l184an.m77t - MGD77 data file for Geophysical data from field activity L-1-84-AN in Antarctica from 01/04/1984 to 02/01/1984

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey
Originator: Coastal and Marine Geology Program
Publication_Date: 2013
Title:
l184an.m77t - MGD77 data file for Geophysical data from field activity L-1-84-AN in Antarctica from 01/04/1984 to 02/01/1984
Geospatial_Data_Presentation_Form: tab-delimited ASCII text files
Publication_Information:
Publication_Place: Menlo Park, CA
Publisher: U.S. Geological Survey
Online_Linkage: 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-1-84-AN in Antarctica from 01/04/1984 to 02/01/1984, http://walrus.wr.usgs.gov/infobank/l/l184an/html/l-1-84-an.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/l184an/html/l-1-84-an.bath.html, http://walrus.wr.usgs.gov/infobank/l/l184an/html/l-1-84-an.grav.html, and http://walrus.wr.usgs.gov/infobank/l/l184an/html/l-1-84-an.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: 19840104
Ending_Date: 19840201
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: 129.74580
East_Bounding_Coordinate: 173.18375
North_Bounding_Coordinate: -43.58359
South_Bounding_Coordinate: -77.10433
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: 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: Antarctic
Place_Keyword: Antarctic Ocean
Place_Keyword: Antarctic Southern Ocean
Place_Keyword: Antarctica
Place_Keyword: Southern Hemisphere
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:
Monty Hampton (Chief Scientist); Steve Eittreim (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-1-84-an.070) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198401042117380 198401060155250 >198401060205460 198401100848000 >198401100904000 198401130719000 >198401130726000 198401150006070 >198401150019000 198401150019000 >198401150029060 198401150858380 >198401150904330 198401151109530 >198401151114540 198401151114540 >198401151124110 198401170023100 >198401170036170 198401200512180 >198401200522070 198401241617000 >198401241741000 198401301507000 >198401301513000 198402010618000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (l-1-84-an.155_070) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198401050142590 198401050515400 >198401050540070 198401060155190 >198401060242200 198401070006190 >198401070043510 198401070132400 >198401070147000 198401071426190 >198401071433590 198401072300190 >198401072309190 198401080120190 >198401080337200 198401080828400 >198401081154000 198401091959190 >198401100614410 198401110418400 >198401110431400 198401140614380 >198401140633380 198401140735580 >198401140806380 198401141500380 >198401152210170 198401160542590 >198401160607190 198401160919590 >198401161101190 198401170741380 >198401170839380 198401171416580 >198401171459580 198401180701580 >198401180805380 198401181525400 >198401181605200 198401190626190 >198401190717190 198401200130580 >198401200218380 198401200601580 >198401200640580 198401202240380 >198401202316500 198401210513190 >198401210609190 198401211827590 >198401211900590 198401221829190 >198401221907590 198401230111190 >198401230739590 198401231924580 >198401240301200 198401240443400 >198401240450200 198401240855190 >198401241520590 198401241729590 >198401250634190 198401251222200 >198401251325200 198401252235590 >198401252311590 198401260130190 >198401260816190 198401260946190 >198401261008590 198401261159190 >198401261236590 198401261351190 >198401261444190 198401262057190 >198401270038190 198401270440190 >198401270732590 198401272329590 >198401280346590 198401282358190 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (l-1-84-an.260_070) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198401132348400 198401140737160 >198401141623540 198401231943570 >198401270712030 198401290708110 >198401290716350 198401290813570 >198401290945340 198401291523330 >198401292001590 198401300432260 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-1-84-an.330_070) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198401150027180 198401150325300 >198401150333420 198401150441300 >198401150454540 198401150617060 >198401150630120 198401150707300 >198401150716120 198401150717180 >198401150725120 198401150919060 >198401150927420 198401151022480 >198401151028540 198401151111060 >198401151126000 198401151203360 >198401151217300 198401151232360 >198401151241540 198401151243180 >198401151301540 198401151323000 >198401151332180 198401151340300 >198401151350060 198401151357480 >198401151409060 198401160000420 >198401160005540 198401160011000 >198401160021300 198401160117060 >198401160123360 198401160225060 >198401160234300 198401160247180 >198401160255540 198401160301540 >198401160313240 198401160507540 >198401160514360 198401160514360 >198401160521240 198401160521240 >198401160526300 198401160526300 >198401160532300 198401160532300 >198401160537540 198401160541420 >198401160549480 198401160549480 >198401160555000 198401160607480 >198401160626120 198401161001180 >198401161012480 198401161024480 >198401161034000 198401161858360 >198401161908120 198401162208540 >198401162214060 198401162214060 >198401162219300 198401162219300 >198401162225000 198401162225000 >198401162231360 198401162231360 >198401162238480 198401162238480 >198401162245240 198401170023120 >198401170034480 198401170344540 >198401170354180 198401170759120 >198401170806300 198401171248120 >198401171254300 198401171713540 >198401171719420 198401171847000 >198401171904060 198401190018300 >198401190030300 198401190045120 >198401190108000 198401190205360 >198401190222120 198401190550180 >198401190558300 198401191320540 >198401191327540 198401191335000 >198401191342420 198401200003540 >198401200014360 198401200018120 >198401200025300 198401200513300 >198401200520180 198401200630000 >198401200636540 198401200717300 >198401200734120 198401200814480 >198401200822540 198401201112180 >198401201147000 198401201609060 >198401201614540 198401202324300 >198401202331360 198401202347060 >198401202354060 198401210239060 >198401210250540 198401210303000 >198401210310180 198401210400000 >198401210412120 198401210417480 >198401210427540 198401210453180 >198401210501000 198401210706420 >198401210714360 198401211149480 >198401211155240 198401211200540 >198401211209540 198401211211060 >198401211217180 198401211315060 >198401211323060 198401211333240 >198401211343360 198401211402120 >198401211417120 198401220127300 >198401220136480 198401220430060 >198401220438420 198401220512540 >198401220519480 198401220646240 >198401220653000 198401220816540 >198401220823300 198401221540300 >198401221547360 198401222359060 >198401230005000 198401230008540 >198401230023540 198401230214240 >198401230220180 198401230235000 >198401230252360 198401231118180 >198401231125240 198401231900000 >198401231929180 198401231934180 >198401231945120 198401231948480 >198401231955420 198401241621000 >198401241628000 198401241634000 >198401241640000 198401241654000 >198401241700000 198401242018000 >198401242028000 198401242032000 >198401242040000 198401242126000 >198401242140000 198401242145000 >198401242210000 198401242214000 >198401242310000 198401251240000 >198401251248000 198401251515000 >198401251524000 198401251701000 >198401251713000 198401260333420 >198401260342180 198401260349180 >198401260355120 198401260627360 >198401260643000 198401260651360 >198401260702240 198401260803180 >198401260810420 198401261203180 >198401261216300 198401261318420 >198401261330420 198401261444540 >198401261452180 198401261525120 >198401261539540 198401261550300 >198401261609300 198401261625120 >198401261635060 198401261641540 >198401261649240 198401261813540 >198401261829240 198401262036420 >198401262051420 198401262104420 >198401262111300 198401262118060 >198401262126060 198401262152300 >198401262200060 198401262207540 >198401262217420 198401262255300 >198401262303540 198401262314540 >198401262320360 198401262346420 >198401262354480 198401270000000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Seismic Shots Data (l-1-84-an.420_070) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198401150640030 198401160539400 >198401160620120 198401160923560 >198401161100110 198401170804420 >198401170848150 198401171407500 >198401171505290 198401180704590 >198401180805040 198401181534590 >198401181605170 198401182127360 >198401182146280 198401190629500 >198401190720160 198401200144560 >198401200210130 198401200604440 >198401200638100 198401202244510 >198401202310040 198401210532260 >198401210610150 198401211829490 >198401211910190 198401221830030 >198401221905050 198401230046300 >198401230745030 198401231934530 >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. > >09/03/85 CAROLYN DUA0:[DATA.L184AN.N]L184AN.070; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >Input was... >03/14/85 KAYE USR$DISK:[DRS.DATA.L1.N]NEW.054; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 >
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/l184an/grav/l-1-84-an.155_070 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >11/26/85 BARB DUA0:[DATA.L184AN.G]L184AN.155; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >editing, skipnsave, and eotvos corrections made by Jon Childs > >Input was... >Converted to time format with year at start. > >09/03/85 CAROLYN DUA0:[DATA.L184AN.N]L184AN.070; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >03/14/85 KAYE USR$DISK:[DRS.DATA.L1.N]NEW.054; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 > >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-1-84-an.260_070 > >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/l184an/mag/l-1-84-an.240_070 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >03/21/85 CAROLYN USR$DISK:[DRS.DATA.L184AN.M]L184AN.240; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 >013/2348-029/0813 was L14M10.201 >029/0945-030/0432 was L14M11.201 > >Converted to time format with year at start. > >09/03/85 CAROLYN DUA0:[DATA.L184AN.N]L184AN.070; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >03/14/85 KAYE USR$DISK:[DRS.DATA.L1.N]NEW.054; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 > >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/l184an/bath/l-1-84-an.330_070 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >05/01/85 BECKIE USR$DISK:[DRS.DATA.L184AN.B]L184AN.330; >DRA1:[DRS.REFMT]REFORMAT.EXE;4 >Bathymetry is edited digitrack data. > >Input was... >Converted to time format with year at start. > >09/03/85 CAROLYN DUA0:[DATA.L184AN.N]L184AN.070; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >03/14/85 KAYE USR$DISK:[DRS.DATA.L1.N]NEW.054; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 > >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
Spatial_Data_Organization_Information:
Indirect_Spatial_Reference: Antarctica
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: l184an.m77t
Entity_Type_Definition:
MGD77T single-beam bathymetry, gravity, and magnetics data file for L184AN
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: 19840104
Range_Domain_Maximum: 19840201
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: 2359.766
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: -77.10433
Range_Domain_Maximum: -43.58359
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: 129.74580
Range_Domain_Maximum: 173.18375
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: 0.16
Range_Domain_Maximum: 6.084
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: 120
Range_Domain_Maximum: 4530
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: 57621
Range_Domain_Maximum: 67439
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: 65241.3
Range_Domain_Maximum: 67436
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: -8899.5
Range_Domain_Maximum: 736.1
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: 980572.5
Range_Domain_Maximum: 982386.8
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: -38.2
Range_Domain_Maximum: 29.3
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: -117.3
Range_Domain_Maximum: 236.6
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: 14B
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: 41
Range_Domain_Maximum: 4687
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 L1824AN 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: 3.6
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information: Access_Instructions: Data are available for download on the World Wide Web (WWW).
Fees: None
Metadata_Reference_Information:
Metadata_Date: 20170201
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

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