U.S. Geological Survey
Coastal and Marine Geology Program
2013
f991cp.m77t and f991cp.h77t: MGD77T data and header files for single-beam bathymetry data for field activity F-9-91-CP in Central Pacific from 09/24/1991 to 09/25/1991
tab-delimited ASCII text files
St. Petersburg, FL
U.S. Geological Survey
http://pubs.usgs.gov/ds/757/data/m77t/f991cp.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 GPS navigation data was collected as part of the U.S. Geological Survey cruise F-9-91-CP. The cruise was conducted in the Central Pacific from September 24 to September 25, 1991. The chief scientists was Jim Gardner from the USGS Coastal and Marine Geology office in Menlo Park, CA. The geophysical source was a 10 kilohertz (kHz) and 3.5 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/f/f991cp/html/f-9-91-cp.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 digitally collected using a Global Positioning System (GPS). The GPS is a space-based satellite navigation system maintained by the United States government and is accessible using a GPS receiver. Data accuracy is based on individual receiver models, and most GPS data are collected in the WGS84 horizontal datum.
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 both digitally and as analog records with 10 kHz and 3.5 kHz systems. 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.
19910924
19910925
ground condition
None planned
-159.35820
-157.32581
21.41710
20.45990
USGS Metadata Identifier
USGS:43dbefa2-4c9b-4be0-bf16-2d29c74eb765
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 Hawaii
Central Pacific Ocean
Pacific Ocean
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
Jim Gardner (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 (f-9-91-cp.050 [SINS])
>YYYYMMDDHHMMSST YYYYMMDDHHMMSST
>199109240636000 199109240704000
>199109240714000 199109240727000
>199109240734000 199109240838000
>199109240845000 199109240905000
>199109240911000 199109241346000
>199109241355000 199109241359000
>199109241406000 199109241406000
>199109241412000 199109241412000
>199109241419000 199109250208000
>YYYYMMDDHHMMSST YYYYMMDDHHMMSST
>Bathymetry Data (f-9-91-cp.300_050)
>YYYYMMDDHHMMSST YYYYMMDDHHMMSST
>199109240636000 199109240636000
>199109240642000 199109240642000
>199109240648000 199109240648000
>199109240654000 199109240654000
>199109240700000 199109240700000
>199109240718000 199109240718000
>199109240724000 199109240724000
>199109240736000 199109240736000
>199109240742010 199109240742010
>199109240748000 199109240748000
>199109240754000 199109240754000
>199109240800000 199109240800000
>199109240806000 199109240806000
>199109240812000 199109240812000
>199109240818000 199109240818000
>199109240824000 199109240824000
>199109240830000 199109240830000
>199109240836000 199109240836000
>199109240848000 199109240848000
>199109240854000 199109240854000
>199109240900000 199109240900000
>199109240912000 199109240912000
>199109240918000 199109240918000
>199109240924000 199109240924000
>199109240930000 199109240930000
>199109240936000 199109240936000
>199109240942000 199109240942000
>199109240948000 199109240948000
>199109240954000 199109240954000
>199109241000000 199109241000000
>199109241006000 199109241006000
>199109241012000 199109241012000
>199109241018000 199109241018000
>199109241024000 199109241024000
>199109241030000 199109241030000
>199109241036000 199109241036000
>199109241042000 199109241042000
>199109241048000 199109241048000
>199109241054000 199109241054000
>199109241100000 199109241100000
>199109241106000 199109241106000
>199109241112000 199109241112000
>199109241118000 199109241118000
>199109241124000 199109241124000
>199109241130000 199109241130000
>199109241136000 199109241136000
>199109241142000 199109241142000
>199109241148000 199109241148000
>199109241154000 199109241154000
>199109241200000 199109241200000
>199109241206000 199109241206000
>199109241212000 199109241212000
>199109241218000 199109241218000
>199109241224000 199109241224000
>199109241230000 199109241230000
>199109241236000 199109241236000
>199109241242000 199109241242000
>199109241248000 199109241248000
>199109241254000 199109241254000
>199109241300000 199109241300000
>199109241306000 199109241306000
>199109241312000 199109241312000
>199109241318000 199109241318000
>199109241324000 199109241324000
>199109241330000 199109241330000
>199109241336000 199109241336000
>199109241342000 199109241342000
>199109241406000 199109241406000
>199109241412000 199109241412000
>199109241424000 199109241424000
>199109241430000 199109241430000
>199109241436000 199109241436000
>199109241442000 199109241442000
>199109241448000 199109241448000
>199109241454000 199109241454000
>199109241500000 199109241500000
>199109241506000 199109241506000
>199109241512000 199109241512000
>199109241518000 199109241518000
>199109241524000 199109241524000
>199109241530000 199109241530000
>199109241536000 199109241536000
>199109241542000 199109241542000
>199109241548000 199109241548000
>199109241554000 199109241554000
>199109241600000 199109241600000
>199109241606000 199109241606000
>199109241612000 199109241612000
>199109241618000 199109241618000
>199109241624000 199109241624000
>199109241630000 199109241630000
>199109241636000 199109241636000
>199109241642000 199109241642000
>199109241648000 199109241648000
>199109241654000 199109241654000
>199109241700000 199109241700000
>199109241706000 199109241706000
>199109241712000 199109241712000
>199109241718000 199109241718000
>199109241724000 199109241724000
>199109241730000 199109241730000
>199109241736000 199109241736000
>199109241742000 199109241742000
>199109241748000 199109241748000
>199109241754000 199109241754000
>199109241800000 199109241800000
>199109241806000 199109241806000
>199109241812000 199109241812000
>199109241818000 199109241818000
>199109241824000 199109241824000
>199109241830000 199109241830000
>199109241836000 199109241836000
>199109241842000 199109241842000
>199109241848000 199109241848000
>199109241854000 199109241854000
>199109241900000 199109241900000
>199109241906000 199109241906000
>199109241912000 199109241912000
>199109241918000 199109241918000
>199109241924000 199109241924000
>199109241930000 199109241930000
>199109241936000 199109241936000
>199109241942000 199109241942000
>199109241948000 199109241948000
>199109241954000 199109241954000
>199109242000000 199109242000000
>199109242006000 199109242006000
>199109242012000 199109242012000
>199109242018000 199109242018000
>199109242024000 199109242024000
>199109242030000 199109242030000
>199109242036000 199109242036000
>199109242042000 199109242042000
>199109242048000 199109242048000
>199109242054000 199109242054000
>199109242100000 199109242100000
>199109242106000 199109242106000
>199109242112000 199109242112000
>199109242118000 199109242118000
>199109242124000 199109242124000
>199109242130000 199109242130000
>199109242136000 199109242136000
>199109242142000 199109242142000
>199109242148000 199109242148000
>199109242154000 199109242154000
>199109242200000 199109242200000
>199109242206000 199109242206000
>199109242212000 199109242212000
>199109242218000 199109242218000
>199109242224000 199109242224000
>199109242230000 199109242230000
>199109242236000 199109242236000
>199109242242000 199109242242000
>199109242248000 199109242248000
>199109242254000 199109242254000
>199109242300000 199109242300000
>199109242306000 199109242306000
>199109242312000 199109242312000
>199109242318000 199109242318000
>199109242324000 199109242324000
>199109242330000 199109242330000
>199109242336000 199109242336000
>199109242342000 199109242342000
>199109242348000 199109242348000
>199109242354000 199109242354000
>199109250000000 199109250000000
>199109250006000 199109250006000
>199109250012000 199109250012000
>199109250018000 199109250018000
>199109250024000 199109250024000
>199109250030000 199109250030000
>199109250036000 199109250036000
>199109250042000 199109250042000
>199109250048000 199109250048000
>199109250054000 199109250054000
>199109250100000 199109250100000
>199109250106000 199109250106000
>199109250112000 199109250112000
>199109250118000 199109250118000
>199109250124000 199109250124000
>199109250130000 199109250130000
>199109250136000 199109250136000
>199109250142000 199109250142000
>199109250148000 199109250148000
>199109250154000 199109250154000
>199109250200000 199109250200000
>199109250206000 199109250206000
>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
>Converted to time format with year at start.
>
>10/01/91 CAROLYN PMG:[CAROLYN.RANI]F991CP.050;1
>ISDMNL$DUA12:[PMG.REFMT]REFORMAT.EXE;
>Integrated navigation (SINS) data
>simply reformatted from the DXFMT file sent by Rani, 9/30/91
>
19960205
U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG)
Carolyn H. Degnan
Geophysicist
mailing and physical address
USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
Santa Cruz
CA
95060-5792
USA
(831) 460-7452
(831) 427-4748
infobank@octopus.wr.usgs.gov
Below are the details about which processing steps were taken by the DAPS group that can be found in the header information of the ASCII files downloaded from InfoBank.
Bathymetry Data
>10/31/1998 /lion/f/f991cp/bath/f-9-91-cp.300_050
>/bear/programs/edit/automerge/automerge
>
>Input was...
>Converted to time format with year at start.
>
>10/01/91 CAROLYN PMG:[CAROLYN.RANI]F991CP.300;1
>ISDMNL$DUA12:[PMG.REFMT]REFORMAT.EXE;
>Raw depth (bathymetry) data
>simply reformatted from the DXFMT file sent by Rani, 9/30/91
>contained only uncorrected bathy
>
>Input was...
>Converted to time format with year at start.
>
>10/01/91 CAROLYN PMG:[CAROLYN.RANI]F991CP.050;1
>ISDMNL$DUA12:[PMG.REFMT]REFORMAT.EXE;
>Integrated navigation (SINS) data
>simply reformatted from the DXFMT file sent by Rani, 9/30/91
>
>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.
f-9-91-cp.050.txt
2012
f991cpnav.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/.
f-9-91-cp.300_050.txt
2012
f991cpbathy.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.
f991cpbathy.txt, f991cpnav.txt
2012
f991cpall.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
f991cpall.txt
2012
f991cp.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/f/f991cp/html/f-9-91-cp.meta.html.
2012
f991cp.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
Central Pacific Ocean from 09/24/1991 to 09/25/1991
Point
Point
0.000001
0.000001
Decimal degrees
D_WGS_1984
WGS_1984
6378137.000000
298.25722210100002
f991cp.m77t
MGD77T single-beam bathymetry data file for F991CP
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
19910924
19910925
YYYYMMDD, (four digit year, two digit month, two digit day)
TIME
Time
NGDC
0
2359
hours and decimal minutes
LAT
Latitude
World Geodetic System 1984 Geographic Coordinate System
20.4599
21.4171
decimal degrees
LON
Longitude
World Geodetic System 1984 Geographic Coordinate System
-159.3582
-157.3258
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
4.44667
6.25467
seconds
f991cp.h77t
MGD77T single-beam bathymetry header file for F-9-91-CP
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 F-9-91-CP 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