U.S. Geological Survey
Coastal and Marine Geology Program
2013
d179eg.m77t and d179eg.h77t: MGD77T data and header files for single-beam bathymetry data for field activity D-1-79-EG in the Eastern Gulf of Alaska from 05/24/1979 to 06/01/1979
tab-delimited ASCII text files
St. Petersburg, FL
U.S. Geological Survey
http://pubs.usgs.gov/ds/757/data/m77t/d179eg.m77t
Heather A. Schreppel
Carolyn H. Degnan
Dan R. Metzger
Shawn V. Dadisman
2013
Archive of U.S. Geological Survey selected single-beam bathymetry datasets, 1969-2000
1.0
Digital Document
U.S. Geological Survey Data Series
757
St. Petersburg, FL
U.S. Geological Survey
http://pubs.usgs.gov/ds/757
Single-beam bathymetry data along with SINS navigation data was collected as part of the U.S. Geological Survey cruise D-1-79-EG. The cruise was conducted in the Eastern Gulf of Alaska from May 24 to June 1, 1979. The chief scientists were Bruce Molnia from the USGS Coastal and Marine Geology office in Menlo Park, CA and Mark Wheeler.
The purpose of this cruise was to collect sediment samples and cores for a microfossil study. The geophysical source was a 3.5 kilohertz (kHz) bathymetry 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/d/d179eg/html/d-1-79-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.
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/).
The navigation data are collected using a Shipboard Integrated Navigation System (SINS). used Transit satellite navigation and a number of subsystems that were used in dead reckoning between satellite fixes. These included Doppler sonar, speed-of-sound velocimeter, water temperature sensor, gyrocompass, electromagnetic speed log, radionavigation and other subsystems. SINS was highly variable and at best there was a 50 m accuracy.
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 as analog records with a 3.5 kHz system and 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.
19790524
19790601
ground condition
None planned
-142.00000
-135.00000
60.00000
57.25000
USGS Metadata Identifier
USGS:702aa974-acc0-46be-aefa-fb9ce7135685
ISO 19115 Topic Category
geoscientificinformation
oceans
None
Marine Geology
Marine Geophysics
Single-beam Bathymetry
Water Depth
Seafloor Topography
Data Categories for Marine Planning
distributions
bathymetry and elevation
Marine Realms Information Bank (MRIB) Keywords
single-beam echo sounder
marine geophysics
USGS Thesaurus
single-beam echo sounder
bathymetry measurement
bathymetry
marine geophysics
Geographic Names Information System (GNIS)
State of Alaska
Gulf of Alaska
None. These data are held in the public domain.
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.
Heather A. Schreppel
Cherokee Nation Technology Solutions, contracted to U.S. Geological Survey
IT Management Specialist/Database Support Assistant
mailing and physical
600 4th Street South
St. Petersburg
FL
33701
USA
(727) 803-8747, ext. 3013
hschreppel@usgs.gov
Mark Wheeler (Chief Scientist);
Bruce Molnia (Chief Scientist, USGS Western Region)
Hittelman, Allen M., Groman, Robert C., Haworth, Richard T., Holcombe, Troy L., McHendrie, Graig, Smith, Stuart M., and Metzger, Dan R.
2010
The marine geophysical data exchange format - MGD77 / MGD77T
Boulder, CO
National Geophysical Data Center, National Oceanic and Atmospheric Administration
25 p.
http://www.ngdc.noaa.gov/mgg/dat/geodas/docs/mgd77.pdf
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.
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.
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 (d-1-79-eg.051 [SINS])
>YYYYMMDDHHMMSST YYYYMMDDHHMMSST
>197905251000000 197905301211000
>197905301253000 197905301443000
>197905301532000 197905301701000
>197905301745000 197905301820000
>197905301901000 197905301901000
>197905301945000 197905310931000
>197905311015000 197905311030000
>197905311127000 197905311127000
>197905311323000 197905311323000
>197905311945000 197906011350000
>YYYYMMDDHHMMSST YYYYMMDDHHMMSST
>Bathymetry Data (d-1-79-eg.305_051)
>YYYYMMDDHHMMSST YYYYMMDDHHMMSST
>197905251000000 197905251145000
>197905251230000 197905251305000
>197905251350000 197905251425000
>197905251525000 197905251605000
>197905251645000 197905251725000
>197905251805000 197905251910000
>197905251950000 197905252020000
>197905252100000 197905252115000
>197905252130000 197905252145000
>197905252210000 197905252230000
>197905252300000 197905252310000
>197905252335000 197905252340000
>197905260000000 197905260015000
>197905260040000 197905260135000
>197905260220000 197905260225000
>197905260250000 197905260305000
>197905260335000 197905260350000
>197905260420000 197905260425000
>197905260510000 197905260635000
>197905260745000 197905260750000
>197905260835000 197905260855000
>197905260935000 197905261000000
>197905261035000 197905261125000
>197905261155000 197905261250000
>197905261325000 197905261710000
>197905261830000 197905261850000
>197905261925000 197905261950000
>197905262015000 197905262045000
>197905262120000 197905262145000
>197905262210000 197905262245000
>197905262330000 197905270005000
>197905270100000 197905270115000
>197905270125000 197905270130000
>197905270750000 197905270810000
>197905270945000 197905271015000
>197905271055000 197905271115000
>197905271155000 197905271215000
>197905271255000 197905271330000
>197905271400000 197905271425000
>197905271455000 197905271515000
>197905271540000 197905271605000
>197905271645000 197905271700000
>197905271730000 197905271835000
>197905271930000 197905271945000
>197905272045000 197905272115000
>197905272155000 197905272215000
>197905272245000 197905272305000
>197905272345000 197905280005000
>197905280045000 197905280100000
>197905280140000 197905280215000
>197905280255000 197905280315000
>197905280410000 197905280420000
>197905280505000 197905280540000
>197905280635000 197905280655000
>197905280750000 197905280815000
>197905280900000 197905280930000
>197905281030000 197905281050000
>197905281100000 197905281105000
>197905281235000 197905281305000
>197905281425000 197905281500000
>197905281630000 197905281655000
>197905281840000 197905281900000
>197905281945000 197905282020000
>197905282050000 197905282115000
>197905282150000 197905282220000
>197905282250000 197905282320000
>197905282350000 197905290020000
>197905290050000 197905290130000
>197905290210000 197905290235000
>197905290305000 197905290400000
>197905290430000 197905290500000
>197905290530000 197905290600000
>197905290650000 197905290740000
>197905290820000 197905290840000
>197905290920000 197905290945000
>197905291320000 197905291405000
>197905291530000 197905291555000
>197905291715000 197905291735000
>197905291820000 197905291850000
>197905291925000 197905292000000
>197905292105000 197905292125000
>197905292200000 197905292235000
>197905292305000 197905292345000
>197905300020000 197905300050000
>197905300125000 197905300150000
>197905300230000 197905300305000
>197905300340000 197905300450000
>197905300530000 197905300610000
>197905300655000 197905300720000
>197905300825000 197905300900000
>197905300945000 197905301030000
>197905301115000 197905301150000
>197905301200000 197905301200000
>197905301210000 197905301210000
>197905301330000 197905301415000
>197905301535000 197905301625000
>197905301745000 197905301820000
>197905301945000 197905302025000
>197905302055000 197905302125000
>197905302205000 197905302235000
>197905302320000 197905302345000
>197905310025000 197905310055000
>197905310140000 197905310235000
>197905310330000 197905310415000
>197905310520000 197905310545000
>197905310650000 197905310715000
>197905310800000 197905310830000
>197905310850000 197905310855000
>197905311945000 197906010100000
>197906010110000 197906010430000
>197906010500000 197906010535000
>197906010555000 197906010645000
>197906010705000 197906010945000
>197906010955000 197906011345000
>YYYYMMDDHHMMSST YYYYMMDDHHMMSST
Unspecified
Unspecified
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
>04/08/96 CLINT MOG$DUB3:[PMG.CLINT.SHARK]D-1-79-EG.051;1
>MOG$DUB0:[PROGRAMS.REFMT]VMS2UNIX.EXE;1
>Integrated navigation (SINS) data
>
>Input was...
>01/06/86 KAYE DISK$USERDISK:[KAYE.MISCLEE]D179EG.050;
>DRB0:[DRS.REFMT]REFORMAT.EXE;5
>Original filename d179eg.nav.
>
19960408
U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG)
Carolyn H. Degnan
Geophysicist
mailing and physical address
USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
Santa Cruz
CA
95060-5792
USA
(831) 460-7452
(831) 427-4748
infobank@octopus.wr.usgs.gov
Below are the details about which processing steps were taken by the DAPS group that can be found in the header information of the ASCII files downloaded from InfoBank.
Bathymetry Data
>10/31/1998 /lion/d/d179eg/bath/d-1-79-eg.305_051
>/bear/programs/edit/automerge/automerge
>
>Input was...
>04/08/96 CLINT MOG$DUB3:[PMG.CLINT.SHARK]D-1-79-EG.305;1
>MOG$DUB0:[PROGRAMS.REFMT]VMS2UNIX.EXE;1
>Raw depth (bathymetry) data
>
>02/24/86 BECKIE DISK$USERDISK:[CLINT.BECKIE]D179EG.305;
>DRB0:[DRS.REFMT]REFORMAT.EXE;5
>
>Input was...
>04/08/96 CLINT MOG$DUB3:[PMG.CLINT.SHARK]D-1-79-EG.051;1
>MOG$DUB0:[PROGRAMS.REFMT]VMS2UNIX.EXE;1
>Integrated navigation (SINS) data
>
>01/06/86 KAYE DISK$USERDISK:[KAYE.MISCLEE]D179EG.050;
>DRB0:[DRS.REFMT]REFORMAT.EXE;5
>Original filename d179eg.nav.
>
>time, lat, long, time(sec) to nearest nav fix, data values
19981031
U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG)
Carolyn H. Degnan
Geophysicist
mailing and physical address
USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
Santa Cruz
CA
95060-5792
USA
(831) 460-7452
(831) 427-4748
infobank@octopus.wr.usgs.gov
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.
d-1-79-eg.051.txt
2012
d179egnav.txt
Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey
Heather A. Schreppel
IT Management Specialist/Database Support Assistant
mailing and physical address
600 4th Street South
St. Petersburg
FL
33701
USA
727-803-8747 ext. 3013
hschreppel@usgs.gov
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/.
d-1-79-eg.305_051.txt
2012
d179egbathy.txt
Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey
Heather A. Schreppel
IT Management Specialist/Database Support Assistant
mailing and physical address
600 4th Street South
St. Petersburg
FL
33701
USA
727-803-8747 ext. 3013
hschreppel@usgs.gov
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.
d179egbathy.txt, d179egnav.txt
2012
d179egall.txt
Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey
Heather A. Schreppel
IT Management Specialist/Database Support Assistant
mailing and physical address
600 4th Street South
St. Petersburg
FL
33701
USA
727-803-8747 ext. 3013
hschreppel@usgs.gov
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
d179egall.txt
2012
d179eg.m77t
Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey
Heather A. Schreppel
IT Management Specialist/Database Support Assistant
mailing and physical address
600 4th Street South
St. Petersburg
FL
33701
USA
727-803-8747 ext. 3013
hschreppel@usgs.gov
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.
http://walrus.wr.usgs.gov/infobank/d/d179eg/html/d-1-79-eg.meta.html
2012
d179eg.h77t
Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey
Heather A. Schreppel
IT Management Specialist/Database Support Assistant
mailing and physical address
600 4th Street South
St. Petersburg
FL
33701
USA
727-803-8747 ext. 3013
hschreppel@usgs.gov
Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog.
20161229
U.S. Geological Survey
Alan O. Allwardt
Contractor -- Information Specialist
mailing and physical address
2885 Mission Street
Santa Cruz
CA
95060
831-460-7551
831-427-4748
aallwardt@usgs.gov
Added keywords section with USGS persistent identifier as theme keyword.
20201013
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Eastern Gulf of Alaska from 05/24/1979 to 06/01/1979
Point
Point
0.000001
0.000001
Decimal degrees
North American Datum of 1927
Clarke 1866
6378206.4
294.98
d179eg.m77t
MGD77T single-beam bathymetry data file for D179EG
NOAA's National Geophysical Data Center, See Hittelman and others (2010) Cross_Reference section above for details about the MGD77T format and citation information.
SURVEY_ID
Survey identifier supplied by the contributing organization
NGDC
This identifier varies in format and is supplied by the contributing organization
TIMEZONE
Time-zone correction
NGDC
In our datasets, no correction was applied. All values equal 0.
DATE
Survey Date
NGDC
19790525
19790601
YYYYMMDD, (four digit year, two digit month, two digit day)
TIME
Time
NGDC
0
2356
hours and decimal minutes
LAT
Latitude
North American Datum of 1927 (Clarke 1866) Geographic Coordinate System
57.005
59.76
decimal degrees
LON
Longitude
North American Datum of 1927 (Clarke 1866) Geographic Coordinate System
-141.66167
-117.13802
decimal degrees
POS_TYPE
Indicates how lat/lon was obtained
NGDC
1
Observed fix
NGDC
3
Interpolated fix
NGDC
nil
unspecified
NGDC
BAT_TTIME
Bathymetry, 2-way travel time
U.S. Geological Survey
0.03373
4.42373
seconds
d179eg.h77t
MGD77T single-beam bathymetry header file for D-1-79-EG
NOAA's National Geophysical Data Center, See Hittelman and others (2010) Cross_Reference section above for details about the MGD77T format and citation information.
SURVEY_ID
Survey identifier supplied by the contributing organization
NGDC
This identifier varies in format and is supplied by the contributing organization
FORMAT_77
Format Acronym
NGDC
Text string description
PARAMS_CO
Parameters surveyed codes.
NGDC
Status of geophysical parameters for this survey. See Hittelman and others (2010) from the Cross_Reference section above for details.
INST_SRC
Source Institution
NGDC
Text string description
COUNTRY
Country
NGDC
Text string description
PLATFORM
Platform name
NGDC
Text string description
PLAT_TYPCO
Platform type code
NGDC
nil
Unspecified
NGDC
1
Surface Ship
NGDC
2
Submersible Ship
NGDC
3
Aircraft
NGDC
4
Buoy
NGDC
5
Mobile land
NGDC
6
Fixed land
NGDC
7
Deep tow
NGDC
PLAT_TYP
Platform type
NGDC
Text string description
CHIEF
Chief Scientist(s)
NGDC
Text string description
PROJECT
Project, cruise, leg
NGDC
Text string description
FUNDING
funding
NGDC
Text string description
DATE_DEP
survey departure date
NGDC
19770427
20000629
YYYYMMDD (four digit year, two digit month, two digit day)
PORT_DEP
port of departure
NGDC
Text string description
DATE_ARR
survey arrival date
NGDC
19770427
20000629
YYYYMMDD (four digit year, two digit month, two digit day)
PORT_ARR
port of arrival
NGDC
Text string description
NAV_INSTR
navigation instrumentation
NGDC
Text string description
POS_INFO
position determination method/ geodetic datum
NGDC
Text string description
BATH_INSTR
bathymetry instrumentation
NGDC
Text string description
BATH_ADD
additional forms of bathymetry
NGDC
Text string description
LAT_TOP
Latitude
World Geodetic System 1984 Geographic Coordinate System
16.38240
89.98766
decimal degrees
LAT_BOTTOM
Latitude
World Geodetic System 1984 Geographic Coordinate System
16.38240
89.98766
decimal degrees
LON_LEFT
Longitude
World Geodetic System 1984 Geographic Coordinate System
10.30551
-117.13802
decimal degrees
LON_RIGHT
Longitude
World Geodetic System 1984 Geographic Coordinate System
10.30551
-117.13802
decimal degrees
BATH_DRATE
general digitizing rate of bathymetry
NGDC
Text string description
SOUND_VEL
assumed sound velocity
NGDC
Text string description
VDATUM_CO
bathymetric vertical datum
NGDC
In our datasets, no correction was applied. All values equal 0.
Bathymetry and navigation data for U.S. Geological Survey bathymetry survey D-1-79-EG in MGD77T format.
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.
20201013
Heather A. Schreppel
Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey
IT Management Specialist/Database Support Assistant
mailing and physical address
U.S. Geological Survey, 600 Fourth Street South
St. Petersburg
FL
33701
USA
(727) 803-8747, ext. 3013
hschreppel@usgs.gov
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998