l384sp.m77t - MGD77 data file for Geophysical data from field activity L-3-84-SP in Tonga, Southern Pacific from 04/02/1984 to 05/01/1984

Frequently anticipated questions:

• What does this data set describe?
  1. How might this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  3. What similar or related data should the user be aware of?
• How reliable are the data; what problems remain in the data set?
  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How might this data set be cited?
   U.S. Geological Survey, and Coastal and Marine Geology Program, 2013, l384sp.m77t - MGD77 data file for Geophysical data from field activity L-3-84-SP in Tonga, Southern Pacific from 04/02/1984 to 05/01/1984: U.S. Geological Survey, Menlo Park, CA.

   Online Links:

   • http://www.ngdc.noaa.gov/mgg/trk/trackline/samuel_p._lee/l384sp/mgd77/

   This is part of the following larger work.
   Steele, Wm. Clinton, Degnan, Carolyn H., Deeter, Gary B., and Riordan, Jean A., 1980, DESCRIPTION OF MARINE GEOPHYSICAL DATA COLLECTED BY THE U.S. GEOLOGICAL SURVEY AND HOW TO OBTAIN IT: U.S. Geological Survey Open File Report 167, U.S. Geological Survey, Menlo Park, CA.

   Online Links:

   • http://pubs.usgs.gov/of/1989/0167/report.pdf

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: 178.39099
   East_Bounding_Coordinate: -174.74606
   North_Bounding_Coordinate: -18.13553
   South_Bounding_Coordinate: -26.50575
   

3. What does it look like?
4. Does the data set describe conditions during a particular time period?

   Beginning_Date: 02-Apr-1984

   Ending_Date: 01-May-1984

   Currentness_Reference:

   ground condition

5. What is the general form of this data set?

   Geospatial_Data_Presentation_Form: tab-delimited ASCII text files
   

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?
      

      Indirect_Spatial_Reference: Tonga, Southern Pacific
      

      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point
   2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.25722210100002.
      
7. How does the data set describe geographic features?

   l384sp.m77t

   MGD77T single-beam bathymetry data file for L384SP (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.)

   SURVEY_ID

   Survey identifier supplied by the contributing organization (Source: NGDC) This identifier varies in format and is supplied by the contributing organization

   TIMEZONE

   Time-zone correction (Source: NGDC) In our datasets, no correction was applied. All values equal 0.

   DATE

   YYYYMMDD (Source: NGDC)

   Range of values
   Minimum:	19840402
   Maximum:	19840501
   Units:	Year, month, day

   TIME

   Time (Source: NGDC)

   Range of values
   Minimum:	0
   Maximum:	2359.933
   Units:	hours and decimal minutes

   LAT

   Latitude (Source: World Geodetic System 1984 Geographic Coordinate System)

   Range of values
   Minimum:	-26.50575
   Maximum:	-18.13553
   Units:	decimal degrees

   LON

   Longitude (Source: World Geodetic System 1984 Geographic Coordinate System)

   Range of values
   Minimum:	-179.99976
   Maximum:	179.99999
   Units:	decimal degrees

   POS_TYPE

   Indicates how lat/lon was obtained (Source: NGDC)

   Range of values
   Minimum:	1
   Maximum:	3
   Units:	1 = observed fix, 3 = interpolated fix, nil = unspecified

   BAT_TTIME

   Bathymetry, 2-way travel time (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0.158
   Maximum:	13.8
   Units:	seconds

   CORR_DEPTH

   Bathymetry, corrected depth (Source: U.S. Geological Survey)

   Range of values
   Minimum:	188.5
   Maximum:	10747.4
   Units:	decimal meters

   BAT_CPCO

   Bathymetric Correction code - details the procedure used for determining the sound velocity correction to depth (Source: NGDC)

   Range of values
   Minimum:	63
   Maximum:	63
   Units:	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 (Source: NGDC)

   Range of values
   Minimum:	1
   Maximum:	3
   Units:	1 - Observed, 3 - Interpolated (Header Seq. 12), 9 - Unspecified

   MAG_TOT

   Magnetics total field - 1st sensor (Source: NGDC)

   Range of values
   Minimum:	36667.7
   Maximum:	48911.7
   Units:	gammas

   MAG_RES

   Magnetics residual field field (Source: NGDC)

   Range of values
   Minimum:	-9038
   Maximum:	4267.4
   Units:	gammas

   GRA_OBS

   Observed gravity (Source: NGDC)

   Range of values
   Minimum:	977000
   Maximum:	977209.4
   Units:	milligals

   EOTVOS

   EOTVOS correction - E = 7.5 V cos(phi) * sin(alpha) + 0.0042 V*V (Source: NGDC)

   Range of values
   Minimum:	-169.7
   Maximum:	71
   Units:	milligals

   FREEAIR

   Free-air Anomaly = G(observed) minus G(theoretical) (Source: NGDC)

   Range of values
   Minimum:	-352.3
   Maximum:	227
   Units:	milligals

   LINEID

   LINE/TRACK/SEGMENT ID (Source: NGDC)

   Range of values
   Minimum:	2
   Maximum:	19
   Units:	Used, for example, to cross reference with seismic data.

   POINTID

   SEISMIC SHOT-POINT NUMBER/POINT ID (Source: NGDC)

   Range of values
   Minimum:	41
   Maximum:	9081
   Units:	Used, for example, to cross reference with seismic data.

   Entity_and_Attribute_Overview:

   Bathymetry, gravity, magnetic, and navigation data for U.S. Geological Survey bathymetry survey L384SP in MGD77T format.

   Entity_and_Attribute_Detail_Citation:

   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.

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • U.S. Geological Survey
   • Coastal and Marine Geology Program
2. Who also contributed to the data set?

   Rick Herzer (Chief Scientist, NZ)

3. To whom should users address questions about the data?
   Gregory K. Miller

   U.S. Geological Survey

   Physical Scientist

   600 4th Street South

   St. Petersburg, FL
   

   USA

   (727) 803-8747, ext. 3020 (voice)

   gmiller@usgs.gov

Why was the data set created?

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/ ).

How was the data set created?

1. From what previous works were the data drawn?
2. How were the data generated, processed, and modified?

   Date: 27-Oct-2000 (process 1 of 7)

   Navigation Data >Converted to time format with year at start. > >07/12/85 CLINT DRS$DATA:[L384SP.N]L384SP.073; >DRB0:[DRS.FILT]FILTER.EXE; >parameters = 0.0 0.022222222 50 70 > >Input was... >07/08/85 BARB DRS$DATA:[L384SP.N]L384SP.072; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >07/08/85 BARB DRS$DATA:[L384SP.N]DESAM.058; >DRB0:[DRS.DSMPL]DESAMTIME.EXE;1 > >07/08/85 BARB DRS$DATA:[L384SP.N]L384SP.058; >DRB0:[DRS.EDIT]MERGEIT.EXE; > >03/15/85 KAYE USR$DISK:[DRS.DATA.L3.N.TEMP]NEWMINSAT.050; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 > Person who carried out this activity:
   

   U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)

   Attn: Carolyn H. Degnan

   Geophysicist

   USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive

   Santa Cruz, CA
   

   USA

   (831) 460-7452 (voice)

   (831) 427-4748 (FAX)

   infobank@octopus.wr.usgs.gov

   Date: 02-Nov-2000 (process 2 of 7)

   Gravity Data >10/31/1998 /tiger/l/l384sp/grav/l-3-84-sp.162_073 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >07/01/88 CAROLYN DRS$DATA:[L384SP.G]L384SP.162; >DUA0:[DRS.PLT.GRAPHED]GRAPHED.EXE; >Free Air Anomaly data >hand edited out spikes in FAA field > >Input was... >Converted to time format with year at start. > >07/12/85 CLINT DRS$DATA:[L384SP.N]L384SP.073; >DRB0:[DRS.FILT]FILTER.EXE; >parameters = 0.0 0.022222222 50 70 > >07/08/85 BARB DRS$DATA:[L384SP.N]L384SP.072; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >07/08/85 BARB DRS$DATA:[L384SP.N]DESAM.058; >DRB0:[DRS.DSMPL]DESAMTIME.EXE;1 > >07/08/85 BARB DRS$DATA:[L384SP.N]L384SP.058; >DRB0:[DRS.EDIT]MERGEIT.EXE; > >03/15/85 KAYE USR$DISK:[DRS.DATA.L3.N.TEMP]NEWMINSAT.050; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 > >time, lat, long, time(sec) to nearest nav fix, data values Person who carried out this activity:
   

   U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)

   Attn: Carolyn H. Degnan

   Geophysicist

   USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive

   Santa Cruz, CA
   

   USA

   (831) 460-7452 (voice)

   (831) 427-4748 (FAX)

   infobank@octopus.wr.usgs.gov

   Date: 20-Jun-2012 (process 3 of 7)

   Magnetics Data >06/20/2012 carolyn l-3-84-sp.223_073 > >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/magred1111/magred1111.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/l384sp/mag/l-3-84-sp.222_073 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >06/21/88 CAROLYN DRS$DATA:[L384SP.M]L384SP.222; >DUA0:[DRS.PLT]GRAPHED.EXE; >Edited magnetics data > >06/21/88 CAROLYN DRS$DATA:[L384SP.M]L384SP.221; >DUA0:[DRS.NGDC]DESPIKE.EXE; >Edited magnetics data >deleted spikes greater than +/- 3000.0 gammas > >06/21/88 CAROLYN DRS$DATA:[L384SP.M]L384SP.220; >DUA0:[DRS.MAG]MAGRED.EXE;5 >Edited magnetics data >DGRF80 & IGRF85 > >10/20/86 CAROLYN DRS$DATA:[L384SP]L384SP.201; >DUA0:[DRS.REFMT]REFORMAT.EXE;5 >was USR$DISK:[DRS.DATA.L3.M]L384SP.200;1 2-NOV-1984 on DISCO > >07/12/85 CLINT DRS$DATA:[L384SP.N]L384SP.073; >DRB0:[DRS.FILT]FILTER.EXE; >parameters = 0.0 0.022222222 50 70 > >07/08/85 BARB DRS$DATA:[L384SP.N]L384SP.072; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >07/08/85 BARB DRS$DATA:[L384SP.N]DESAM.058; >DRB0:[DRS.DSMPL]DESAMTIME.EXE;1 > >07/08/85 BARB DRS$DATA:[L384SP.N]L384SP.058; >DRB0:[DRS.EDIT]MERGEIT.EXE; > >03/15/85 KAYE USR$DISK:[DRS.DATA.L3.N.TEMP]NEWMINSAT.050; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 > >Converted to time format with year at start. > >07/12/85 CLINT DRS$DATA:[L384SP.N]L384SP.073; >DRB0:[DRS.FILT]FILTER.EXE; >parameters = 0.0 0.022222222 50 70 > >07/08/85 BARB DRS$DATA:[L384SP.N]L384SP.072; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >07/08/85 BARB DRS$DATA:[L384SP.N]DESAM.058; >DRB0:[DRS.DSMPL]DESAMTIME.EXE;1 > >07/08/85 BARB DRS$DATA:[L384SP.N]L384SP.058; >DRB0:[DRS.EDIT]MERGEIT.EXE; > >03/15/85 KAYE USR$DISK:[DRS.DATA.L3.N.TEMP]NEWMINSAT.050; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 > >time, lat, long, time(sec) to nearest nav fix, data values Person who carried out this activity:
   

   U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)

   Attn: Carolyn H. Degnan

   Geophysicist

   USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive

   Santa Cruz, CA
   

   USA

   (831) 460-7452 (voice)

   (831) 427-4748 (FAX)

   infobank@octopus.wr.usgs.gov

   Date: 31-Oct-1998 (process 4 of 7)

   Bathymetry Data >10/31/1998 /tiger/l/l384sp/bath/l-3-84-sp.331_073 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >06/23/88 CAROLYN DRS$DATA:[L384SP.B]L384SP.331; >DUA0:[DRS.PLT.GRAPHED]GRAPHED.EXE; >Edited bathymetry data > >05/01/85 BECKIE USR$DISK:[DRS.DATA.L384SP.B]L384SP.330; >DRA1:[DRS.BAT]BATRED.EXE;1 >This is clean hand-digetized bathymetry. > >05/01/85 BECKIE USR$DISK:[DRS.DATA.L384SP.B]L384SP.310; >DRA1:[DRS.REFMT]REFORMAT.EXE;4 >This file contains edited hand-digetized bathy. > >Input was... >Converted to time format with year at start. > >07/12/85 CLINT DRS$DATA:[L384SP.N]L384SP.073; >DRB0:[DRS.FILT]FILTER.EXE; >parameters = 0.0 0.022222222 50 70 > >07/08/85 BARB DRS$DATA:[L384SP.N]L384SP.072; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >07/08/85 BARB DRS$DATA:[L384SP.N]DESAM.058; >DRB0:[DRS.DSMPL]DESAMTIME.EXE;1 > >07/08/85 BARB DRS$DATA:[L384SP.N]L384SP.058; >DRB0:[DRS.EDIT]MERGEIT.EXE; > >03/15/85 KAYE USR$DISK:[DRS.DATA.L3.N.TEMP]NEWMINSAT.050; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 > >time, lat, long, time(sec) to nearest nav fix, data values Person who carried out this activity:
   

   U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)

   Attn: Carolyn H. Degnan

   Geophysicist

   USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive

   Santa Cruz, CA
   

   USA

   (831) 460-7452 (voice)

   (831) 427-4748 (FAX)

   infobank@octopus.wr.usgs.gov

   Date: 20-Jun-2012 (process 5 of 7)

   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. Person who carried out this activity:
   

   U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG)

   Attn: Carolyn H. Degnan

   Geophysicist

   USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive

   Santa Cruz, CA
   

   USA

   (831) 460-7452 (voice)

   (831) 427-4748 (FAX)

   infobank@octopus.wr.usgs.gov

   Date: 01-Feb-2017 (process 6 of 7)

   Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. Person who carried out this activity:
   

   U.S. Geological Survey

   Attn: Alan O. Allwardt

   Contractor -- Information Specialist

   2885 Mission Street

   Santa Cruz, CA
   

   831-460-7551 (voice)

   831-427-4748 (FAX)

   aallwardt@usgs.gov

   Date: 19-Oct-2020 (process 7 of 7)

   Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. Person who carried out this activity:
   

   U.S. Geological Survey

   Attn: VeeAnn A. Cross

   Marine Geologist

   384 Woods Hole Road

   Woods Hole, MA
   

   508-548-8700 x2251 (voice)

   508-457-2310 (FAX)

   vatnipp@usgs.gov

3. What similar or related data should the user be aware of?
   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: National Geophysical Data Center, National Oceanic and Atmospheric Administration, Boulder, CO.

   Online Links:

   • http://www.ngdc.noaa.gov/mgg/dat/geodas/docs/mgd77.pdf

   Other_Citation_Details: 25 p.
   

How reliable are the data; what problems remain in the data set?

1. How well have the observations been checked?
   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.
2. How accurate are the geographic locations?
   Unspecified
3. How accurate are the heights or depths?
   Unspecified
4. Where are the gaps in the data? What is missing?
   Start and end date/times of data >Navigation Data (l-3-84-sp.073) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198404020302590 198404020440590 >198404020455390 198404020520000 >198404020550590 198404021249390 >198404021305000 198404041240000 >198404041255000 198404051215000 >198404051230000 198404061400000 >198404061420000 198404130546000 >198404130601000 198404182220000 >198404201732000 198404280558000 >198404280635390 198405010132390 >198405010148000 198405012118000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (l-3-84-sp.162_073) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198404020544000 198404022241000 >198404030556400 198404050302400 >198404050308200 198404060000000 >198404070037200 198404070351000 >198404070358000 198404110216400 >198404110230200 198404120145400 >198404120706200 198404142343400 >198404142349200 198404162332000 >198404162337400 198404182248200 >198404201728200 198404230511000 >198404230524000 198404251738400 >198404251749400 198404251931000 >198404251937000 198404301558400 >198404301624400 198405012034000 >198405012106000 198405012117000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (l-3-84-sp.223_073) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198404030821400 198404040759000 >198404040805000 198404050304400 >198404050310200 198404050803000 >198404050809000 198404060758400 >198404060804400 198404061829000 >198404061900400 198404070353200 >198404070400000 198404070559000 >198404070604400 198404070810200 >198404070904200 198404071425400 >198404071544400 198404080758400 >198404080804400 198404090802400 >198404090808400 198404100759000 >198404100805000 198404110217400 >198404110232200 198404110811000 >198404110817000 198404120758200 >198404120804200 198404130803200 >198404130809200 198404140759000 >198404140805000 198404142346000 >198404142351200 198404150759000 >198404150805000 198404160343400 >198404160811400 198404161216200 >198404180558400 198404181020400 >198404181303000 198404181332000 >198404181445000 198404181751000 >198404181757000 198404182019200 >198404202120400 198404210801400 >198404212052200 198404212349200 >198404220628200 198404220712200 >198404220809200 198404221320200 >198404221423200 198404221624200 >198404221643200 198404221743200 >198404230124200 198404230626000 >198404230938000 198404231235200 >198404231254200 198404231408200 >198404240637400 198404241318000 >198404250503400 198404250712200 >198404251312200 198404251901400 >198404260742400 198404260810400 >198404260837400 198404261105200 >198404270249000 198404270813400 >198404271322000 198404271555200 >198404271614200 198404271910200 >198404280332000 198404281031400 >198404281304400 198404281402400 >198404281421400 198404290800400 >198404290819400 198404290834400 >198404300000400 198404300118400 >198404300812200 198404301250200 >198404302345400 198405011200200 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-3-84-sp.331_073) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198404031101180 198404041116540 >198404041127540 198404050300360 >198404050345240 198404060328000 >198404060340480 198404061420000 >198404061430060 198404071352060 >198404071405240 198404071405240 >198404071415540 198404071723300 >198404071745360 198404090926120 >198404090940240 198404090942540 >198404090953000 198404090953000 >198404091005360 198404091434540 >198404091505300 198404101229540 >198404101241120 198404110159540 >198404110212060 198404110938240 >198404110951540 198404111057540 >198404111109480 198404111258480 >198404111309000 198404111334300 >198404111422480 198404111919360 >198404111930060 198404112026180 >198404112040000 198404112230360 >198404112241360 198404112305300 >198404112318000 198404120059480 >198404120138420 198404120415000 >198404120428120 198404120451180 >198404120502120 198404131412240 >198404131452480 198404140502000 >198404140512300 198404150029180 >198404150040120 198404151015180 >198404151026060 198404151229300 >198404151239480 198404151719000 >198404151757000 198404160039420 >198404160050180 198404160428060 >198404160805540 198404161345420 >198404162115540 198404162223060 >198404162233120 198404162256180 >198404162307300 198404162348120 >198404180559180 198404180843240 >198404180854240 198404181020120 >198404181308360 198404181340180 >198404181350360 198404182013240 >198404202019300 198404210111180 >198404210125060 198404210902360 >198404210914540 198404211007120 >198404211021060 198404211050120 >198404211101300 198404211415540 >198404211839480 198404212354000 >198404220632480 198404221651420 >198404230114180 198404231408120 >198404240706060 198404241205180 >198404241233300 198404241308240 >198404250514480 198404251040060 >198404251315180 198404252220060 >198404260750360 198404261338540 >198404261933240 198404270553120 >198404270603240 198404270810420 >198404271403060 198404271529540 >198404271558120 198404271559540 >198404271630480 198404271829480 >198404271843300 198404271909000 >198404280222000 198404280233300 >198404280245360 198404280255180 >198404280347540 198404280404240 >198404280426420 198404281031360 >198404281307180 198404291545480 >198404292359060 198404300106180 >198404300819360 198404301246120 >198404302347180 198405011004300 >198405011018240 198405011159540 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Seismic Shots Data (l-3-84-sp.421_073) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198404031121190 198404031727060 >198404031735040 198404041200350 >198404041213110 198404041459520 >198404041556020 198404050259480 >198404050343060 198404060354240 >198404060404090 198404071745240 >198404071840170 198404081316050 >198404081323100 198404091434590 >198404091505180 198404100337170 >198404100510170 198404101559480 >198404101645150 198404111334580 >198404111415300 198404120059580 >198404120137180 198404130700120 >198404130735590 198404131412440 >198404131450130 198404151229540 >198404151345140 198404151720050 >198404151755140 198404160244550 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST
5. How consistent are the relationships among the observations, including topology?
   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.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None. These data are held in the public domain.
Use_Constraints:

This information is not intended for navigational purposes. Read and fully comprehend the metadata prior to data use. Uses of these data should not violate the spatial resolution of the data. Where these data are used in combination with other data of different resolution, the resolution of the combined output will be limited by the lowest resolution of all the data. Acknowledge the U.S. Geological Survey in products derived from these data. Share data products developed using these data with the U.S. Geological Survey.This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.Although this Federal Geographic Data Committee-compliant metadata file is intended to document these data in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.

1. Who distributes the data set? (Distributor 1 of 1)
   
   U.S. Geological Survey

   345 Middlefield Road MS 999

   Menlo Park, CA
   

   USA

   (650) 329-5078 (voice)

   (650) 329-5190 (FAX)
2. What's the catalog number I need to order this data set? Downloadable Data
3. What legal disclaimers am I supposed to read?

   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.

4. How can I download or order the data?
   • Availability in digital form:

     Data format:	tab-delimited ASCII text files. in format MGD77t (version 10) MGD77 Size: 4.0
     Network links:	http://www.ngdc.noaa.gov/mgg/trk/trackline/samuel_p._lee/l384sp/mgd77/

   • Cost to order the data: None

Who wrote the metadata?

Dates:

Last modified: 19-Oct-2020

Metadata author:

Gregory K. Miller

U.S. Geological Survey

Physical Scientist

U.S. Geological Survey, 600 Fourth Street South

St. Petersburg, FL

USA

(727) 803-8747, ext. 3020 (voice)

gmiller@usgs.gov

Metadata standard:

FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)