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/samuel_p._lee/l485wf/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 and magnetics data along with DGPS navigation data was collected as part of field activity L-4-85-WF in Juan de Fuca from 07/28/1985 to 08/08/1985, http://walrus.wr.usgs.gov/infobank/l/l485wf/html/l-4-85-wf.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/l485wf/html/l-4-85-wf.bath.html http://walrus.wr.usgs.gov/infobank/l/l485wf/html/l-4-85-wf.bath.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. 19850728 19850808 ground condition Complete None planned -130.57957 -124.18956 44.87353 38.52562 USGS Metadata Identifier USGS:2420e6c5-e86a-46e3-b9ed-70eaea84b77a ISO 19115 Topic Category geoscientificinformation oceans None Marine Geology Marine Geophysics 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 magnetic field observations marine geophysics USGS Thesaurus single-beam echo sounder bathymetry measurement bathymetry magnetometer measurement marine geophysics Geographic Names Information System (GNIS) CA Juan de Fuca Juan de Fuca Ridge North Pacific Ocean Northern California Northern Pacific Ocean OR Oregon Pacific Northwest EEZ 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 Bill Normark (Chief Scientist) 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 (l-4-85-wf.071) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198507281829000 198508081803000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (l-4-85-wf.220_071) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198508030059320 198508030059360 >198508030523280 198508030523400 >198508030534400 198508030916320 >198508030940560 198508031320000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-4-85-wf.330_071) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198507281926430 198507282025000 >198507282035000 198507282131000 >198507282200000 198507282242000 >198507282306000 198507282306000 >198507290042000 198507290042000 >198507290609000 198507290609000 >198507290615000 198507290615000 >198507290625000 198507290641000 >198507290820000 198507290820000 >198507290847000 198507290847000 >198507290911000 198507290911000 >198507290948000 198507290948000 >198507290957000 198507290957000 >198507291104000 198507291104000 >198507291115000 198507291115000 >198507291121000 198507291121000 >198507291128000 198507291139000 >198507291340000 198507291342000 >198507291436000 198507291436000 >198507291538000 198507291538000 >198507291547000 198507291551000 >198507291637000 198507291637000 >198507291648000 198507291648000 >198507291654000 198507291654000 >198507291703000 198507291703000 >198507291709000 198507291709000 >198507291730000 198507291737000 >198507291753000 198507291753000 >198507291808000 198507291811000 >198507291818000 198507291823000 >198507291944000 198507291944000 >198507292018000 198507292022000 >198507312256000 198508061817000 >198508061823000 198508061831000 >198508061842000 198508062207000 >198508062220000 198508070108000 >198508070128000 198508070201000 >198508070303000 198508070303000 >198508070309000 198508070309000 >198508070316000 198508070325000 >198508070332000 198508070337000 >198508070343000 198508070343000 >198508070404000 198508070404000 >198508070434000 198508070439000 >198508070459000 198508070459000 >198508070516000 198508070530000 >198508070543000 198508070543000 >198508070644000 198508070703000 >198508070712000 198508070719000 >198508070728000 198508070728000 >198508070916000 198508070916000 >198508071229000 198508071229000 >198508071433000 198508071437000 >198508071649000 198508071649000 >198508071807000 198508071807000 >198508071820000 198508071820000 >198508071826000 198508071828000 >198508071918000 198508071918000 >198508080138000 198508080138000 >198508080600000 198508080615000 >198508080650000 198508080703000 >198508080827000 198508080831000 >198508081133000 198508081138000 >198508081153000 198508081153000 >198508081223000 198508081223000 >198508081229000 198508081229000 >198508081532000 198508081532000 >198508081538000 198508081538000 >198508081558000 198508081558000 >198508081604000 198508081604000 >198508081632000 198508081634000 >198508081646000 198508081646000 >198508081743000 198508081743000 >198508081757000 198508081757000 >198508081803000 198508081803000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST Unspecified Unspecified Navigation Data >Converted to time format with year at start. > >12/18/85 KAYE DUA0:[DATA.L485WF.N]L485WF.071; >DRB0:[DRS.NAV]EOTCSSP.EXE; > 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 Magnetics Data >06/20/2012 carolyn l-4-85-wf.220_071 > >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/l485wf/mag/l-4-85-wf.200_071 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >12/06/85 CAROLYN DRS$DATA:[L485WF.M]L485WF.200; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >08/21/85 EDM DRS$DATA:[L485WF.M]L45MA1.200; >DRB0:[DRS.MAG]REFMTMAG.EXE; > >Converted to time format with year at start. > >12/18/85 KAYE DUA0:[DATA.L485WF.N]L485WF.071; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >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/l485wf/bath/l-4-85-wf.330_071 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >08/18/88 JEAN DUA0:[DRS.CDI.NORMARK]L485WF.330; >DUA0:[DRS.BAT]BATRED.EXE;2 >Edited bathymetry data > >09/06/85 BECKIE DUA0:[DATA.L485WF.B]L485WF.301; >DRB0:[DRS.DSMPL]DESAMTIME.EXE;1 >This file is 2 min. digitrack bathy. > >Input was... >Converted to time format with year at start. > >12/18/85 KAYE DUA0:[DATA.L485WF.N]L485WF.071; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >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 Juan de Fuca Point Point 0.000001 0.000001 Decimal degrees D_WGS_1984 WGS_1984 6378137.000000 298.25722210100002 l485wf.m77t MGD77T single-beam bathymetry and magnetics data file for L485WF 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 19850728 19850808 Year, month, day TIME Time NGDC 0 2359 hours and decimal minutes LAT Latitude World Geodetic System 1984 Geographic Coordinate System 38.52562 44.87353 decimal degrees LON Longitude World Geodetic System 1984 Geographic Coordinate System -130.57957 -124.18956 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 0.0883 5.1139 seconds CORR_DEPTH Bathymetry, corrected depth U.S. Geological Survey 66.2 3819.3 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 49641 53207 gammas MAG_RES Magnetics residual field field NGDC -127.9 378.1 gammas Bathymetry, magnetics, and navigation data for U.S. Geological Survey bathymetry survey L485WF in MGD77T format. Attributes are obtained from MGD77T data files created from the navigation, magnetics, 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. .867 http://www.ngdc.noaa.gov/mgg/trk/trackline/samuel_p._lee/l485wf/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