l777wg.m77t - MGD77 data file for Geophysical data from field activity L-7-77-WG in Western Gulf of Alaska from 07/03/1977 to 07/22/1977

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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:
l777wg.m77t - MGD77 data file for Geophysical data from field activity L-7-77-WG in Western Gulf of Alaska from 07/03/1977 to 07/22/1977
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/l777wg/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-7-77-WG in Western Gulf of Alaska from 07/03/1977 to 07/22/1977, http://walrus.wr.usgs.gov/infobank/l/l777wg/html/l-7-77-wg.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/l777wg/html/l-7-77-wg.bath.html, http://walrus.wr.usgs.gov/infobank/l/l777wg/html/l-7-77-wg.grav.html, and http://walrus.wr.usgs.gov/infobank/l/l777wg/html/l-7-77-wg.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: 19770703
Ending_Date: 19770722
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -156.74424
East_Bounding_Coordinate: -147.44074
North_Bounding_Coordinate: 58.14343
South_Bounding_Coordinate: 54.97198
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:2b6ae05d-749d-4db1-907d-c9cb9f87caf1
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: USA
Place_Keyword: Western Gulf of Alaska
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: Roland Von Huene (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-7-77-wg.010 [DRS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197707031548000 197707042202100 >197707042248100 197707051200500 >197707051207000 197707051316000 >197707051325400 197707052015400 >197707052025100 197707060404100 >197707060414100 197707061243200 >197707061248400 197707062228400 >197707062235200 197707070726200 >197707070736200 197707091829500 >197707091844300 197707091844300 >197707091859300 197707091859300 >197707091914300 197707091914300 >197707091929300 197707091929300 >197707091944300 197707091944300 >197707091959300 197707091959300 >197707092014300 197707092014300 >197707092029300 197707092029300 >197707092044300 197707092044300 >197707092100100 197707092144300 >197707092158100 197707100059300 >197707100104500 197707100812500 >197707100827300 197707100827300 >197707100842300 197707100842300 >197707100857300 197707100857300 >197707100912300 197707100912300 >197707100927300 197707100927300 >197707100942300 197707100942300 >197707100957300 197707100957300 >197707101012300 197707101012300 >197707101027300 197707101027300 >197707101042300 197707101042300 >197707101054200 197707101759400 >197707101824500 197707132130100 >197707132140400 197707151438300 >197707151449300 197707151624500 >197707151634300 197707170126100 >197707170232100 197707170330100 >197707170346100 197707170649300 >197707170718100 197707170802100 >197707170814100 197707171338100 >197707171346100 197707171406100 >197707171414100 197707171422100 >197707171436100 197707171522100 >197707171537000 197707171537000 >197707171552000 197707171552000 >197707171607000 197707171607000 >197707171622000 197707171622000 >197707171637000 197707171637000 >197707171652000 197707171652000 >197707171707000 197707171707000 >197707171722000 197707171722000 >197707171737000 197707171737000 >197707171752000 197707171752000 >197707171807000 197707171807000 >197707171822000 197707171822000 >197707171837000 197707171837000 >197707171854000 197707172208200 >197707172214000 197707172217000 >197707172228200 197707172331400 >197707172354000 197707181451100 >197707181527100 197707181933300 >197707181950500 197707182020500 >197707182029300 197707190540500 >197707190550300 197707190637100 >197707190643100 197707190659100 >197707190750500 197707191600100 >197707191615000 197707191615000 >197707191630000 197707191630000 >197707191645000 197707191645000 >197707191700100 197707191747300 >197707191811500 197707191928500 >197707191936100 197707192024100 >197707192030500 197707192042300 >197707192050500 197707200009100 >197707200015100 197707200134500 >197707200144300 197707200314500 >197707200324100 197707201239300 >197707201316500 197707201335500 >197707201355300 197707210117500 >197707210128100 197707210218300 >197707210227500 197707210304300 >197707210310100 197707210445100 >197707210454100 197707210546500 >197707210554100 197707210627500 >197707210646300 197707211252100 >197707211326500 197707212304300 >197707212310300 197707212358100 >197707220010200 197707221023400 >197707221031000 197707221736000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (l-7-77-wg.162_010) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197707031548400 197707042156300 >197707042216100 197707051151100 >197707051157000 197707052005400 >197707052015100 197707062219000 >197707062225200 197707092134300 >197707092148100 197707100802500 >197707101034230 197707101750000 >197707101814500 197707132120100 >197707132130400 197707172207000 >197707172218200 197707212348100 >197707220000200 197707221736000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (l-7-77-wg.260_010) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197707061130210 197707070005030 >197707070735000 197707080409160 >197707081118250 197707081303500 >197707081329370 197707081840220 >197707081901290 197707090408300 >197707090544060 197707092157060 >197707092209180 197707100812300 >197707101043000 197707101633000 >197707110412540 197707110413540 >197707110427300 197707111319180 >197707111550300 197707130815360 >197707130826240 197707131757300 >197707131804420 197707140450000 >197707141541420 197707150617480 >197707171000120 197707171825360 >197707221023000 197707221036180 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-7-77-wg.335_010) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197707031830000 197707032200000 >197707032340000 197707040700000 >197707040745000 197707050255000 >197707050310000 197707050455000 >197707050719000 197707050805000 >197707050820000 197707060005000 >197707060025000 197707060225000 >197707061100000 197707061650000 >197707061705000 197707061720000 >197707061740000 197707061747000 >197707061830000 197707070330000 >197707070600000 197707071345000 >197707071410000 197707071720000 >197707071736000 197707072030000 >197707072055000 197707081010000 >197707081030000 197707090320000 >197707090345000 197707090400000 >197707090415000 197707090645000 >197707090710000 197707090820000 >197707090855000 197707092300000 >197707092320000 197707100715000 >197707100730000 197707101630000 >197707101910000 197707111215000 >197707111230000 197707130150000 >197707130210000 197707140710000 >197707140730000 197707142140000 >197707142155000 197707150041480 >197707150054420 197707150108480 >197707150120360 197707150153480 >197707150213480 197707150213480 >197707150225000 197707150243360 >197707150256120 197707150309120 >197707150320300 197707150329540 >197707150340000 197707150340000 >197707150353180 197707150939300 >197707150950000 197707151050000 >197707151110000 197707151110000 >197707151217540 197707151217540 >197707151230000 197707151236000 >197707151257240 197707151257240 >197707151322540 197707151329540 >197707151341300 197707160456480 >197707160507060 197707160507060 >197707160520000 197707160745300 >197707160801180 197707160801180 >197707191000000 197707191445000 >197707191500000 197707191920000 >197707191940000 197707200100000 >197707200115000 197707200210000 >197707200230000 197707200235000 >197707200250000 197707200327000 >197707200340000 197707200410000 >197707200427000 197707200427000 >197707200440000 197707200447000 >197707200500000 197707200505000 >197707200516000 197707200523000 >197707200535000 197707200540000 >197707200555000 197707200615000 >197707200630000 197707200705000 >197707200720000 197707200900000 >197707200930000 197707200930000 >197707200945000 197707200945000 >197707201000000 197707201000000 >197707201012000 197707201017000 >197707201030000 197707201100000 >197707201115000 197707201115000 >197707201130000 197707201335000 >197707201350000 197707201405000 >197707201420000 197707201640000 >197707201653000 197707201850000 >197707201903000 197707201903000 >197707201920000 197707202046000 >197707202100000 197707202317000 >197707202330000 197707210000000 >197707210012000 197707210215000 >197707210230000 197707210339000 >197707210350000 197707210356000 >197707210410000 197707210410000 >197707210433000 197707210544000 >197707210555000 197707210630000 >197707210644000 197707210836000 >197707210850000 197707210935000 >197707210950000 197707211000000 >197707211012000 197707211020000 >197707211040000 197707211047000 >197707211100000 197707211110000 >197707211130000 197707211335000 >197707211350000 197707211630000 >197707211710000 197707211724000 >197707211740000 197707211835000 >197707211850000 197707212340000 >197707220520000 197707220540000 >197707220553000 197707220830000 >197707220845000 197707220845000 >197707220900000 197707220900000 >197707220915000 197707220915000 >197707220930000 197707220930000 >197707220945000 197707220945000 >197707221000000 197707221000000 >197707221015000 197707221015000 >197707221030000 197707221030000 >197707221045000 197707221045000 >197707221100000 197707221100000 >197707221115000 197707221115000 >197707221130000 197707221130000 >197707221145000 197707221145000 >197707221200000 197707221200000 >197707221215000 197707221215000 >197707221230000 197707221230000 >197707221245000 197707221245000 >197707221300000 197707221300000 >197707221315000 197707221315000 >197707221330000 197707221330000 >197707221345000 197707221345000 >197707221400000 197707221400000 >197707221415000 197707221415000 >197707221430000 197707221430000 >197707221445000 197707221445000 >197707221500000 197707221500000 >197707221515000 197707221515000 >197707221530000 197707221530000 >197707221545000 197707221545000 >197707221600000 197707221600000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Seismic Shots Data (l-7-77-wg.420_010) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197707061100210 197707070325080 >197707070558150 197707070728140 >197707070733370 197707071336440 >197707071950570 197707080355470 >197707080755150 197707081254550 >197707081301140 197707081808290 >197707081815120 197707082158570 >197707090158110 197707090257230 >197707090302290 197707090746210 >197707090756520 197707091509230 >197707091707160 197707100550520 >197707100805290 197707101623560 >197707101907040 197707102036320 >197707102043160 197707102355130 >197707110243110 197707111311540 >197707111838540 197707112208070 >197707112214490 197707121827510 >197707122050130 197707122225290 >197707122232530 197707130044240 >197707130200140 197707130406360 >197707130413320 197707130837310 >197707130857080 197707131057360 >197707131120150 197707131857490 >197707131903050 197707140039400 >197707140046040 197707140058080 >197707140655040 197707140710360 >197707140716580 197707140936270 >197707141000240 197707141146030 >197707141151080 197707141504370 >197707141512110 197707141617210 >197707141653470 197707150001390 >197707150015300 197707150029360 >197707150035400 197707150542570 >197707150549000 197707150602150 >197707150746130 197707150840030 >197707150919540 197707150935580 >197707150941190 197707151125240 >197707151201390 197707151845210 >197707151851240 197707151912500 >197707152007500 197707152023410 >197707152029550 197707152250210 >197707160003450 197707160003450 >197707160010160 197707160724560 >197707180837030 197707181644030 >197707181649280 197707181951060 >197707182200200 197707190806230 >197707190901100 197707191058320 >197707191200170 197707191807130 >197707191951210 197707200624040 >197707200911230 197707201323270 >197707201415000 197707210229170 >197707210522200 197707210815360 >197707211113310 197707211439190 >197707211820470 197707211827080 >197707211833190 197707212343230 >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. > >01/24/86 KAYE DUA0:[DATA.L777WG.N]L777WG.010; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 >
Process_Date: 19960119
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
Contact_Person: Carolyn H. Degnan
Contact_Position: Geophysicist
Contact_Address:
Address_Type: mailing and physical address
Address:
USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060-5792
Country: USA
Contact_Voice_Telephone: (831) 460-7452
Contact_Facsimile_Telephone: (831) 427-4748
Contact_Electronic_Mail_Address: infobank@octopus.wr.usgs.gov
Process_Step:
Process_Description:
Gravity Data >10/31/1998 /tiger/l/l777wg/grav/l-7-77-wg.162_010 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >04/25/88 BECKIE DUA0:[DATA.L476WG]L777WG.162; >DUA0:[DRS.GRV]GRAVRED.EXE;4 >Free Air Anomaly data > >11/27/85 BARB DUA0:[DATA.L777WG.G]L777WG.140 >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >0.9948 S53 > >12/23/85 BARB DUA0:[DATA.L777WG.G]L777WG.111; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >12/23/85 BARB DUA0:[DATA.L777WG.G]L777WG.111 >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >04/18/88 BECKIE DUA0:[DATA.L476WG]L777WG.070; >DUA0:[DRS.NAV]EOTCSSP.EXE;1 >Eotvos/course/speed/distance data > >01/24/86 KAYE DUA0:[DATA.L777WG.N]L777WG.010; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >Input was... >Converted to time format with year at start. > >01/24/86 KAYE DUA0:[DATA.L777WG.N]L777WG.010; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >time, lat, long, time(sec) to nearest nav fix, data values
Process_Date: 19981031
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
Contact_Person: Carolyn H. Degnan
Contact_Position: Geophysicist
Contact_Address:
Address_Type: mailing and physical address
Address:
USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060-5792
Country: USA
Contact_Voice_Telephone: (831) 460-7452
Contact_Facsimile_Telephone: (831) 427-4748
Contact_Electronic_Mail_Address: infobank@octopus.wr.usgs.gov
Process_Step:
Process_Description:
Magnetics Data >06/21/2012 carolyn l-7-77-wg.260_010 > >Reprocessed using subroutines from Susan Macmillan's >IGRF SYNTHESIS PROGRAM http://www.ngdc.noaa.gov/IAGA/vmod/igrf11.f >with IGRF-11 coeffiecients integrated into the source code. >/infobank/programs/mag/magred11/magred11.for >Using geodetic coordinate system (Earth shape approximated by spheriod) >with altitude 0.0 km (for sea level). > >Input was... >10/31/1998 /tiger/l/l777wg/mag/l-7-77-wg.240_010 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >01/24/86 CAROLYN DRS$DATA:[L777WG.M]L777WG.240; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 >187/1130-189/1905 was F.1 from Clint >189/1905-203/1036 was L777WG.DRCPF1.MAGSC1 on TAM211 > was L777WG240.DAT on VAM211 >the slave values look more like regional > >Converted to time format with year at start. > >01/24/86 KAYE DUA0:[DATA.L777WG.N]L777WG.010; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >time, lat, long, time(sec) to nearest nav fix, data values
Process_Date: 20120621
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
Contact_Person: Carolyn H. Degnan
Contact_Position: Geophysicist
Contact_Address:
Address_Type: mailing and physical address
Address:
USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060-5792
Country: USA
Contact_Voice_Telephone: (831) 460-7452
Contact_Facsimile_Telephone: (831) 427-4748
Contact_Electronic_Mail_Address: infobank@octopus.wr.usgs.gov
Process_Step:
Process_Description:
Bathymetry Data >10/31/1998 /tiger/l/l777wg/bath/l-7-77-wg.335_010 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >02/06/86 BECKIE DISK$USERDISK:[BECKIE.TEMP]L777WG.335; >DRB0:[DRS.BAT]BATRED.EXE;1 >This file was hand-digetized in 2-way traveltime(secs). >It was reduced using no Matthews correction and velocity >of sound assumed was 1500m/sec. > >Input was... >Converted to time format with year at start. > >01/24/86 KAYE DUA0:[DATA.L777WG.N]L777WG.010; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >time, lat, long, time(sec) to nearest nav fix, data values
Process_Date: 19981031
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
Contact_Person: Carolyn H. Degnan
Contact_Position: Geophysicist
Contact_Address:
Address_Type: mailing and physical address
Address:
USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060-5792
Country: USA
Contact_Voice_Telephone: (831) 460-7452
Contact_Facsimile_Telephone: (831) 427-4748
Contact_Electronic_Mail_Address: infobank@octopus.wr.usgs.gov
Process_Step:
Process_Description:
MGD77 file creation - The available data for each cruise leg are re-formatted and combined into the Marine Geophysical Data Exchange Format (MGD77) and into the internal NGDC SEIS-NAV format by USGS using several USGS developed FORTRAN programs.The FORTRAN programs sample the navigation to every integer minute of the cruise. When necessary, the latitudes and longitudes are linearly interpolated. If the time between the actual navigation fixes exceeds five minutes, no data are included in the MGD77 file.To build the MGD77 file, gravity, magnetics, and bathymetry are added to this sampled navigation. When necessary, gravity, magnetics, and bathymetry data are linearly interpolated if the time between the actual data samples does not exceed five minutes. If a time gap exceeds this, the data are not reported.The navigation data are merged with the seismic shot point data in a SEIS- NAV format file. For this file, navigation data are interpolated for each shot point. Both types of files are written to magnetic tape and sent to NGDC.
Process_Date: 20120620
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG)
Contact_Person: Carolyn H. Degnan
Contact_Position: Geophysicist
Contact_Address:
Address_Type: mailing and physical address
Address:
USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060-5792
Country: USA
Contact_Voice_Telephone: (831) 460-7452
Contact_Facsimile_Telephone: (831) 427-4748
Contact_Electronic_Mail_Address: infobank@octopus.wr.usgs.gov
Process_Step:
Process_Description:
Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog.
Process_Date: 20170201
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Alan O. Allwardt
Contact_Position: Contractor -- Information Specialist
Contact_Address:
Address_Type: mailing and physical address
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Contact_Voice_Telephone: 831-460-7551
Contact_Facsimile_Telephone: 831-427-4748
Contact_Electronic_Mail_Address: aallwardt@usgs.gov
Process_Step:
Process_Description:
Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed.
Process_Date: 20201019
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Spatial_Data_Organization_Information:
Indirect_Spatial_Reference: Western Gulf of 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: l777wg.m77t
Entity_Type_Definition:
MGD77T single-beam bathymetry, gravity, and magnetics data file for L777WG
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: 19770703
Range_Domain_Maximum: 19770722
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: 2359.55
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: 54.97199
Range_Domain_Maximum: 58.14342
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: -156.74421
Range_Domain_Maximum: -147.44074
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: 0.029
Range_Domain_Maximum: 7.348
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: 21.7
Range_Domain_Maximum: 5525
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: 52343
Range_Domain_Maximum: 54453
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: 54423
Range_Domain_Maximum: 52167
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: -522.3
Range_Domain_Maximum: 522
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: 981176.6
Range_Domain_Maximum: 981884.8
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: -44
Range_Domain_Maximum: 56.2
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: -40.2
Range_Domain_Maximum: 16.3
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: 0
Range_Domain_Maximum: 799
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: 4195
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 L777WG in MGD77T format.
Entity_and_Attribute_Detail_Citation:
Attributes are obtained from MGD77T data files created from the navigation gravity, magnetic, and bathymetry best files. MGD77T is the standard, defined data format used for geophysical data in the National Geophysical Data Center. See Cross_Reference section above for citation details.
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing and physical address
Address: 345 Middlefield Road MS 999
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025
Country: USA
Contact_Voice_Telephone: (650) 329-5078
Contact_Facsimile_Telephone: (650) 329-5190
Resource_Description: Downloadable Data
Distribution_Liability:
Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: MGD77t
Format_Version_Number: 10
Format_Specification: MGD77
Format_Information_Content: tab-delimited ASCII text files.
Transfer_Size: 2.5
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://www.ngdc.noaa.gov/mgg/trk/trackline/samuel_p._lee/l777wg/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_89-167/873.html>
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