l981aa.m77t - MGD77 data file for Geophysical data from field activity L-9-81-AA in Aleutian Arc, Alaska from 07/19/1981 to 08/13/1981

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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:
l981aa.m77t - MGD77 data file for Geophysical data from field activity L-9-81-AA in Aleutian Arc, Alaska from 07/19/1981 to 08/13/1981
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/l981aa/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, magnetics, and gravity data along with transit satellite navigation data was collected as part of field activity L-9-81-AA in Aleutian Arc, Alaska from 07/19/1981 to 08/13/1981, http://walrus.wr.usgs.gov/infobank/l/l981aa/html/l-9-81-aa.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/l981aa/html/l-9-81-aa.bath.html http://walrus.wr.usgs.gov/infobank/l/l981aa/html/l-9-81-aa.grav.html http://walrus.wr.usgs.gov/infobank/l/l981aa/html/l-9-81-aa.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: 19810719
Ending_Date: 19810813
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: 173.58301
East_Bounding_Coordinate: -165.99205
North_Bounding_Coordinate: 54.08144
South_Bounding_Coordinate: 50.11441
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:d9498f86-e298-4e57-aa9a-961085023398
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificinformation
Theme_Keyword: oceans
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Marine Geology
Theme_Keyword: Marine Geophysics
Theme_Keyword: Single-beam Bathymetry
Theme_Keyword: Water Depth
Theme_Keyword: Seafloor Topography
Theme_Keyword: Marine Seismic
Theme_Keyword: Marine Gravity
Theme_Keyword: Marine Magnetics
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: none
Place_Keyword: AK
Place_Keyword: Alaska
Place_Keyword: Aleutian Arc
Place_Keyword: Aleutian Arc, Alaska
Place_Keyword: Aleutians
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: Dave Scholl, Tracy Vallier(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-9-81-aa.070) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198107190212000 198107201108000 >198107201117000 198107201649260 >198107201654360 198107240505200 >198107240533190 198108100623120 >198108100629050 198108131805000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (l-9-81-aa.165_070) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198107190226000 198107191506480 >198107191515000 198107200834420 >198107200844060 198107201713240 >198107201721540 198107210201540 >198107210207060 198107220431240 >198107220437540 198107221335180 >198107221437060 198107230816360 >198107230822060 198107260508240 >198107260515060 198107261854300 >198107261904300 198107270358300 >198107270405060 198107280617420 >198107280623180 198107300818000 >198107300823420 198107302338120 >198107310226480 198107311039000 >198107311044420 198107311846420 >198107312049060 198108010036180 >198108011032240 198108011810120 >198108020548240 198108021051240 >198108021100300 198108031253120 >198108031259060 198108031357120 >198108031428000 198108031855300 >198108032204360 198108040707540 >198108040714120 198108061331420 >198108061337060 198108070714540 >198108070720000 198108080919000 >198108080925120 198108090505480 >198108090511060 198108110414420 >198108110420180 198108120846480 >198108120943000 198108131742180 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (l-9-81-aa.220_070) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198107190800000 198107191512070 >198107191520030 198107200840000 >198107200849080 198107200941560 >198107201633160 198107201718360 >198107201726520 198107210207000 >198107210212080 198107220436560 >198107220442520 198107221340320 >198107221442060 198107230821560 >198107230827040 198107260514000 >198107260520040 198107261900000 >198107261909320 198107270404000 >198107270410040 198107280328100 >198107280514400 198107280623000 >198107280628160 198107280827240 >198107282256360 198107290141400 >198107291204400 198107292022040 >198107300334400 198107301240080 >198107301921440 198107302256160 >198107310232160 198107310915240 >198107312054050 198108010041040 >198108011039070 198108011814510 >198108020553270 198108021057070 >198108021105310 198108031402400 >198108031433030 198108031900320 >198108032209360 198108040713000 >198108040719120 198108042338400 >198108050854400 198108051705160 >198108060916400 198108061337000 >198108061342040 198108080924200 >198108080930140 198108082258280 >198108090114200 198108092221440 >198108100038240 198108100539160 >198108100821280 198108110419560 >198108110425160 198108112310080 >198108120135090 198108120852280 >198108120948000 198108121339000 >198108121712230 198108131045000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-9-81-aa.335_070) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198107190300060 198107190924360 >198107190939180 198107191007300 >198107191020300 198107201215060 >198107201247300 198107201801480 >198107201812240 198107220000000 >198107220150360 198107280300000 >198107280527180 198107280829060 >198107282303120 198107290131420 >198107290630000 198107301458180 >198107301509180 198107301518120 >198107301528180 198107301528180 >198107301538420 198107310915240 >198107311000060 198108010034540 >198108011042420 198108011833540 >198108020601000 198108042338060 >198108050904180 198108051848000 >198108060955240 198108061704180 >198108061716180 198108070022120 >198108070059540 198108070343300 >198108070357300 198108070400540 >198108070413540 198108071800000 >198108071831180 198108080333120 >198108080344060 198108081108060 >198108081205060 198108082230060 >198108082241120 198108112300060 >198108112311540 198108121338300 >198108121700120 198108131040360 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Seismic Shots Data (l-9-81-aa.421_070) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198107201802220 198107220000060 >198107220145060 198107221720110 >198107221940110 198107231354470 >198107231502070 198107241036120 >198107241130120 198107250221110 >198107250250310 198107250325520 >198107250349520 198107251319520 >198107251353120 198107260210140 >198107260216540 198107261053340 >198107261205140 198107270851500 >198107271310100 198107280253350 >198108060958150 198108062358190 >198108070055190 198108080252180 >198108080258580 198108080515390 >198108080540390 198108081137190 >198108081208190 198108081718160 >198108081724560 198108082231350 >198108100823460 198108101352280 >198108101357390 198108110016060 >198108110032270 198108110055080 >198108110100310 198108110100310 >198108110106460 198108110106460 >198108110113250 198108110113250 >198108110120020 198108110120020 >198108110127340 198108110127340 >198108110135550 198108110135550 >198108110142460 198108110147400 >198108110152500 198108110152500 >198108110158320 198108110230210 >198108110235310 198108110537260 >198108110607470 198108111406020 >198108111411390 198108111715540 >198108111721220 198108112301430 >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. > >06/06/86 EDM DUA0:[DATA.LEE81B]L981AA.070; >DUA0:[DATA.LEE81B]FIXLATLON.EXE; >fixed longitude values less than -180 degrees > >Input was... >06/24/85 CAROLYN DRS$DATA:[L981AA.N]L981AA.070; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >06/24/85 CAROLYN DRS$DATA:[L981AA.N]L981AA.050; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 >was l981aa.sinse1._ on TAM295 and on TAM339 >
Process_Date: 19960122
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
Contact_Person: Clint Steele
Contact_Position: InfoBank Group Leader
Contact_Address:
Address_Type: mailing and physical address
Address: USGS, MailStop 999, 345 Middlefield Road
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025-3561
Country: USA
Contact_Voice_Telephone: (650) 329-5055
Contact_Facsimile_Telephone: (650) 329-5190
Contact_Electronic_Mail_Address: infobank@octopus.wr.usgs.gov
Process_Step:
Process_Description:
Gravity Data >10/31/1998 /tiger/l/l981aa/grav/l-9-81-aa.165_070 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >04/14/86 BECKIE DUA0:[DATA.JON.L981AA]L981AA.165; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 >This file was a Multics file named l981aa.red_grv. >Jon Childs believes this file to be superior to >L981AA.161, which has regional value problems. > >Input was... >Converted to time format with year at start. > >06/06/86 EDM DUA0:[DATA.LEE81B]L981AA.070; >DUA0:[DATA.LEE81B]FIXLATLON.EXE; >fixed longitude values less than -180. degrees > >06/24/85 CAROLYN DRS$DATA:[L981AA.N]L981AA.070; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >06/24/85 CAROLYN DRS$DATA:[L981AA.N]L981AA.050; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 >was l981aa.sinse1._ on TAM295 and on TAM339 > >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: Clint Steele
Contact_Position: InfoBank Group Leader
Contact_Address:
Address_Type: mailing and physical address
Address: USGS, MailStop 999, 345 Middlefield Road
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025-3561
Country: USA
Contact_Voice_Telephone: (650) 329-5055
Contact_Facsimile_Telephone: (650) 329-5190
Contact_Electronic_Mail_Address: infobank@octopus.wr.usgs.gov
Process_Step:
Process_Description:
Magnetics Data >06/20/2012 carolyn l-9-81-aa.220_070 > >Reprocessed using subroutines from Susan Macmillan's >IGRF SYNTHESIS PROGRAM >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/l981aa/mag/l-9-81-aa.200_070 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >11/21/85 CAROLYN DRS$DATA:[L981AA.M]L981AA.200; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 >was L981AA._.MAGSB1 on TAM002 >was L981AA220.DAT on VAM002 > >Converted to time format with year at start. > >06/06/86 EDM DUA0:[DATA.LEE81B]L981AA.070; >DUA0:[DATA.LEE81B]FIXLATLON.EXE; >fixed longitude values less than -180. degrees > >06/24/85 CAROLYN DRS$DATA:[L981AA.N]L981AA.070; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >06/24/85 CAROLYN DRS$DATA:[L981AA.N]L981AA.050; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 >was l981aa.sinse1._ on TAM295 and on TAM339 > >time, lat, long, time(sec) to nearest nav fix, data values
Process_Date: 20120620
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
Contact_Person: Clint Steele
Contact_Position: InfoBank Group Leader
Contact_Address:
Address_Type: mailing and physical address
Address: USGS, MailStop 999, 345 Middlefield Road
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025-3561
Country: USA
Contact_Voice_Telephone: (650) 329-5055
Contact_Facsimile_Telephone: (650) 329-5190
Contact_Electronic_Mail_Address: infobank@octopus.wr.usgs.gov
Process_Step:
Process_Description:
Bathymetry Data >10/31/1998 /tiger/l/l981aa/bath/l-9-81-aa.335_070 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >09/04/85 BECKIE DUA0:[DATA.L981AA.B]L981AA.335; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 >This file was hand-digetized in 2-way traveltime(secs). > >Input was... >Converted to time format with year at start. > >06/06/86 EDM DUA0:[DATA.LEE81B]L981AA.070; >DUA0:[DATA.LEE81B]FIXLATLON.EXE; >fixed longitude values less than -180. degrees > >06/24/85 CAROLYN DRS$DATA:[L981AA.N]L981AA.070; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >06/24/85 CAROLYN DRS$DATA:[L981AA.N]L981AA.050; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 >was l981aa.sinse1._ on TAM295 and on TAM339 > >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: Clint Steele
Contact_Position: InfoBank Group Leader
Contact_Address:
Address_Type: mailing and physical address
Address: USGS, MailStop 999, 345 Middlefield Road
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025-3561
Country: USA
Contact_Voice_Telephone: (650) 329-5055
Contact_Facsimile_Telephone: (650) 329-5190
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: Aleutian Arc, 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: l981aa.m77t
Entity_Type_Definition:
MGD77T single-beam bathymetry, gravity, and magnetics data file for l981aa
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: 19810719
Range_Domain_Maximum: 19810813
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: 2359.866
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: 50.11443
Range_Domain_Maximum: 54.08144
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: -179.99889
Range_Domain_Maximum: 179.99854
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: 0.045
Range_Domain_Maximum: 9.645
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: 33.8
Range_Domain_Maximum: 7325.7
Attribute_Units_of_Measure: decimal meters
Attribute:
Attribute_Label: BAT_CPCO
Attribute_Definition:
Bathymetric Correction code - details the procedure used for determining the sound velocity correction to depth
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 63
Range_Domain_Maximum: 63
Attribute_Units_of_Measure:
01-55 Matthews' Zones with zone , 59 Matthews' Zones, no zone specified, 60 S. Kuwahara Formula, 61 Wilson Formula, 62 Del Grosso Formula, 63 Carter's Tables, 88 Other (see Add. Doc.), 97 Computed using 1500 meters/sec, 98 Unknown if Corrected, 99 Unspecified
Attribute:
Attribute_Label: BAT_TYPCO
Attribute_Definition:
Bathymetry type code - indicates how the bathymetric value was obtained
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 3
Attribute_Units_of_Measure:
1 - Observed, 3 - Interpolated (Header Seq. 12), 9 - Unspecified
Attribute:
Attribute_Label: MAG_TOT
Attribute_Definition: Magnetics total field - 1st sensor
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 45788
Range_Domain_Maximum: 54274
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: -2734.6
Range_Domain_Maximum: 5653.7
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: 980472.1
Range_Domain_Maximum: 981786.4
Attribute_Units_of_Measure: milligals
Attribute:
Attribute_Label: EOTVOS
Attribute_Definition:
EOTVOS correction - E = 7.5 V cos(phi) * sin(alpha) + 0.0042 V*V
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -53.9
Range_Domain_Maximum: 54.2
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: -744.5
Range_Domain_Maximum: 567.8
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: 4
Range_Domain_Maximum: 39
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: 5414
Attribute_Units_of_Measure:
Used, for example, to cross reference with seismic data.
Overview_Description:
Entity_and_Attribute_Overview:
Bathymetry, magnetic, gravity, and navigation data for U.S. Geological Survey survey l981aa in MGD77T format.
Entity_and_Attribute_Detail_Citation:
Attributes are obtained from MGD77T data files created from the navigation, gravity, magnetics 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: 3.8
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://www.ngdc.noaa.gov/mgg/trk/trackline/samuel_p._lee/l981aa/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_89-167/1320.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:17:53 2021