g177eg.m77t and g177eg.h77t: MGD77T data and header files for single-beam bathymetry data for field activity G-1-77-EG in Yakutat Bay, Eastern Gulf of Alaska from 04/27/1977 to 05/22/1977

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
Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

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

g177eg.m77t and g177eg.h77t: MGD77T data and header files for single-beam bathymetry data for field activity G-1-77-EG in Yakutat Bay, Eastern Gulf of Alaska from 04/27/1977 to 05/22/1977

Geospatial_Data_Presentation_Form: tab-delimited ASCII text files
Publication_Information:

Publication_Place: St. Petersburg, FL
Publisher: U.S. Geological Survey

Online_Linkage: http://pubs.usgs.gov/ds/757/data/m77t/g177eg.m77t
Larger_Work_Citation:

Citation_Information:

Originator: Heather A. Schreppel
Originator: Carolyn H. Degnan
Originator: Dan R. Metzger
Originator: Shawn V. Dadisman
Publication_Date: 2013
Title:

Archive of U.S. Geological Survey selected single-beam bathymetry datasets, 1969-2000

Edition: 1.0
Geospatial_Data_Presentation_Form: Digital Document
Series_Information:

Series_Name: U.S. Geological Survey Data Series
Issue_Identification: 757

Publication_Information:

Publication_Place: St. Petersburg, FL
Publisher: U.S. Geological Survey

Online_Linkage: http://pubs.usgs.gov/ds/757

Description:

Abstract:

Single-beam bathymetry data along with dead reckoning navigation data was collected as part of the U.S. Geological Survey cruise G-1-77-EG. The cruise was conducted in Yakutat Bay, Eastern Gulf of Alaska from April 27 to May 22, 1977. The chief scientist was Paul Carlson from the USGS Coastal and Marine Geology office in Menlo Park, CA. The geophysical source was a 3.5 kilohertz (kHz) system. 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/g/g177eg/html/g-1-77-eg.meta.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 was collected as dead reckoning analog records. The Data Acquisition, 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 (.0xx, .6xx) space-delimited ASCII data file. The header information rows are indicated by lines beginning with the character "!". The single-beam bathymetry data are collected with a 3.5 kHz system as analog records and later hand-digitized. The bathymetry datasets were commonly processed using three programs: (A) Batred, which calculates depth from travel times; (B) nosamebathy, which eliminates identical adjacent bathymetry values; and (C) nozerobathy, which removes records with a depth value of "0.0". However, not all of the datasets included in this report were processed with one or more of these programs. If the data was not run through these programs it was reformatted using the most recent "best file" on InfoBank, often these were categorized by InfoBank as raw bathymetry files. Details about which processing steps were taken by the DAPS group can be found in the header information of the bathymetry and navigation ASCII files downloaded from InfoBank. Prior to reformatting the data into MGD77T format the "best" bathymetry and navigation files from InfoBank were edited to remove the header information and reformatted using Excel 2010 to separate the data into columns based on tabs. Next the bathymetry and navigation files were merged based on time and latitude and longitude. The combined navigation and bathymetry was saved as a .txt file. This combined bathymetry and navigation file was used as an input file into the GEODAS ReFormat to MDG77T program developed by NOAA's NGDC. The program outputs the reformatted data as a tab-delimited .m77t file. The program is available for use at: http://www.ngdc.noaa.gov/mgg/gdas/gx_announce.Html. For information regarding fields found within the MGD77T files, please refer to the publication, Hittelman and others (2010), found within the Cross-reference section of this metadata file. Each MGD77T data file also has an accompanying header file (.h77t). The fields within these header files are also defined in the aforementioned publication. Fields are populated based on InfoBank metadata records, digital data file headers, and accompanying publications (often cruise reports) for the survey. If a field is unknown or did not apply to the dataset it is intentionally left blank.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 19770427
Ending_Date: 19770522

Currentness_Reference: ground condition

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -143.84149
East_Bounding_Coordinate: -139.49023
North_Bounding_Coordinate: 60.08285
South_Bounding_Coordinate: 59.36168

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:3cda3c32-5c5b-4044-b1c0-919f15ad4c08

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:

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: Geographic Names Information System (GNIS)
Place_Keyword: State of Alaska
Place_Keyword: Gulf of Alaska
Place_Keyword: Yakutat Bay

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.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Heather A. Schreppel
Contact_Organization:

Cherokee Nation Technology Solutions, contracted to U.S. Geological Survey

Contact_Position: IT Management Specialist/Database Support Assistant
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. 3013
Contact_Electronic_Mail_Address: hschreppel@usgs.gov

Data_Set_Credit: Jim Gardner (Chief Scientist, USGS Western Region);
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 according to DAPS group. Reasons for gaps in data varies by cruise, see InfoBank for more details.

Navigation Data (g-1-77-eg.010 [DRS])
YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
197704271839010    197705051759070
197705081425070    197705082305070
197705091320070    197705092115070
197705101110070    197705101900070
197705110800070    197705110920070
197705111135140    197705111547140
197705131324070    197705131750070
197705131814000    197705131850000
197705131955070    197705132125070
197705141758070    197705141930070
197705151554070    197705152108070
197705161959070    197705162310070
197705170100070    197705170545070
197705181237010    197705181315010
197705181541070    197705181618070
197705182128070    197705182240070
197705191325070    197705191450070
197705191639070    197705191810070
197705191915070    197705192035070
197705201415070    197705201740070
197705220825080    197705220918080
197705221012080    197705221345080
197705221407080    197705221945080
197705222007080    197705222200080
YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
Bathymetry Data (g-1-77-eg.335_010)
YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
197704291130300    197704291137000
197704291143000    197704291150000
197704291157000    197704291202000
197704291225000    197704291237000
197704291245000    197704291342000
197704291348000    197704291350000
197704291356000    197704291356000
197704291402000    197704291410300
197704291418000    197704291432180
197704291438000    197704291438000
197704291445000    197704291445000
197704291453000    197704291527000
197704291533000    197704291533000
197704291543000    197704291543000
197704291558000    197704291600000
197704291614000    197704291614000
197704291633000    197704291633000
197704291640000    197704291640000
197704291652000    197704291711060
197704291717120    197704291717120
197704291724180    197704291731540
197704291738000    197704291738000
197704291745000    197704291803000
197704291816000    197704291840000
197704291845360    197704291850300
197704291901000    197704291901000
197704291909000    197704291909000
197704291919000    197704291931000
197704291937300    197704291937300
197704291945000    197704291947120
197704291955000    197704292011000
197704292021000    197704292022000
197704292028180    197704292054000
197705011034000    197705011038300
197705011045000    197705011107300
197705011114000    197705011114000
197705011120000    197705011217000
197705011226000    197705011250000
197705011256300    197705011312000
197705020952000    197705020952000
197705021000000    197705021026000
197705021037000    197705021043000
197705021054000    197705021110000
197705021116000    197705021129000
197705021137000    197705021144000
197705021150000    197705021156000
197705021203000    197705021216000
197705021222000    197705021227300
197705021236000    197705021300000
197705021305120    197705021313300
197705021319300    197705021324000
197705021331000    197705021331000
197705021337000    197705021344000
197705021431000    197705021439000
197705021445000    197705021452000
197705021512000    197705021604000
197705021612000    197705021638300
197705021646000    197705021652000
197705021657420    197705021657420
197705021704000    197705021704000
197705021709300    197705021721000
197705021727000    197705021755300
197705021804000    197705021816000
197705021821300    197705021821300
197705021827000    197705021827000
197705021833120    197705021843300
197705040933000    197705040935000
197705040945000    197705040950000
197705040956000    197705041010000
197705041020000    197705041736000
197705041741300    197705042000000
197705042012000    197705042125000
197705042132000    197705042310000
197705051126000    197705051216300
197705051225000    197705051245000
197705051346000    197705051630000
197705081434240    197705081437480
197705081443300    197705081519000
197705081525000    197705081531000
197705081537000    197705081544300
197705081550300    197705081600000
197705081608000    197705081613000
197705081619000    197705081632000
197705081640000    197705081850000
197705081900000    197705081950000
197705082000000    197705082241000
197705082248360    197705082304000
197705091320000    197705092115000
197705101110000    197705101117000
197705101122300    197705101140000
197705101146000    197705101230000
197705101236000    197705101236000
197705101241300    197705101253300
197705101300000    197705101305000
197705101312120    197705101327180
197705101335000    197705101500000
197705101510000    197705101644180
197705101650000    197705101900000
197705110801000    197705110834000
197705110839180    197705110839180
197705110850000    197705110857000
197705110909300    197705110920000
197705111146300    197705111229300
197705111235180    197705111437000
197705111443000    197705111450000
197705111458300    197705111524180
197705111530000    197705111546000
197705131330000    197705131357000
197705131405000    197705131443000
197705131450000    197705131512000
197705131520000    197705131545000
197705131551000    197705131628000
197705131633300    197705131651000
197705131700000    197705131712000
197705131719000    197705131719000
197705131725000    197705131750000
197705131953000    197705131953000
197705132000000    197705132045000
197705132055000    197705132125000
197705141758000    197705141909000
197705141915000    197705141930000
197705151555000    197705151610300
197705151620000    197705151729000
197705151735000    197705151804000
197705151809120    197705151843000
197705151850000    197705151939000
197705151945000    197705152022300
197705152028000    197705152108000
197705170100000    197705170500360
197705170510000    197705170543000
197705181558000    197705181558000
197705181604000    197705181618000
197705182129000    197705182203120
197705182210000    197705182212000
197705182220000    197705182231000
197705182237300    197705182238000
197705191325000    197705191445000
197705191639000    197705191658120
197705191707000    197705191730000
197705191735120    197705191811000
197705191914000    197705191914000
197705191920000    197705191944000
197705191950000    197705192015000
197705192023000    197705192035000
197705201415000    197705201500000
197705201506000    197705201511120
197705201520000    197705201520000
197705201526000    197705201619000
197705201630000    197705201646300
197705201652000    197705201740000
197705220826000    197705220918000
197705221012000    197705221315000
197705221328000    197705221328000
197705221345000    197705221410000
197705221420000    197705222005000
197705222015000    197705222150000
197705222200000    197705222200000
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:

Below are the details about which processing steps were taken by the DAPS group that can be found in the header information of the ASCII files downloaded from InfoBank. Navigation Data

Converted to time format with year at start.

01/23/86 KAYE DUA0:[DATA.G177EG.N]G177EG.010;
DRB0:[DRS.REFMT]REFORMAT.EXE;5

Process_Date: 19951206
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:

Below are the details about which processing steps were taken by the DAPS group that can be found in the header information of the ASCII files downloaded from InfoBank. Bathymetry Data

10/31/1998  /tiger/g/g177eg/bath/g-1-77-eg.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]G177EG.335;
DRB0:[DRS.BAT]BATRED.EXE;1
This file was hand-digetized in 2-way traveltime(secs).
It was reduced with no Matthews correction and velocity
of sound assumed was 1500m/sec.

Input was...
Converted to time format with year at start.

01/23/86 KAYE DUA0:[DATA.G177EG.N]G177EG.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:

A navigation file identified as the best available version in InfoBank for this cruise was copied and saved as an ASCII text file to be combined with the best available bathymetry file for processing to MGD77T format. For details regarding processing steps performed on these best available files from InfoBank, please see the header information within the original files at http://walrus.wr.usgs.gov/infobank/ and previous processing steps.

Source_Used_Citation_Abbreviation: g-1-77-eg.010.txt
Process_Date: 2012
Source_Produced_Citation_Abbreviation: g177egnav.txt
Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey

Contact_Person: Heather A. Schreppel

Contact_Position: IT Management Specialist/Database Support Assistant
Contact_Address:

Address_Type: mailing and physical address
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA

Contact_Voice_Telephone: 727-803-8747 ext. 3013
Contact_Electronic_Mail_Address: hschreppel@usgs.gov

Process_Step:

Process_Description:

A bathymetry file identified as the best available version in InfoBank for this cruise was copied and saved as an ASCII text file to be combined with the best available navigation file for processing to MGD77T format. For details regarding processing steps performed on these best available files from InfoBank, please see the header information within the original files at http://walrus.wr.usgs.gov/infobank/.

Source_Used_Citation_Abbreviation: g-1-77-eg.335_010.txt
Process_Date: 2012
Source_Produced_Citation_Abbreviation: g177egbathy.txt
Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey

Contact_Person: Heather A. Schreppel

Contact_Position: IT Management Specialist/Database Support Assistant
Contact_Address:

Address_Type: mailing and physical address
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA

Contact_Voice_Telephone: 727-803-8747 ext. 3013
Contact_Electronic_Mail_Address: hschreppel@usgs.gov

Process_Step:

Process_Description:

The best available bathymetry and navigation text files were concatenated into one tab-delimited file using Excel 2010 and several Visual Basic Applications (VBA) macros. InfoBank header information is removed and text is broken into columns and the rows are combined based on the presence of the same values in the time and latitude and longitude columns.

Source_Used_Citation_Abbreviation: g177egbathy.txt, g177egnav.txt
Process_Date: 2012
Source_Produced_Citation_Abbreviation: g177egall.txt
Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey

Contact_Person: Heather A. Schreppel

Contact_Position: IT Management Specialist/Database Support Assistant
Contact_Address:

Address_Type: mailing and physical address
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA

Contact_Voice_Telephone: 727-803-8747 ext. 3013
Contact_Electronic_Mail_Address: hschreppel@usgs.gov

Process_Step:

Process_Description:

The combined bathymetry and navigation file was used as an input file into the GEODAS ReFormat to MDG77T program developed by NOAA's NGDC. The program outputs the reformatted data as a tab-delimited .m77t file. The program is available for use at: http://www.ngdc.noaa.gov/mgg/gdas/gx_announce.Html

Source_Used_Citation_Abbreviation: g177egall.txt
Process_Date: 2012
Source_Produced_Citation_Abbreviation: g177eg.m77t
Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey

Contact_Person: Heather A. Schreppel

Contact_Position: IT Management Specialist/Database Support Assistant
Contact_Address:

Address_Type: mailing and physical address
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA

Contact_Voice_Telephone: 727-803-8747 ext. 3013
Contact_Electronic_Mail_Address: hschreppel@usgs.gov

Process_Step:

Process_Description:

To create the accompanying header files (.h77t), an excel spreadsheet was supplied from NGDC with already populated required field names. For information for header field requirements and definitions see: http://www.ngdc.noaa.gov/mgg/dat/geodas/docs/mgd77.pdf. When creating a header file for each cruise, fields were populated in the header spreadsheet based on InfoBank metadata records, digital data file headers, and accompanying publications (often cruise reports) for the survey. If a field was unknown or did not apply to the dataset it was intentionally left blank.

Source_Used_Citation_Abbreviation:

http://walrus.wr.usgs.gov/infobank/g/g177eg/html/g-1-77-eg.meta.html.

Process_Date: 2012
Source_Produced_Citation_Abbreviation: g177eg.h77t
Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey

Contact_Person: Heather A. Schreppel

Contact_Position: IT Management Specialist/Database Support Assistant
Contact_Address:

Address_Type: mailing and physical address
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA

Contact_Voice_Telephone: 727-803-8747 ext. 3013
Contact_Electronic_Mail_Address: hschreppel@usgs.gov

Process_Step:

Process_Description:

Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog.

Process_Date: 20161229
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:

Added keywords section with USGS persistent identifier as theme keyword.

Process_Date: 20201013
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:

Yakutat Bay, Eastern Gulf of Alaska from 04/27/1977 to 05/22/1977

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: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.98

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: g177eg.m77t
Entity_Type_Definition: MGD77T single-beam bathymetry data file for G177EG
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: Survey Date
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 19770427
Range_Domain_Maximum: 19770522
Attribute_Units_of_Measure: YYYYMMDD, (four digit year, two digit month, two digit day)

Attribute:

Attribute_Label: TIME
Attribute_Definition: Time
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 100
Range_Domain_Maximum: 2310.1167
Attribute_Units_of_Measure: hours and decimal minutes

Attribute:

Attribute_Label: LAT
Attribute_Definition: Latitude
Attribute_Definition_Source:

North American Datum of 1927 (Clarke 1866) Geographic Coordinate System

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 59.36168
Range_Domain_Maximum: 60.08285
Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: LON
Attribute_Definition: Longitude
Attribute_Definition_Source:

North American Datum of 1927 (Clarke 1866) Geographic Coordinate System

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -143.84149
Range_Domain_Maximum: -139.49023
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:

Enumerated_Domain:

Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Observed fix
Enumerated_Domain_Value_Definition_Source: NGDC

Enumerated_Domain:

Enumerated_Domain_Value: 3
Enumerated_Domain_Value_Definition: Interpolated fix
Enumerated_Domain_Value_Definition_Source: NGDC

Enumerated_Domain:

Enumerated_Domain_Value: nil
Enumerated_Domain_Value_Definition: unspecified
Enumerated_Domain_Value_Definition_Source: NGDC

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: 0.01
Range_Domain_Maximum: 0.6
Attribute_Units_of_Measure: seconds

Detailed_Description:

Entity_Type:

Entity_Type_Label: g177eg.h77t
Entity_Type_Definition: MGD77T single-beam bathymetry header file for G-1-77-EG
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: FORMAT_77
Attribute_Definition: Format Acronym
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:

Unrepresentable_Domain: Text string description

Attribute:

Attribute_Label: PARAMS_CO
Attribute_Definition: Parameters surveyed codes.
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:

Unrepresentable_Domain:

Status of geophysical parameters for this survey. See Hittelman and others (2010) from the Cross_Reference section above for details.

Attribute:

Attribute_Label: INST_SRC
Attribute_Definition: Source Institution
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:

Unrepresentable_Domain: Text string description

Attribute:

Attribute_Label: COUNTRY
Attribute_Definition: Country
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:

Unrepresentable_Domain: Text string description

Attribute:

Attribute_Label: PLATFORM
Attribute_Definition: Platform name
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:

Unrepresentable_Domain: Text string description

Attribute:

Attribute_Label: PLAT_TYPCO
Attribute_Definition: Platform type code
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: nil
Enumerated_Domain_Value_Definition: Unspecified
Enumerated_Domain_Value_Definition_Source: NGDC

Enumerated_Domain:

Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Surface Ship
Enumerated_Domain_Value_Definition_Source: NGDC

Enumerated_Domain:

Enumerated_Domain_Value: 2
Enumerated_Domain_Value_Definition: Submersible Ship
Enumerated_Domain_Value_Definition_Source: NGDC

Enumerated_Domain:

Enumerated_Domain_Value: 3
Enumerated_Domain_Value_Definition: Aircraft
Enumerated_Domain_Value_Definition_Source: NGDC

Enumerated_Domain:

Enumerated_Domain_Value: 4
Enumerated_Domain_Value_Definition: Buoy
Enumerated_Domain_Value_Definition_Source: NGDC

Enumerated_Domain:

Enumerated_Domain_Value: 5
Enumerated_Domain_Value_Definition: Mobile land
Enumerated_Domain_Value_Definition_Source: NGDC

Enumerated_Domain:

Enumerated_Domain_Value: 6
Enumerated_Domain_Value_Definition: Fixed land
Enumerated_Domain_Value_Definition_Source: NGDC

Enumerated_Domain:

Enumerated_Domain_Value: 7
Enumerated_Domain_Value_Definition: Deep tow
Enumerated_Domain_Value_Definition_Source: NGDC

Attribute:

Attribute_Label: PLAT_TYP
Attribute_Definition: Platform type
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:

Unrepresentable_Domain: Text string description

Attribute:

Attribute_Label: CHIEF
Attribute_Definition: Chief Scientist(s)
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:

Unrepresentable_Domain: Text string description

Attribute:

Attribute_Label: PROJECT
Attribute_Definition: Project, cruise, leg
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:

Unrepresentable_Domain: Text string description

Attribute:

Attribute_Label: FUNDING
Attribute_Definition: funding
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:

Unrepresentable_Domain: Text string description

Attribute:

Attribute_Label: DATE_DEP
Attribute_Definition: survey departure date
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 19770427
Range_Domain_Maximum: 20000629
Attribute_Units_of_Measure: YYYYMMDD (four digit year, two digit month, two digit day)

Attribute:

Attribute_Label: PORT_DEP
Attribute_Definition: port of departure
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:

Unrepresentable_Domain: Text string description

Attribute:

Attribute_Label: DATE_ARR
Attribute_Definition: survey arrival date
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 19770427
Range_Domain_Maximum: 20000629
Attribute_Units_of_Measure: YYYYMMDD (four digit year, two digit month, two digit day)

Attribute:

Attribute_Label: PORT_ARR
Attribute_Definition: port of arrival
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:

Unrepresentable_Domain: Text string description

Attribute:

Attribute_Label: NAV_INSTR
Attribute_Definition: navigation instrumentation
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:

Unrepresentable_Domain: Text string description

Attribute:

Attribute_Label: POS_INFO
Attribute_Definition: position determination method/ geodetic datum
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:

Unrepresentable_Domain: Text string description

Attribute:

Attribute_Label: BATH_INSTR
Attribute_Definition: bathymetry instrumentation
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:

Unrepresentable_Domain: Text string description

Attribute:

Attribute_Label: BATH_ADD
Attribute_Definition: additional forms of bathymetry
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:

Unrepresentable_Domain: Text string description

Attribute:

Attribute_Label: LAT_TOP
Attribute_Definition: Latitude
Attribute_Definition_Source: World Geodetic System 1984 Geographic Coordinate System
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 16.38240
Range_Domain_Maximum: 89.98766
Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: LAT_BOTTOM
Attribute_Definition: Latitude
Attribute_Definition_Source: World Geodetic System 1984 Geographic Coordinate System
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 16.38240
Range_Domain_Maximum: 89.98766
Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: LON_LEFT
Attribute_Definition: Longitude
Attribute_Definition_Source: World Geodetic System 1984 Geographic Coordinate System
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 10.30551
Range_Domain_Maximum: -117.13802
Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: LON_RIGHT
Attribute_Definition: Longitude
Attribute_Definition_Source: World Geodetic System 1984 Geographic Coordinate System
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 10.30551
Range_Domain_Maximum: -117.13802
Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: BATH_DRATE
Attribute_Definition: general digitizing rate of bathymetry
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:

Unrepresentable_Domain: Text string description

Attribute:

Attribute_Label: SOUND_VEL
Attribute_Definition: assumed sound velocity
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:

Unrepresentable_Domain: Text string description

Attribute:

Attribute_Label: VDATUM_CO
Attribute_Definition: bathymetric vertical datum
Attribute_Definition_Source: NGDC
Attribute_Domain_Values:

Unrepresentable_Domain: In our datasets, no correction was applied. All values equal 0.

Overview_Description:

Entity_and_Attribute_Overview:

Bathymetry and navigation data for U.S. Geological Survey bathymetry survey G-1-77-EG 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. The MGD77T format contains more attributes than defined here. Attributes that were null for this data were not included. Details about other attributes can be found in Hittelman and others (2010), see Cross_Reference section above for citation details.

Metadata_Reference_Information:

Metadata_Date: 20201013
Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Heather A. Schreppel
Contact_Organization:

Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey

Contact_Position: IT Management Specialist/Database Support Assistant
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. 3013
Contact_Electronic_Mail_Address: hschreppel@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/spcmsc/DS757_g177eg.html>