l776bs.m77t - MGD77 data file for Geophysical data from field activity L-7-76-BS in Bering Sea, Alaska from 09/03/1976 to 09/10/1976

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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:
l776bs.m77t - MGD77 data file for Geophysical data from field activity L-7-76-BS in Bering Sea, Alaska from 09/03/1976 to 09/10/1976
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/l776bs/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-7-76-BS in Bering Sea, Alaska from 09/03/1976 to 09/10/1976, http://walrus.wr.usgs.gov/infobank/l/l776bs/html/l-7-76-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/l776bs/html/l-7-76-bs.bath.html, http://walrus.wr.usgs.gov/infobank/l/l776bs/html/l-7-76-bs.grav.html, and http://walrus.wr.usgs.gov/infobank/l/l776bs/html/l-7-76-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: 19760903
Ending_Date: 19760910
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -176.63771
East_Bounding_Coordinate: -165.40160
North_Bounding_Coordinate: 64.48392
South_Bounding_Coordinate: 51.85725
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:7f75b60a-dde6-4853-a473-b4a474b3a244
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: 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-7-76-bs.011 [DRS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197609032243400 197609061839000 >197609061848400 197609061939000 >197609062013500 197609062132000 >197609062203100 197609080945400 >197609080955100 197609081955500 >197609082205100 197609090330400 >197609090420000 197609091931100 >197609092001400 197609101518500 >197609101530400 197609101535300 >197609101633200 197609101633200 >197609101725300 197609101903300 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (l-7-76-bs.165_011) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197609032243420 197609040247420 >197609040630180 197609061455120 >197609061500300 197609061835000 >197609061844420 197609061850420 >197609062216120 197609080940420 >197609080950120 197609081156000 >197609081201180 197609081929480 >197609090001120 197609090325420 >197609090416000 197609091926120 >197609091957420 197609101513480 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (l-7-76-bs.220_011) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197609032243400 197609040612100 >197609050047400 197609061840200 >197609061848400 197609061940400 >197609062013500 197609062133200 >197609062203100 197609080947200 >197609080955100 197609081956500 >197609082205100 197609101519500 >197609101725300 197609101903300 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-7-76-bs.335_011) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197609032335000 197609032335000 >197609032359000 197609032359000 >197609040030000 197609040030000 >197609040116000 197609040116000 >197609040156000 197609040156000 >197609040240000 197609040240000 >197609040334000 197609040334000 >197609040425000 197609040425000 >197609040527000 197609040527000 >197609040600000 197609040958000 >197609041012000 197609041012000 >197609041030000 197609041104000 >197609041127000 197609041300000 >197609041313000 197609041451000 >197609041504000 197609042159000 >197609042220000 197609051630000 >197609051702000 197609061800000 >197609062102000 197609062102000 >197609062113000 197609062231000 >197609062310000 197609072230000 >197609072241000 197609080432000 >197609080636000 197609081046000 >197609081747000 197609081805000 >197609081821000 197609081849000 >197609081904000 197609081904000 >197609081917000 197609081917000 >197609081933000 197609081941000 >197609081953000 197609082002000 >197609082013000 197609082133000 >197609082144000 197609082144000 >197609082156000 197609082156000 >197609082211000 197609082211000 >197609082224000 197609082224000 >197609082237000 197609082237000 >197609082249000 197609082306000 >197609082319000 197609082339000 >197609082355000 197609082355000 >197609090012000 197609090012000 >197609090027000 197609090027000 >197609090040000 197609090040000 >197609090054000 197609090054000 >197609090107000 197609090107000 >197609090119000 197609090139000 >197609090151000 197609090151000 >197609090202000 197609090202000 >197609090218000 197609090223000 >197609090239000 197609090239000 >197609090254000 197609090254000 >197609090309000 197609090309000 >197609090326000 197609090326000 >197609090403000 197609090403000 >197609090419000 197609090419000 >197609090431000 197609090431000 >197609090445000 197609090445000 >197609090503000 197609090503000 >197609090521000 197609090610000 >197609090621000 197609090621000 >197609090632000 197609090632000 >197609090643000 197609090656000 >197609090707000 197609090707000 >197609090719000 197609090719000 >197609090731000 197609090806000 >197609090817000 197609090843000 >197609090854000 197609090854000 >197609090905000 197609090905000 >197609090918000 197609090937000 >197609090950000 197609090950000 >197609091004000 197609091004000 >197609091015000 197609091026000 >197609091038000 197609091038000 >197609091051000 197609091051000 >197609091102000 197609091102000 >197609091118000 197609091118000 >197609091132000 197609091132000 >197609091149000 197609091149000 >197609091200000 197609091208000 >197609091219000 197609091229000 >197609091240000 197609091240000 >197609091252000 197609091335000 >197609091352000 197609091409000 >197609091420000 197609091420000 >197609091434000 197609091458000 >197609091514000 197609091522000 >197609091534000 197609091544000 >197609091555000 197609091555000 >197609091607000 197609091607000 >197609091621000 197609091621000 >197609091633000 197609091633000 >197609091645000 197609091645000 >197609091659000 197609091659000 >197609091713000 197609091713000 >197609091728000 197609091738000 >197609091753000 197609091809000 >197609091824000 197609091824000 >197609091835000 197609091844000 >197609091856000 197609091916000 >197609092048000 197609092116000 >197609092129000 197609092129000 >197609092141000 197609092141000 >197609092158000 197609092158000 >197609092216000 197609092216000 >197609092234000 197609092234000 >197609092250000 197609092250000 >197609092305000 197609092308000 >197609092320000 197609092336000 >197609092349000 197609092349000 >197609100005000 197609100005000 >197609100020000 197609100020000 >197609100038000 197609100038000 >197609100057000 197609100057000 >197609100114000 197609100114000 >197609100137000 197609100137000 >197609100157000 197609100157000 >197609100221000 197609100221000 >197609100234000 197609100250000 >197609100304000 197609100338000 >197609100352000 197609100519000 >197609100546000 197609100615000 >197609100651000 197609100851000 >197609100917000 197609100929000 >197609100946000 197609101020000 >197609101035000 197609101039000 >197609101051000 197609101053000 >197609101105000 197609101107000 >197609101118000 197609101120000 >197609101132000 197609101149000 >197609101200000 197609101223000 >197609101235000 197609101236000 >197609101247000 197609101304000 >197609101318000 197609101320000 >197609101336000 197609101540000 >197609101553000 197609101654000 >197609101707000 197609101721000 >197609101733000 197609101740000 >197609101751000 197609101818000 >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.L776BS.N]L776BS.011; >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/l776bs/grav/l-7-76-bs.165_011 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >05/02/86 CLINT DUA0:[DATA.L776BS]L776BS.165; >DRB0:[CLINT]REFMTJCGRV.EXE; >reformated from JChilds file l776.smgrv > >Input was... >Converted to time format with year at start. > >01/31/86 KAYE DUA0:[DATA.L776BS.N]L776BS.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 >06/20/2012 carolyn l-7-76-bs.220_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/l776bs/mag/l-7-76-bs.200_011 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >01/03/86 CAROLYN DRS$DATA:[L776BS.M]L776BS.200; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 >from Barb from grvsd1 from VAM087 - couldn't read second mag field >253/0332-253/0418 & 253/1932-253/2000 from L776BS.DRCPE1.MAGSD1 on TAM087 > also was L776BS240.DAT on VAM087 > >Converted to time format with year at start. > >01/31/86 KAYE DUA0:[DATA.L776BS.N]L776BS.011; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >time, lat, long, time(sec) to nearest nav fix, data values
Process_Date: 20120620
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
Contact_Person: Carolyn H. Degnan
Contact_Position: Geophysicist
Contact_Address:
Address_Type: mailing and physical address
Address:
USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060-5792
Country: USA
Contact_Voice_Telephone: (831) 460-7452
Contact_Facsimile_Telephone: (831) 427-4748
Contact_Electronic_Mail_Address: infobank@octopus.wr.usgs.gov
Process_Step:
Process_Description:
Bathymetry Data >10/31/1998 /tiger/l/l776bs/bath/l-7-76-bs.335_011 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >02/11/86 BECKIE DISK$USERDISK:[BECKIE.TEMP]L776BS.335; >DRB0:[DRS.BAT]BATRED.EXE;1 >Velocity of sound assumed in reduction: 1500m/sec >for 2-way traveltime. > >02/11/86 BECKIE DISK$USERDISK:[BECKIE.TEMP]L776BS.310; >DRB0:[DRS.NGDC]UNREFNGDC.EXE; >This file was hand-digetized in 2-way traveltime(secs). > >Input was... >Converted to time format with year at start. > >01/31/86 KAYE DUA0:[DATA.L776BS.N]L776BS.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: 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: l776bs.m77t
Entity_Type_Definition:
MGD77T single-beam bathymetry, gravity, and magnetics data file for L776BS
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: 19760903
Range_Domain_Maximum: 19760910
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: 51.85735
Range_Domain_Maximum: 64.48387
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: -176.63768
Range_Domain_Maximum: -165.40173
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: 0.019
Range_Domain_Maximum: 5.005
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: 14.2
Range_Domain_Maximum: 3727.8
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: 46696.5
Range_Domain_Maximum: 58847.5
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: -2185.1
Range_Domain_Maximum: 9650.8
Attribute_Units_of_Measure: gammas
Attribute:
Attribute_Label: GRA_OBS
Attribute_Definition: Observed gravity
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 981258.4
Range_Domain_Maximum: 982257.1
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: -13.9
Range_Domain_Maximum: 0.1
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: -58.9
Range_Domain_Maximum: 134.2
Attribute_Units_of_Measure: milligals
Overview_Description:
Entity_and_Attribute_Overview:
Bathymetry, gravity, magnetic, and navigation data for U.S. Geological Survey bathymetry survey L776BS 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: .827
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://www.ngdc.noaa.gov/mgg/trk/trackline/samuel_p._lee/l776bs/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
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/SeriesReports/OFR/OFR_89-167/872.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:18:25 2021