U.S. Geological Survey
Coastal and Marine Geology Program
2013
l1281np.m77t - MGD77 data file for Geophysical data from field activity L-12-81-NP in North Pacific Ocean from 09/19/1981 to 10/05/1981
tab-delimited ASCII text files
Menlo Park, CA
U.S. Geological Survey
http://www.ngdc.noaa.gov/mgg/trk/trackline/samuel_p._lee/l1281np/mgd77/
Wm. Clinton Steele
Carolyn H. Degnan
Gary B. Deeter
Jean A. Riordan
1980
DESCRIPTION OF MARINE GEOPHYSICAL DATA COLLECTED BY THE U.S. GEOLOGICAL SURVEY AND HOW TO OBTAIN IT
1.0
Digital Document
U.S. Geological Survey Open File Report
167
Menlo Park, CA
U.S. Geological Survey
http://pubs.usgs.gov/of/1989/0167/report.pdf
Single-beam bathymetry, gravity, and magnetic data along with DGPS navigation data was collected as part of field activity L-12-81-NP in North Pacific Ocean from 09/19/1981 to 10/05/1981, http://walrus.wr.usgs.gov/infobank/l/l1281np/html/l-12-81-np.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/l1281np/html/l-12-81-np.bath.html, http://walrus.wr.usgs.gov/infobank/l/l1281np/html/l-12-81-np.grav.html, and http://walrus.wr.usgs.gov/infobank/l/l1281np/html/l-12-81-np.mag.html into MGD77T format provided by the NOAA's National Geophysical Data Center(NGDC). The MGD77T format includes a header (documentation) file (.h77t) and a data file (.m77t). More information regarding this format can be found in the publication listed in the Cross_reference section of this metadata file.
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 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.
19810919
19811005
ground condition
None planned
-130.79816
-122.11925
45.35836
37.50413
USGS Metadata Identifier
USGS:d22fa95c-a643-4ef9-804f-5a937ba8f921
ISO 19115 Topic Category
geoscientificinformation
oceans
None
Marine Geology
Marine Geophysics
Marine Gravity Field
Marine Magnetic Field
Magnetic Anomalies
Bathymetry
Water Depth
Seafloor Topography
Data Categories for Marine Planning
distributions
bathymetry and elevation
Marine Realms Information Bank (MRIB) keywords
single-beam echo sounder
gravimetry
magnetic field observations
marine geophysics
USGS Thesaurus
single-beam echo sounder
bathymetry measurement
bathymetry
gravimeter measurement
magnetometer measurement
marine geophysics
Geographic Names Information System (GNIS)
North Pacific Ocean
Northern Pacific Ocean
Pacific Coast, USA
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.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.
Gregory K. Miller
U.S. Geological Survey
Physical Scientist
mailing and physical
600 4th Street South
St. Petersburg
FL
33701
USA
(727) 803-8747, ext. 3020
gmiller@usgs.gov
Dennis Mann (Chief Scientist); Don Tompkins (Chief Scientist)
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 >Navigation Data (l-12-81-np.053 [SINS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198109191714340 198109191830360 >198109191838360 198109192122360 >198109192154560 198109232232550 >198109232250500 198110051416000 >198110051544000 198110051544000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (l-12-81-np.161_053) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198109191725180 198109220826180 >198109220909300 198109231844000 >198109231856060 198109232037360 >198109232044240 198109250845000 >198109250850300 198109271033180 >198109271038540 198109271928300 >198109271934300 198109290654420 >198109290700000 198109302234480 >198109302240300 198110010653360 >198110010817060 198110020950540 >198110020959000 198110032122420 >198110032128420 198110051533000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (l-12-81-np.220_053) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198109230117550 198109231849000 >198109231901080 198109232043200 >198109232049240 198109252254560 >198109261710000 198109271038520 >198109271043560 198109271934040 >198109271939320 198109290659480 >198109290704520 198109291914160 >198109300208200 198110010658400 >198110010822040 198110020956480 >198110021004000 198110021157480 >198110021244440 198110032128040 >198110032133440 198110041533040 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-12-81-np.305_053) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Seismic Shots Data (l-12-81-np.420_053) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198109230303230 198109231406300 >198109231457400 198109231642080 >198109231716450 198109240124070 >198109240217440 198109242010570 >198109242054200 198109250144430 >198109250217490 198109250842500 >198109250944080 198109251331530 >198109251528530 198109252256220 >198109261920160 198109270446280 >198109270551300 198109271528450 >198109271616430 198109280159580 >198109280236080 198109282322590 >198109282329120 198109292255510 >198109292324580 198109300829190 >198109300908240 198110010129550 >198110010200180 198110011822530 >198110011857390 198110020748160 >198110020818040 198110020900310 >198110020907310 198110021127560 >198110021206220 198110031707260 >198110032010530 198110032235350 >198110032307040 198110040904400 >198110040935530 198110041530070 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST
Unspecified
Unspecified
Navigation Data >Converted to time format with year at start. > >10/21/85 KAYE DRS$DATA:[LD81NP.N]LC81NP.053; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 >
19960119
U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
Carolyn H. Degnan
Geophysicist
mailing and physical address
USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
Santa Cruz
CA
95060-5792
USA
(831) 460-7452
(831) 427-4748
infobank@octopus.wr.usgs.gov
Gravity Data >10/31/1998 /tiger/l/l1281np/grav/l-12-81-np.161_053 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >10/16/85 BARB DRS$DATA:[LC81NP.G]LC81NP.161; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 > >Input was... >Converted to time format with year at start. > >10/21/85 KAYE DRS$DATA:[LD81NP.N]LC81NP.053; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 > >time, lat, long, time(sec) to nearest nav fix, data values
19981031
U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
Carolyn H. Degnan
Geophysicist
mailing and physical address
USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
Santa Cruz
CA
95060-5792
USA
(831) 460-7452
(831) 427-4748
infobank@octopus.wr.usgs.gov
Magnetics Data >06/20/2012 carolyn l-12-81-np.220_053 > >Reprocessed using subroutines from Susan Macmillan's >IGRF SYNTHESIS PROGRAM http://www.ngdc.noaa.gov/IAGA/vmod/igrf11.f >with IGRF-11 coeffiecients integrated into the source code. >/infobank/programs/mag/magred11/magred11.for >Using geodetic coordinate system (Earth shape approximated by spheriod) >with altitude 0.0 km (for sea level). > >Input was... >10/31/1998 /tiger/l/l1281np/mag/l-12-81-np.200_053 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >10/07/85 CAROLYN DRS$DATA:[LC81NP.M]LC81NP.200; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 >was LC81NP._.MAGSB1 on TAM306 >was LC81NP220.DAT on VAM306 > >Converted to time format with year at start. > >10/21/85 KAYE DRS$DATA:[LD81NP.N]LC81NP.053; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 > >time, lat, long, time(sec) to nearest nav fix, data values
20120620
U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
Carolyn H. Degnan
Geophysicist
mailing and physical address
USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
Santa Cruz
CA
95060-5792
USA
(831) 460-7452
(831) 427-4748
infobank@octopus.wr.usgs.gov
Bathymetry Data >10/31/1998 /tiger/l/l1281np/bath/l-12-81-np.305_053 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >09/05/85 BECKIE DUA0:[DATA.LC81NP.B]LC81NP.305; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 >This file is hand-digetized bathymetry in cor- >rected meters in the Delgado Deep Sea Fan area. > >Input was... >Converted to time format with year at start. > >10/21/85 KAYE DRS$DATA:[LD81NP.N]LC81NP.053; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 > >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
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.
20120620
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
Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog.
20170201
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
Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed.
20201019
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
North Pacific Ocean
Point
Point
0.000001
0.000001
Decimal degrees
D_WGS_1984
WGS_1984
6378137.000000
298.25722210100002
l1281np.m77t
MGD77Tsingle-beam bathymetry, gravity, and magnetics data file for L1281NP
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
YYYYMMDD
NGDC
19810919
19811005
Year, month, day
TIME
Time
NGDC
0
2359
hours and decimal minutes
LAT
Latitude
World Geodetic System 1984 Geographic Coordinate System
37.50413
45.35836
decimal degrees
LON
Longitude
World Geodetic System 1984 Geographic Coordinate System
-130.79813
-122.11998
decimal degrees
POS_TYPE
Indicates how lat/lon was obtained
NGDC
1
3
1 = observed fix, 3 = interpolated fix, nil = unspecified
BAT_TTIME
Bathymetry, 2-way travel time
U.S. Geological Survey
1.0844
6.002
seconds
CORR_DEPTH
Bathymetry, corrected depth
U.S. Geological Survey
804.2
4497.4
decimal meters
BAT_CPCO
Bathymetric Correction code - details the procedure used for determining the sound velocity correction to depth
NGDC
63
63
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
BAT_TYPCO
Bathymetry type code - indicates how the bathymetric value was obtained
NGDC
1
3
1 - Observed, 3 - Interpolated (Header Seq. 12), 9 - Unspecified
MAG_TOT
Magnetics total field - 1st sensor
NGDC
48470
54364
gammas
MAG_RES
Magnetics residual field field
NGDC
-3182.7
2867.3
gammas
GRA_OBS
Observed gravity
NGDC
979838.2
980695
milligals
EOTVOS
EOTVOS correction - E = 7.5 V cos(phi) * sin(alpha) + 0.0042 V*V
NGDC
-247.6
69.3
milligals
FREEAIR
Free-air Anomaly = G(observed) minus G(theoretical)
NGDC
-394.1
207
milligals
Bathymetry, gravity, magnetic, and navigation data for U.S. Geological Survey bathymetry survey L1281NP in MGD77T format.
Attributes are obtained from MGD77T data files created from the navigation gravity, magnetic, 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.
U.S. Geological Survey
mailing and physical address
345 Middlefield Road MS 999
Menlo Park
CA
94025
USA
(650) 329-5078
(650) 329-5190
Downloadable Data
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.
MGD77t
10
MGD77
tab-delimited ASCII text files.
1.9
http://www.ngdc.noaa.gov/mgg/trk/trackline/samuel_p._lee/l1281np/mgd77/
Data are available for download on the World Wide Web (WWW).
None
20201019
Gregory K. Miller
U.S. Geological Survey
Physical Scientist
mailing and physical address
U.S. Geological Survey, 600 Fourth Street South
St. Petersburg
FL
33701
USA
(727) 803-8747, ext. 3020
gmiller@usgs.gov
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998