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What does this data set describe?

Title:
Geophysical data of field activity L-2-75-NP in Gulf of Alaska from 08/25/1975 to 09/04/1975
Abstract:
Chief Scientist: Dave Scholl. Geophysical data (gravity, 3dot5khz, airgun, Burgairgun, gradiometer, dopplersonar, integratednavigation, transitsatellite, Burgsparker) of field activity L-2-75-NP in Gulf of Alaska from 08/25/1975 to 09/04/1975, <http://walrus.wr.usgs.gov/infobank/l/l275np/html/l-2-75-np.meta.html>.
Supplemental_Information:

Equipment Used -
gravity
3dot5khz 3.5 khz bathymetry
airgun single-channel airgun
Burgairgun
gradiometer
dopplersonar
integratednavigation
transitsatellite
Burgsparker

Similar information is available for thousands of other USGS/CMG-related Activities.
If known, available are Activity-specific navigation, gravity, magnetics, bathymetry, seismic, and sampling data; track maps; and equipment information; as well as summary overviews, crew lists, and information about analog materials.
If available, access to physical samples is described in the "WR CMG Sample Distribution Policy" at: <http://walrus.wr.usgs.gov/infobank/programs/html/main/sample-dist-policy.html>
Primary access to the USGS/CMG Information Bank's digital data, analog data, and metadata is provided through... <http://walrus.wr.usgs.gov/infobank/>
This page accomodates a variety of search approaches (e.g., by platform, by region, by scientist, by equipment type, etc.).
  1. How should this data set be cited?

    U.S. Geological Survey (USGS) <http://www.usgs.gov/>, Coastal and Marine Geology Program (CMGP) <http://marine.usgs.gov/>, 20131029, Geophysical data of field activity L-2-75-NP in Gulf of Alaska from 08/25/1975 to 09/04/1975: U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>, Menlo Park, CA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -166.49365
    East_Bounding_Coordinate: -122.66299
    North_Bounding_Coordinate: 54.63333
    South_Bounding_Coordinate: 37.77899

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 25-Aug-1975
    Ending_Date: 04-Sep-1975
    Currentness_Reference: ground condition

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

  6. How does the data set represent geographic features?

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

      Indirect_Spatial_Reference: Gulf of Alaska
      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 0.00001. Longitudes are given to the nearest 0.00001. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.

      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: Local surface
      Depth_Resolution: 0.1
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Attribute values


  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    Bathymetry with Time Stamp <http://walrus.wr.usgs.gov/infobank/programs/html/definition/bath.html>
    Entity_and_Attribute_Overview:
    Magnetics with Time Stamp <http://walrus.wr.usgs.gov/infobank/programs/html/definition/mag.html>
    Entity_and_Attribute_Overview:
    Navigation with Time Stamp <http://walrus.wr.usgs.gov/infobank/programs/html/definition/nav.html>


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    Byron Ruppel (Geophysicist); Dave Scholl (Chief Scientist); Don Tompkins (Geophysicist); Graig McHendrie (Geophysicist); John Howell (Geophysicist); Keith Wilson (Geophysicist); Pamela Smith (Dafe Curator); Tom Atkins (Watchstander)

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

    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>
    Attn: Clint Steele <http://walrus.wr.usgs.gov/staff/csteele.html>
    InfoBank Group Leader <http://walrus.wr.usgs.gov/staff/csteele.html>
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov <mailto:infobank@octopus.wr.usgs.gov>


Why was the data set created?

These data and information are intended for science researchers, students from elementary through college, policy makers, and general public.


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: 19-Jan-1996 (process 1 of 3)
    Navigation Data
    Converted to time format with year at start.
    
    02/11/86 KAYE DUA0:[DATA.L275NP.N]L275NP.051;
    DRB0:[DRS.REFMT]REFORMAT.EXE;5
    
    

    Person who carried out this activity:

    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>
    Attn: Clint Steele <http://walrus.wr.usgs.gov/staff/csteele.html>
    InfoBank Group Leader <http://walrus.wr.usgs.gov/staff/csteele.html>
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov <mailto:infobank@octopus.wr.usgs.gov>

    Date: 20-Jun-2012 (process 2 of 3)
    Magnetics Data
    06/20/2012 carolyn l-2-75-np.220_051
    
    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/l275np/mag/l-2-75-np.200_051
    /bear/programs/edit/automerge/automerge
    
    Converted to time format with year at start.
    
    02/14/86 CAROLYN DRS$DATA:[L275NP.M]L275NP.200;
    DRB0:[DRS.REFMT]REFORMAT.EXE;5
    was L275NP._.MAGSX1 on TAM157
    was L275NP201.DAT   on VAM157
    
    Converted to time format with year at start.
    
    02/11/86 KAYE DUA0:[DATA.L275NP.N]L275NP.051;
    DRB0:[DRS.REFMT]REFORMAT.EXE;5
    
    time, lat, long, time(sec) to nearest nav fix, data values
    

    Person who carried out this activity:

    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>
    Attn: Clint Steele <http://walrus.wr.usgs.gov/staff/csteele.html>
    InfoBank Group Leader <http://walrus.wr.usgs.gov/staff/csteele.html>
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov <mailto:infobank@octopus.wr.usgs.gov>

    Date: 31-Oct-1998 (process 3 of 3)
    Bathymetry Data
    10/31/1998  /tiger/l/l275np/bath/l-2-75-np.335_051
    /bear/programs/edit/automerge/automerge
    
    Input was...
    Converted to time format with year at start.
    
    02/14/86 BECKIE DISK$USERDISK:[CLINT.BECKIE]L275NP.335;
    DRB0:[DRS.BAT]BATRED.EXE;1
    This file was hand-digetized in 2-way traveltime(secs).
    It was reduced with no Matthews correction and the
    velocity of sound assumed was 1500m/sec.
    
    02/14/86 BECKIE DISK$USERDISK:[CLINT.BECKIE]L275NP.310;
    DRB0:[DRS.REFMT]REFORMAT.EXE;5
    
    Input was...
    Converted to time format with year at start.
    
    02/11/86 KAYE DUA0:[DATA.L275NP.N]L275NP.051;
    DRB0:[DRS.REFMT]REFORMAT.EXE;5
    
    time, lat, long, time(sec) to nearest nav fix, data values
    

    Person who carried out this activity:

    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>
    Attn: Clint Steele <http://walrus.wr.usgs.gov/staff/csteele.html>
    InfoBank Group Leader <http://walrus.wr.usgs.gov/staff/csteele.html>
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov <mailto:infobank@octopus.wr.usgs.gov>

  3. What similar or related data should the user be aware of?

    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>, Unknown, USGS/CMG Information Bank <http://walrus.wr.usgs.gov/infobank/>: U.S. Geological Survey (USGS) <http://www.usgs.gov> Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>, Menlo Park, CA.

    Online Links:


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

  1. How well have the observations been checked?

    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-2-75-np.051 [SINS])
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    197508252252000    197508301518000
    197508301606000    197508301708000
    197508301754000    197508301918000
    197508302002000    197508310031000
    197508310134000    197508310500000
    197508310546000    197508310546000
    197508310730000    197508310730000
    197508310814000    197508310918000
    197508311108000    197508311601000
    197508311720000    197508311812000
    197508311938000    197508312318000
    197509010001000    197509010001000
    197509010102000    197509010102000
    197509010301000    197509010424000
    197509010532000    197509010738000
    197509010828000    197509011028000
    197509011112000    197509011535000
    197509011618000    197509011702000
    197509011744000    197509011814000
    197509011856000    197509011918000
    197509012008000    197509012048000
    197509012130000    197509012300000
    197509020003000    197509020526000
    197509020612000    197509020632000
    197509020716000    197509020716000
    197509020808000    197509020828000
    197509020910000    197509020936000
    197509021020000    197509021631000
    197509021716000    197509021816000
    197509021900000    197509022000000
    197509022112000    197509022132000
    197509022214000    197509022214000
    197509022300000    197509022300000
    197509022342000    197509030030000
    197509030129000    197509030400000
    197509030446000    197509030502000
    197509030556000    197509030804000
    197509030852000    197509031016000
    197509031100000    197509031206000
    197509031252000    197509031500000
    197509031607000    197509031607000
    197509031700000    197509040200000
    197509040302000    197509040401000
    197509040500000    197509040531000
    197509040618000    197509040746000
    197509040832000    197509040938000
    197509041020000    197509041334000
    197509041431000    197509041500000
    197509041600000    197509041600000
    197509041702000    197509041958000
    197509042050000    197509042150000
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    Magnetics Data (l-2-75-np.220_051)
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    197508252255320    197508270253040
    197508270258530    197508271629350
    197508271635350    197508280200350
    197508280234410    197508280626470
    197508280632140    197508291855480
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    Bathymetry Data (l-2-75-np.335_051)
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    197509022301060    197509022301060
    197509022327360    197509022327360
    197509022353000    197509022353000
    197509030018300    197509030018300
    197509030053240    197509030053240
    197509030121480    197509030121480
    197509030152420    197509030152420
    197509030221240    197509030221240
    197509030247300    197509030247300
    197509030316180    197509030316180
    197509030344060    197509030344060
    197509030412300    197509030412300
    197509030439420    197509030439420
    197509030508420    197509030508420
    197509030541480    197509030541480
    197509030608420    197509030608420
    197509030639300    197509030639300
    197509030707000    197509030707000
    197509030738240    197509030738240
    197509030804480    197509030804480
    197509030837360    197509030837360
    197509030905480    197509030905480
    197509030934300    197509030934300
    197509031017000    197509031017000
    197509031059120    197509031059120
    197509031131300    197509031131300
    197509031203180    197509031203180
    197509031233120    197509031233120
    197509031302060    197509031302060
    197509031327540    197509031327540
    197509031405480    197509031405480
    197509031431540    197509031431540
    197509031457540    197509031457540
    197509031525480    197509031525480
    197509031555060    197509031555060
    197509031622120    197509031622120
    197509031648180    197509031648180
    197509031724060    197509031724060
    197509031750120    197509031750120
    197509031824300    197509031824300
    197509031857240    197509031857240
    197509031924240    197509031924240
    197509032018480    197509032018480
    197509032055240    197509032055240
    197509032125000    197509032125000
    197509032150360    197509032150360
    197509032221000    197509032221000
    197509032247060    197509032247060
    197509032312240    197509032312240
    197509032337420    197509032337420
    197509040002420    197509040002420
    197509040030000    197509040030000
    197509040056540    197509040056540
    197509040123540    197509040123540
    197509040149540    197509040149540
    197509040628540    197509040628540
    197509040656180    197509040656180
    197509040723060    197509040723060
    197509040751420    197509040751420
    197509040823060    197509040823060
    197509040852060    197509040852060
    197509040918300    197509040918300
    197509041000060    197509041000060
    197509041026360    197509041026360
    197509041053420    197509041053420
    197509041119120    197509041119120
    197509041211180    197509041211180
    197509041236240    197509041236240
    197509041303240    197509041303240
    197509041332480    197509041332480
    197509041400060    197509041400060
    197509041427420    197509041427420
    197509041455300    197509041455300
    197509041548540    197509041548540
    197509041625180    197509041625180
    197509041705060    197509041705060
    197509041745000    197509041745000
    197509041810000    197509041810000
    197509041837240    197509041837240
    197509041903180    197509041903180
    197509041928300    197509041928300
    197509041953360    197509041953360
    197509042020120    197509042020120
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    

  5. How consistent are the relationships among the observations, including topology?

    Unspecified


How can someone get a copy of the data set?

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

Access_Constraints:
Physical materials are under controlled on-site access.
If available, access to physical samples is described in the "WR CMG Sample Distribution Policy" at: <http://walrus.wr.usgs.gov/infobank/programs/html/main/sample-dist-policy.html>
Use_Constraints:
Please recognize the U.S. Geological Survey (USGS) as the source of this information.
Physical materials are under controlled on-site access.
Some USGS information accessed through this means may be preliminary in nature and presented without the approval of the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the responsibility of the user.
This information is not intended for navigational purposes.
Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

  1. Who distributes the data set? (Distributor 1 of 1)

    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>
    Attn: Clint Steele <http://walrus.wr.usgs.gov/staff/csteele.html>
    InfoBank Group Leader <http://walrus.wr.usgs.gov/staff/csteele.html>
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov <mailto:infobank@octopus.wr.usgs.gov>

  2. What's the catalog number I need to order this data set?

    Downloadable Data L-2-75-NP data set <http://walrus.wr.usgs.gov/infobank/l/l275np/html/l-2-75-np.meta.html>

  3. What legal disclaimers am I supposed to read?

    Please recognize the U.S. Geological Survey (USGS) as the source of this information.
    Physical materials are under controlled on-site access.
    Some USGS information accessed through this means may be preliminary in nature and presented without the approval of the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the responsibility of the user.
    This information is not intended for navigational purposes.
    Any use of trade, firm, or product 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: ASCII Size: 0.0
Network links: <http://walrus.wr.usgs.gov/infobank/l/l275np/html/l-2-75-np.nav.html>

Data format: ASCII Size: 0.1
Network links: <http://walrus.wr.usgs.gov/infobank/l/l275np/html/l-2-75-np.mag.html>

Data format: ASCII Size: 0.1
Network links: <http://walrus.wr.usgs.gov/infobank/l/l275np/html/l-2-75-np.bath.html>

  • Cost to order the data: None


  • Who wrote the metadata?

    Dates:
    Last modified: 29-Oct-2013
    Metadata author:
    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>
    Attn: Clint Steele <http://walrus.wr.usgs.gov/staff/csteele.html>
    InfoBank Group Leader <http://walrus.wr.usgs.gov/staff/csteele.html>
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov <mailto:infobank@octopus.wr.usgs.gov>

    Metadata standard:
    FGDC Content Standards for Digital Geospatial Metadata <http://www.fgdc.gov/> (FGDC-STD-001-1998 <http://www.its.nbs.gov/nbs/meta/meta.html>)


    Generated by mp version 2.9.13 on Tue Oct 29 12:50:48 2013