U.S. Geological Survey Coastal and Marine Geology Program 2013 tab-delimited ASCII text files Menlo Park, CA U.S. Geological Survey http://www.ngdc.noaa.gov/mgg/trk/trackline/united_geo_i/u371cb/mgd77/ Wm. Clinton Steele Carolyn H. Degnan Gary B. Deeter Jean A. Riordan 1980 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 transit satellite navigation data was collected as part of field activity UGEOLEG_3 (U-3-71-CB) in Eastern Greater Antilles, Caribbean from 07/17/1971 to 08/04/1971, http://walrus.wr.usgs.gov/infobank/u/u371cb/html/u-3-71-cb.meta.html The geophysical source was a Knudsen 12 kHz 320B/R echosounder. 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/u/u371cb/html/u-3-71-cb.bath.html http://walrus.wr.usgs.gov/infobank/u/u371cb/html/u-3-71-cb.grav.html and http://walrus.wr.usgs.gov/infobank/u/u371cb/html/u-3-71-cb.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 interpo- lated. 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. 19710717 19710804 ground condition Complete None planned -68.99670 -58.58530 30.28710 15.37500 USGS Metadata Identifier USGS:1d13222a-6821-428e-b504-8bff681cf198 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) Caribbean Sea Eastern Greater Antilles, Caribbean North Atlantic 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. 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 Louis Garrison (Chief Scientist, USGS Corpus Christi) Hittelman, Allen M., Groman, Robert C., Haworth, Richard T., Holcombe, Troy L., McHendrie, Graig, Smith, Stuart M., and Metzger, Dan R. 2010 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 (u-3-71-cb.050 [SINS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197107171951420 197107220230000 >197107220240000 197107220240000 >197107220250000 197107220250000 >197107220300000 197107220300000 >197107220310000 197107220310000 >197107220320000 197107220320000 >197107220330000 197107220330000 >197107220340000 197107220340000 >197107220350000 197107220350000 >197107220400000 197107220400000 >197107220410000 197107220410000 >197107220420000 197107220420000 >197107220430000 197107220430000 >197107220440000 197107220838000 >197107221805000 197107221915000 >197107222302000 197107222302000 >197107222310000 197107222310000 >197107222320000 197107222320000 >197107222330000 197107240744000 >197107241420000 197107291625000 >197107291655000 197108010545000 >197108010555000 197108040600000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (u-3-71-cb.160_050) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197107171955000 197107172000000 >197107172010000 197107180825000 >197107180835000 197107190410000 >197107190425000 197107190740000 >197107190750000 197107201225000 >197107201235000 197107201250000 >197107201300000 197107201510000 >197107201525000 197107202355000 >197107210005000 197107220230000 >197107220440000 197107220835000 >197107221805000 197107221915000 >197107222330000 197107230945000 >197107231005000 197107232125000 >197107232140000 197107240740000 >197107241420000 197107242225000 >197107242235000 197107250840000 >197107250850000 197107261610000 >197107261620000 197107261935000 >197107261955000 197107262055000 >197107262105000 197107280000000 >197107280010000 197107280700000 >197107280720000 197107281735000 >197107281745000 197107291445000 >197107291455000 197107291625000 >197107291655000 197107291715000 >197107291725000 197107291835000 >197107291855000 197107310615000 >197107310630000 197107311145000 >197107311155000 197108010545000 >197108010555000 197108011725000 >197108011830000 197108030130000 >197108030140000 197108030545000 >197108030610000 197108030955000 >197108031005000 197108040600000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (u-3-71-cb.220_050) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197107171951420 197107172012180 >197107172022360 197107172022360 >197107172103060 197107172108000 >197107172114480 197107172335360 >197107172342360 197107180000420 >197107180259480 197107180259480 >197107180307480 197107202016300 >197107202022480 197107210748420 >197107230116060 197107240510420 >197107240519000 197107240743240 >197107242253000 197107251541540 >197107251550060 197107251550060 >197107251556180 197107271649000 >197107271656360 197107290033000 >197107290039120 197107291616360 >197107291720000 197107292355000 >197107300130120 197107300226540 >197107300232060 197107300308480 >197107300314000 197107300406180 >197107300424000 197107300534180 >197107300540540 197107300708300 >197107300714360 197107300737480 >197107300744000 197107300822480 >197107300828540 197107301157300 >197107301203360 197107301521360 >197107301527420 197107301539540 >197107301548060 197107301628480 >197107301639000 197107301705360 >197107301711420 197107301930000 >197107301942180 197107302004540 >197107302010000 197107302125240 >197107302131000 197107302135060 >197107302141120 197107310014540 >197107310021060 197107310035240 >197107310041360 197107310133060 >197107310139120 197107310151300 >197107310158120 197107310321540 >197107310328060 197107310810120 >197107310818240 197107310818240 >197107310824300 197107310853060 >197107310901180 197107310932000 >197107310938000 197107311242300 >197107311250360 197107311300540 >197107311307000 197107311311060 >197107311317120 197107311337360 >197107311343480 197107311652000 >197107311658120 197107311815540 >197107311840420 197107311840420 >197107311851180 197107311851180 >197108010658360 197108010719060 >197108010725060 197108010727000 >197108010733000 197108010911420 >197108010917120 197108010919120 >197108010925120 197108011244540 >197108011250540 197108011445060 >197108011451060 197108011721180 >197108011727180 197108011833300 >197108011839300 197108012225420 >197108012231420 197108020518240 >197108020524240 197108020618060 >197108020624060 197108021048060 >197108021054000 197108021159180 >197108021205180 197108021421420 >197108021431360 197108021453180 >197108021459120 197108021546360 >197108021554300 197108021639540 >197108021645480 197108021814300 >197108021905060 197108031042240 >197108031048120 197108031304300 >197108031310240 197108031331480 >197108031339360 197108031339360 >197108031345240 197108031523120 >197108031531000 197108031908480 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (u-3-71-cb.325_050) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197107172000000 197107182200000 >197107182225000 197107200400000 >197107200420000 197107212220000 >197107212231000 197107212310000 >197107212321000 197107220838000 >197107222302000 197107240744000 >197107241952000 197107251330000 >197107251350000 197107260530000 >197107260541000 197107261700000 >197107262007000 197107271150000 >197107271201000 197107272240000 >197107272257000 197107280000000 >197107280101000 197107280220000 >197107280231000 197107281350000 >197107281401000 197107281430000 >197107281450000 197107281500000 >197107281530000 197107282100000 >197107282120000 197107290210000 >197107290240000 197107291600000 >197107291730000 197107300459000 >197107300510000 197107300510000 >197107300521000 197107300521000 >197107300638000 197107301520000 >197107301600000 197107302130000 >197107302150000 197107302310000 >197107302338000 197107310430000 >197107310801000 197107311120000 >197107311145000 197108010050000 >197108010104000 197108010540000 >197108010600000 197108010720000 >197108010734000 197108011730000 >197108011830000 197108012150000 >197108012210000 197108021600000 >197108021630000 197108021800000 >197108021900000 197108022330000 >197108022350000 197108030020000 >197108030031000 197108030320000 >197108030335000 197108030820000 >197108030831000 197108030844000 >197108030908000 197108030908000 >197108030920000 197108040320000 >197108040332000 197108040600000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST Unspecified Unspecified >Converted to time format with year at start. >02/11/86 KAYE DUA0:[DATA.U371CB.N]U371CB.050; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 19951215 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 >10/31/1998 /tiger/u/u371cb/grav/u-3-71-cb.160_050 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >03/07/86 BARB DUA0:[DATA.U371CB]U371CB.160 >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >Input was... >Converted to time format with year at start. > >02/11/86 KAYE DUA0:[DATA.U371CB.N]U371CB.050; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >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 u-3-71-cb.220_050 > >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/u/u371cb/mag/u-3-71-cb.200_050 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >03/10/86 CAROLYN DRS$DATA:[U371CB.M]U371CB.200; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 >was U371CB.220 on 71BKUP > >03/22/85 CAROLYN USR$DISK:[DRS.DATA.U3.M]U371CB.220; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 > >Converted to time format with year at start. > >02/11/86 KAYE DUA0:[DATA.U371CB.N]U371CB.050; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >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/u/u371cb/bath/u-3-71-cb.325_050 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >03/07/86 BECKIE DUA0:[DATA.U371CB]U371CB.325; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >Input was... >Converted to time format with year at start. > >02/11/86 KAYE DUA0:[DATA.U371CB.N]U371CB.050; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >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. 1988 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 Eastern Greater Antilles, Caribbean Point Point 0.000001 0.000001 Decimal degrees D_WGS_1984 WGS_1984 6378137.000000 298.25722210100002 u371cb.m77t MGD77T single-beam bathymetry, gravity, and magnetics data file for U371CB 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 19710717 19710804 Year, month, day TIME Time NGDC 0 2359 hours and decimal minutes LAT Latitude World Geodetic System 1984 Geographic Coordinate System 15.37500 30.28710 decimal degrees LON Longitude World Geodetic System 1984 Geographic Coordinate System -68.99670 -58.58530 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 0.04 10.22 seconds CORR_DEPTH Bathymetry, corrected depth U.S. Geological Survey 31 7738 decimal meters BAT_CPCO Bathymetric Correction code - details the procedure used for determining the sound velocity correction to depth NGDC 59 59 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 39945.6 43941 gammas MAG_RES Magnetics residual field field NGDC -524.2 1579.8 gammas GRA_OBS Observed gravity NGDC 977368.3 984662.6 gammas EOTVOS EOTVOS correction - E = 7.5 V cos(phi) * sin(alpha) + 0.0042 V*V NGDC -75.3 297.8 gammas FREEAIR Free-air Anomaly = G(observed) minus G(theoretical) NGDC -451.9 948.6 milligals Bathymetry, gravity, magnetic and navigation data for U.S. Geological Survey bathymetry survey U371CB 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. 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. 2.3 http://www.ngdc.noaa.gov/mgg/trk/trackline/united_geo_i/u371cb/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