l785nc.m77t - MGD77 data file for Geophysical data from field activity l-7-85-nc in Southern Pacific from 12/28/1983 to 01/03/1984

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:

l785nc.m77t - MGD77 data file for Geophysical data from field activity l-7-85-nc in Southern Pacific from 12/28/1983 to 01/03/1984

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/l785nc/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 data along with transit satellite navigation data was collected as part of field activity L-7-85-NC in Northern California from 09/23/1985 to 10/04/1985, http://walrus.wr.usgs.gov/infobank/l/l785nc/html/l-7-85-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/l785nc/html/l-7-85-nc.bath.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: 19850923
Ending_Date: 19851004

Currentness_Reference: ground condition

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -124.81406
East_Bounding_Coordinate: -122.73741
North_Bounding_Coordinate: 44.65134
South_Bounding_Coordinate: 37.86443

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:51c3d4a1-8cb5-4cd2-ac76-95b14061bcbd

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: marine geophysics

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: single-beam echo sounder
Theme_Keyword: bathymetry measurement
Theme_Keyword: bathymetry
Theme_Keyword: marine geophysics

Place:

Place_Keyword_Thesaurus: none
Place_Keyword: CA
Place_Keyword: North Pacific Ocean
Place_Keyword: Northern California
Place_Keyword: Northern Pacific Ocean
Place_Keyword: Pacific Coast, US
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 Cacchione, Mike Field(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-7-85-nc.071) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198509232115000 198509232115000 >198509232130000 198509232130000 >198509232138000 198509232138000 >198509232145000 198509232205000 >198509232227000 198510030833000 >198510030952000 198510040750000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-7-85-nc.330_071) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198509232252190 198510030833000 >198510030952000 198510040750000 >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. > >11/26/85 KAYE DUA0:[DATA.L785NC.N]L785NC.071; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >Input was... >10/22/85 KAYE DUA0:[DATA.L785NC.N]L785NC.052; >DRB0:[DRS.NAV]SINSADJ.EXE; > >10/22/85 KAYE DUA0:[DATA.L785NC.N]L785NC.021; >DRB0:[DRS.NAV]FIXERUPDT.EXE;2 >

Process_Date: 19960119
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/l785nc/bath/l-7-85-nc.330_071 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >08/18/88 JEAN DUA0:[DRS.CDI.FIELD]L785NC.330; >DUA0:[DRS.BAT]BATRED.EXE;2 >Edited bathymetry data >the travel time was computed using 1500 m/sec > >10/24/85 EDM DRS$DATA:[L785NC.B]L785NC.301; >DRB0:[DRS.DSMPL]DESAMTIME.EXE;1 > >Input was... >Converted to time format with year at start. > >11/26/85 KAYE DUA0:[DATA.L785NC.N]L785NC.071; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >10/22/85 KAYE DUA0:[DATA.L785NC.N]L785NC.052; >DRB0:[DRS.NAV]SINSADJ.EXE; > >10/22/85 KAYE DUA0:[DATA.L785NC.N]L785NC.021; >DRB0:[DRS.NAV]FIXERUPDT.EXE;2 > >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: 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: l785nc.m77t
Entity_Type_Definition: MGD77T single-beam bathymetry data file for l785nc
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: 19850923
Range_Domain_Maximum: 19851004
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: 37.86443
Range_Domain_Maximum: 44.65134
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: -124.81406
Range_Domain_Maximum: -122.73741
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: 0.002
Range_Domain_Maximum: 2.4299
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: 0.1
Range_Domain_Maximum: 1802.3
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 and navigation data for U.S. Geological Survey survey l785nc in MGD77T format.

Entity_and_Attribute_Detail_Citation:

Attributes are obtained from MGD77T data files created from the navigation 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: .921

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

http://www.ngdc.noaa.gov/mgg/trk/trackline/samuel_p._lee/l785nc/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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