Metadata: Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Originator: Coastal and Marine Geology Program Publication_Date: 2013 Title: l576bs.m77t - MGD77 data file for Geophysical data from field activity L-5-76-BS in Southern Bering Sea Shelf from 07/28/1976 to 08/25/1976 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/l576bs/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-5-76-BS in Southern Bering Sea Shelf from 07/28/1976 to 08/25/1976, http://walrus.wr.usgs.gov/infobank/l/l576bs/html/l-5-76-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/l576bs/html/l-5-76-bs.bath.html, http://walrus.wr.usgs.gov/infobank/l/l576bs/html/l-5-76-bs.grav.html, and http://walrus.wr.usgs.gov/infobank/l/l576bs/html/l-5-76-bs.mag.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: 19760728 Ending_Date: 19760825 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: 176.72443 East_Bounding_Coordinate: -152.04282 North_Bounding_Coordinate: 64.48352 South_Bounding_Coordinate: 53.36707 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:3f1fd8f7-4c77-4075-b5b9-6be6861e0cd7 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: Southern Bering Sea Shelf 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 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-5-76-bs.011 [DRS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197607281256000 197608130406000 >197608130448000 197608131400000 >197608131500000 197608150112000 >197608150156000 197608160300000 >197608160342000 197608161230000 >197608161330000 197608162208000 >197608162252000 197608170400000 >197608170500000 197608171210000 >197608171300000 197608172358000 >197608180040000 197608190040000 >197608190130000 197608190130000 >197608190220000 197608190700000 >197608190746000 197608200612000 >197608200700000 197608201334000 >197608201430000 197608202300000 >197608210000000 197608210100000 >197608210200000 197608231400000 >197608231454000 197608240502000 >197608240600000 197608240608000 >197608240702000 197608241106000 >197608241200000 197608241242000 >197608241324000 197608241512000 >197608241600000 197608241700000 >197608241744000 197608250202000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (l-5-76-bs.165_011) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197607281511420 197607281926420 >197607281945420 197607290031000 >197607290037000 197607290039000 >197607290045180 197607300455180 >197607300505180 197607301659180 >197607301754180 197607301822180 >197607301846180 197607301926180 >197607310032180 197607310955480 >197608010051180 197608020418420 >197608020548420 197608031039000 >197608031114000 197608040058000 >197608040236000 197608041638000 >197608041812000 197608050800000 >197608050931000 197608051643000 >197608051800000 197608052136000 >197608061002480 197608061010480 >197608061016120 197608070637120 >197608070757120 197608070925120 >197608071028120 197608072046120 >197608072216120 197608080938120 >197608081057120 197608081559120 >197608081725120 197608082159120 >197608082212120 197608090408120 >197608090432120 197608090806120 >197608091204120 197608091422120 >197608091516120 197608092014120 >197608120230180 197608120312420 >197608130901120 197608131353480 >197608131746480 197608131924120 >197608131930300 197608131943480 >197608132219300 197608140217120 >197608140222300 197608140238120 >197608140245300 197608140245300 >197608140409300 197608140421120 >197608140426480 197608140607480 >197608141509120 197608141912120 >197608141922120 197608142024120 >197608150104120 197608150154120 >197608150442120 197608151158120 >197608151436120 197608151922120 >197608152020120 197608160957120 >197608161005420 197608161616120 >197608161638120 197608170210300 >197608170301300 197608170913300 >197608170937300 197608181556120 >197608181700000 197608192029480 >197608192052120 197608201750300 >197608201930300 197608211118420 >197608211230420 197608220949420 >197608222227000 197608222238420 >197608222246180 197608222252180 >197608222308000 197608230156180 >197608230316180 197608230800000 >197608231057420 197608231151000 >197608231157000 197608231221420 >197608231228000 197608231228000 >197608231235420 197608231238420 >197608231245420 197608231245420 >197608231252000 197608231347420 >197608232104000 197608240316420 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (l-5-76-bs.260_011) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197607311312000 197607312102000 >197607312114000 197608010046000 >197608010100000 197608020347320 >197608020357370 197608020834120 >197608020840480 197608031144190 >197608031150590 197608041646560 >197608041700040 197608081409150 >197608081450490 197608090819130 >197608091212140 197608091926120 >197608120411160 197608161008560 >197608161022360 197608162301380 >197608162308260 197608170207020 >197608170441150 197608170441430 >197608170946120 197608180518520 >197608180524520 197608201827390 >197608201842020 197608222121260 >197608230521590 197608231411060 >197608231821570 197608240443310 >197608240449590 197608240905370 >197608240921530 197608242334520 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-5-76-bs.335_011) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197607281257000 197607290513540 >197607290554420 197607291843360 >197607291900000 197607292149540 >197607292205000 197607292224480 >197607292317120 197607310224480 >197607310300060 197607310831000 >197607310929420 197608010919540 >197608010931240 197608021612000 >197608021629060 197608031318420 >197608031331180 197608032256060 >197608032322240 197608041634300 >197608041700180 197608050034000 >197608050044120 197608050531540 >197608050627480 197608050704120 >197608050716420 197608050836240 >197608050912120 197608051919060 >197608051930480 197608061302060 >197608061322120 197608061355360 >197608061415120 197608062019480 >197608062043120 197608062231540 >197608062249480 197608071907480 >197608071919540 197608080900000 >197608080938420 197608090033000 >197608090107540 197608090841420 >197608091227300 197608092128060 >197608120119120 197608120220240 >197608120241060 197608120313540 >197608120324360 197608120415360 >197608120432240 197608120908060 >197608120921060 197608121600180 >197608121620540 197608122106240 >197608122132000 197608130029480 >197608130156060 197608130822480 >197608130839000 197608131400060 >197608131452240 197608141405000 >197608141451000 197608141700000 >197608141742000 197608142307480 >197608142327120 197608150045480 >197608150056000 197608150157420 >197608150212360 197608150428540 >197608150441480 197608151233540 >197608151244360 197608151945060 >197608151958060 197608160500000 >197608160537060 197608160644300 >197608160701240 197608160930420 >197608160942180 197608161134480 >197608161221000 197608161705120 >197608161746240 197608172136480 >197608172223000 197608180228540 >197608180406480 197608190221480 >197608190754360 197608201447420 >197608201544000 197608211105300 >197608211116000 197608230231240 >197608230318240 197608231206240 >197608231218420 197608240920480 >197608241258300 197608250017480 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Seismic Shots Data (l-5-76-bs.422_011) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197607311032000 197607311032000 >197607311101000 197607311120220 >197607311208040 197607311352310 >197607311413300 197607311645490 >197607311712010 197607311936510 >197607312002000 197607312108300 >197607312131300 197608010302450 >197608010330400 197608011000300 >197608011036000 197608011236350 >197608011303310 197608011527450 >197608011559150 197608012033250 >197608012101370 197608020417000 >197608020548000 197608021336120 >197608021405230 197608021630000 >197608021654000 197608031040070 >197608031114210 197608031919320 >197608031947190 197608040100000 >197608040235000 197608041240200 >197608041310450 197608041635000 >197608041810000 197608042225470 >197608042247480 197608042255350 >197608042324500 197608050411370 >197608050436000 197608050801100 >197608050930000 197608051653000 >197608051850210 197608062319250 >197608062347150 197608070014000 >197608071028050 197608071233050 >197608071306410 197608071337400 >197608071401260 197608072047200 >197608072215120 197608080030450 >197608080103000 197608080428000 >197608080453080 197608080937510 >197608081056270 197608081619250 >197608081725140 197608082055000 >197608082245320 197608090807000 >197608170954000 197608171014020 >197608171037060 197608180255090 >197608180319370 197608181728350 >197608181758110 197608182058410 >197608182127120 197608191530000 >197608191554300 197608200654400 >197608200715540 197608201823270 >197608201938360 197608201938360 >197608202008540 197608210433250 >197608210502450 197608210912090 >197608210953000 197608210959000 >197608211047330 197608211140280 >197608211235120 197608211513020 >197608211543000 197608211939020 >197608212006070 197608230155000 >197608230315560 197608230452000 >197608230517360 197608230916500 >197608230937270 197608231410070 >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. > >01/31/86 KAYE DUA0:[DATA.L576BS.N]L576BS.011; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > Process_Date: 20001030 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/l576bs/grav/l-5-76-bs.165_011 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >05/02/86 CLINT DUA0:[DATA.L576BS]L576BS.165; >DRB0:[CLINT]REFMTJCGRV.EXE; >reformatted from JChilds file L576.SMGRV > >Input was... >Converted to time format with year at start. > >01/31/86 KAYE DUA0:[DATA.L576BS.N]L576BS.011; >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-5-76-bs.260_011 > >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/l576bs/mag/l-5-76-bs.240_011 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >01/06/86 CAROLYN DRS$DATA:[L576BS.M]L576BS.240; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 >213/1312-214/0140 from Clint was F.5 >214/0148-237/2334 from Barb was grvm file >233/0814-233/1827 from Clint was L576BS.CLN_MAG on MULT5 >234/0321-234/1244 from Clint was F.3 >234/1244-235/0604 from Clint was L576bs.CLN_MAG on MULT5 >235/0604-235/1841 from Clint was F.3 > >Converted to time format with year at start. > >01/31/86 KAYE DUA0:[DATA.L576BS.N]L576BS.011; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >time, lat, long, time(sec) to nearest nav fix, data values Process_Date: 20120621 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG) Contact_Person: Carolyn H. Degnan Contact_Position: Geophysicist Contact_Address: Address_Type: mailing and physical address Address: USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive City: Santa Cruz State_or_Province: CA Postal_Code: 95060-5792 Country: USA Contact_Voice_Telephone: (831) 460-7452 Contact_Facsimile_Telephone: (831) 427-4748 Contact_Electronic_Mail_Address: infobank@octopus.wr.usgs.gov Process_Step: Process_Description: Bathymetry Data >10/31/1998 /tiger/l/l576bs/bath/l-5-76-bs.335_011 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >02/10/86 BECKIE DISK$USERDISK:[BECKIE.TEMP]L576BS.335; >DRB0:[DRS.BAT]BATRED.EXE;1 >This file was hand-digetized in 2-way traveltime(secs). >No Matthews correction was applied and velocity of >sound assumed in reduction was 1500m/sec. > >Input was... >Converted to time format with year at start. > >01/31/86 KAYE DUA0:[DATA.L576BS.N]L576BS.011; >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: Southern Bering Sea Shelf 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: l576bs.m77t Entity_Type_Definition: MGD77Tsingle-beam bathymetry, gravity, and magnetics data file for L576BS 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: 19760728 Range_Domain_Maximum: 19760825 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: 2359.5 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: 53.36707 Range_Domain_Maximum: 64.48352 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: -179.99542 Range_Domain_Maximum: 179.99431 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: 0.013 Range_Domain_Maximum: 5.244 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: 9.8 Range_Domain_Maximum: 3909 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: 49122 Range_Domain_Maximum: 55032 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: 49116 Range_Domain_Maximum: 54754 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: -966.4 Range_Domain_Maximum: 1469.8 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: 981369.2 Range_Domain_Maximum: 982111.3 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: -52.2 Range_Domain_Maximum: 33.1 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: -93.5 Range_Domain_Maximum: 176.5 Attribute_Units_of_Measure: milligals Attribute: Attribute_Label: LINEID Attribute_Definition: LINE/TRACK/SEGMENT ID Attribute_Definition_Source: NGDC Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 49 Attribute_Units_of_Measure: Used, for example, to cross reference with seismic data. Attribute: Attribute_Label: POINTID Attribute_Definition: SEISMIC SHOT-POINT NUMBER/POINT ID Attribute_Definition_Source: NGDC Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 9958 Attribute_Units_of_Measure: Used, for example, to cross reference with seismic data. Overview_Description: Entity_and_Attribute_Overview: Bathymetry, gravity, magnetic, and navigation data for U.S. Geological Survey bathymetry survey L576BS 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: .430 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://www.ngdc.noaa.gov/mgg/trk/trackline/samuel_p._lee/l576bs/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