l685nc.m77t - MGD77 data file for Geophysical data from field activity L-6-85-NC in Northern California from 09/03/1985 to 09/20/1985

Metadata also available as - [Questions & Answers] - [Parseable text] - [XML]

Metadata:

Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Spatial_Reference_Information
Entity_and_Attribute_Information
Distribution_Information
Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: U.S. Geological Survey
Originator: Coastal and Marine Geology Program
Publication_Date: 2013
Title:

l685nc.m77t - MGD77 data file for Geophysical data from field activity L-6-85-NC in Northern California from 09/03/1985 to 09/20/1985

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/l685nc/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 and magnetics data along with DGPS navigation data was collected as part of field activity L-6-85-NC in Northern California from 09/03/1985 to 09/20/1985, http://walrus.wr.usgs.gov/infobank/l/l685nc/html/l-6-85-nc.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/l685nc/html/l-6-85-nc.bath.html and http://walrus.wr.usgs.gov/infobank/l/l685nc/html/l-6-85-nc.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: 19850903
Ending_Date: 19850920

Currentness_Reference: ground condition

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -128.13434
East_Bounding_Coordinate: -124.04391
North_Bounding_Coordinate: 44.62615
South_Bounding_Coordinate: 40.52400

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:8f6e45c3-e285-4986-8d67-bce0a659f04e

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 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: 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: magnetometer measurement
Theme_Keyword: marine geophysics

Place:

Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: CA
Place_Keyword: North Pacific Ocean
Place_Keyword: Northern California
Place_Keyword: Northern Pacific Ocean
Place_Keyword: Pacific Northwest EEZ
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: Jan Morton (Chief Scientist); Mark Holmes (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-6-85-nc.059 [SINS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198509031940000 198509060120000 >198509060129008 198509060129008 >198509060242000 198509061834000 >198509061842000 198509061900000 >198509061924000 198509062108000 >198509062116000 198509062148000 >198509062200000 198509062310000 >198509062332000 198509081358000 >198509081408000 198509090212000 >198509090228000 198509090250000 >198509090334000 198509090724000 >198509090730000 198509090730000 >198509090738000 198509100736000 >198509100744000 198509111704000 >198509111710000 198509111712000 >198509111730000 198509111830000 >198509111838000 198509130334000 >198509130346000 198509131000000 >198509131005008 198509131005008 >198509131014000 198509131910000 >198509131930000 198509131930000 >198509132000000 198509132000000 >198509132030000 198509132030000 >198509132100000 198509140746000 >198509140800000 198509140800000 >198509140830000 198509140830000 >198509140900000 198509140900000 >198509140930000 198509140930000 >198509141000000 198509141000000 >198509141028000 198509141030000 >198509141038000 198509142008000 >198509142020000 198509170106000 >198509170116000 198509170211008 >198509170230000 198509200230000 >198509200246000 198509202328000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (l-6-85-nc.220_059) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198509032203560 198509050020040 >198509060241040 198509062203000 >198509062238360 198509070216280 >198509071245040 198509072200000 >198509072205040 198509080801320 >198509080808000 198509092131480 >198509092137120 198509100400240 >198509131902240 198509140130040 >198509140228240 198509141221560 >198509152104320 198509152316000 >198509160639120 198509161617000 >198509191123320 198509192102040 >198509192140560 198509201644280 >198509201705480 198509202138240 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-6-85-nc.330_059) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198509032128000 198509032156000 >198509032206000 198509040006000 >198509040012000 198509040024000 >198509040030000 198509040200000 >198509040206000 198509040216000 >198509040222000 198509040250000 >198509040258000 198509040258000 >198509040312000 198509040316000 >198509040324000 198509040324000 >198509040330000 198509040344000 >198509040350000 198509040426000 >198509040436000 198509040436000 >198509040446000 198509040446000 >198509040500000 198509040500000 >198509040506000 198509040508000 >198509040540000 198509040540000 >198509040556000 198509040604000 >198509040616000 198509040616000 >198509040624000 198509040630000 >198509040642000 198509040648000 >198509040654000 198509040702000 >198509040708000 198509040817000 >198509040823000 198509041112000 >198509041118000 198509041623000 >198509041642000 198509041806000 >198509041814000 198509041817000 >198509041825000 198509041838000 >198509041848000 198509041932000 >198509041938000 198509042113000 >198509042120000 198509042252000 >198509042258000 198509042320000 >198509042335000 198509050014000 >198509050021000 198509050025000 >198509050035000 198509050052000 >198509050059000 198509050227000 >198509050459000 198509050533000 >198509050539000 198509050539000 >198509050555000 198509050555000 >198509050603000 198509050603000 >198509050619000 198509050647000 >198509050657000 198509050729000 >198509050735000 198509051031000 >198509051057000 198509051721000 >198509051743000 198509051831000 >198509051901000 198509060009000 >198509060021000 198509060025000 >198509060037000 198509060039000 >198509060101000 198509060121000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Seismic Shots Data (l-6-85-nc.400_059) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198509071240000 198509071849150 >198509071855000 198509080340300 >198509080432520 198509081215370 >198509091820000 198509100329225 >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. > >06/10/86 CLINT DRS$DATA:[L685NC]L685NC.059; >DRB0:[DRS.RANGE]MINRMERGE.EXE; >

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:

Magnetics Data >07/18/2012 carolyn l-6-85-nc.220_059 > >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/l685nc/mag/l-6-85-nc.200_059 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >12/17/85 CAROLYN DRS$DATA:[L685NC.M]L685NC.200; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >10/23/85 EDM DRS$DATA:[L685NC.M]L65M01.200; >DRS$DATA:[L685NC.M]TEMP.EXE; >Program TEMP subtracted 40 minutes from erroneous blocks of time > >10/23/85 EDM DRS$DATA:[L685NC.M]L65M01.200; >DRB0:[DRS.MAG]REFMTMAG.EXE; > >Converted to time format with year at start. > >06/10/86 CLINT DRS$DATA:[L685NC]L685NC.059; >DRB0:[DRS.RANGE]MINRMERGE.EXE; > >time, lat, long, time(sec) to nearest nav fix, data values

Process_Date: 20120718
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/l685nc/bath/l-6-85-nc.330_059 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >08/18/88 JEAN DUA0:[DRS.CDI.MORTON]L685NC.330; >DUA0:[DRS.BAT]BATRED.EXE;2 >Edited bathymetry data >The travel time was computed using 1500 m/sec > >05/13/87 BECKIE DUA0:[DATA.L685NC]L685NC.303; >This file is an edited version of L685NC.302. >The time gap between 2480227000 and 2480459000 >is due to totally bad data being deleted. > >Input was... >Converted to time format with year at start. > >06/10/86 CLINT DRS$DATA:[L685NC]L685NC.059; >DRB0:[DRS.RANGE]MINRMERGE.EXE; > >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: Northern California
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: l685nc.m77t
Entity_Type_Definition: MGD77T single-beam bathymetry data file for L685NC
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: 19850903
Range_Domain_Maximum: 19850920
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: 40.52400
Range_Domain_Maximum: 44.62615
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: -128.13434
Range_Domain_Maximum: -124.04391
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: 0.0784
Range_Domain_Maximum: 4.482
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: 58.8
Range_Domain_Maximum: 3341.4
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

Overview_Description:

Entity_and_Attribute_Overview:

Bathymetry, magnetics, and navigation data for U.S. Geological Survey bathymetry survey L685NC in MGD77T format.

Entity_and_Attribute_Detail_Citation:

Attributes are obtained from MGD77T data files created from the navigation, 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: 1.1

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

http://www.ngdc.noaa.gov/mgg/trk/trackline/samuel_p._lee/l685nc/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

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