p._lee/l478bs/mgd77/ Access_Instructions: Data are available for download on the World Wide Web (WWW). Fees: None Metadata_Reference_Information: Metadata_Date: 20201019 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Gregory K. Miller Contact_Organization: U.S. Geological Survey Contact_Position: Physical Scientist 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. 3020 Contact_Electronic_Mail_Address: gmiller@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998