SMIG1M.TIF - Sidescan sonar image of South San Miguel Island (UTM 10N, NAD83)

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Frequently anticipated questions:


What does this data set describe?

Title:
SMIG1M.TIF - Sidescan sonar image of South San Miguel Island (UTM 10N, NAD83)
Abstract:
The sidescan sonar image of the nearshore seafloor (0 to 100 m water depths) of the Big Sycamore reserve area was mosaicked from data collected in 1998. A Klein 2000 sidescan system was used for geophysical surveying. A Triton Elics Isis brand side-scan data recording system was used on the cruise. The 1998 survey was navigated with a Leica Differential Global Positioning System (DGPS) which provided a ship position with accuracy of 1-5 m in DGPS mode. At times during the cruise differential signal was interrupted. In non-differential mode, the receiver provided a position with 30-50 m accuracy. A KVH Industries Inc. azimuth digital gyro-compass provided ship headings with 0.5 degree accuracy. Navigation data were recorded using Yo-Nav version 1.19 (Gann, 1992). The sidescan fish was towed approximately 30 m above the seafloor. The distance of the fish behind the ship was not known during this survey and must be estimated when the data are processed in order to produce the sidescan image mosaics. The resolution of the processed data mosaics is 0.2 m. The data are presented here at a resolution of 1 m. This is one of a collection of digital files of a geographic information system of spatially referenced data related to the USGS Coastal and Marine Geology Program Nearshore Benthic Habitat Mapping Project. See <http://walrus.wr.usgs.gov/nearshorehab> for more information.
Supplemental_Information:
Additional information about the field activities from which this data set was derived are available online at http://walrus.wr.usgs.gov/infobank/b/b199sc/html/b-1-99-sc.meta.html
  1. How might this data set be cited?
    Cochrane, Guy R., and Gabel, Greg S., 2002, SMIG1M.TIF - Sidescan sonar image of South San Miguel Island (UTM 10N, NAD83): Open-File Report 03-085, U.S. Geological Survey, Coastal and Marine Geology Program, Western Coastal and Marine Geology, Menlo Park, CA.

    Online Links:

    This is part of the following larger work.

    Cochrane, Guy R., Nasby, Nicole, Reid, Jane A., Waltenberger, Ben, and Lee, Kristen, 2003, Nearshore Benthic Habitat GIS for the Channel Islands National Marine Sanctuary and Southern California State Fisheries Reserves, Volume 1: Open-File Report 03-085, U.S. Geological Survey, Coastal and Marine Geology Program, Western Coastal and Marine Geology, Menlo Park, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -120.29167
    East_Bounding_Coordinate: -120.45833
    North_Bounding_Coordinate: 34.025
    South_Bounding_Coordinate: 33.96667
  3. What does it look like?
    http://coastalmap.marine.usgs.gov/metadata/westcoast/socal/cinms/smig1m-thumb.gif (GIF)
    Thumbnail image showing the South San Miguel Island sidescan sonar mosaic.
    http://coastalmap.marine.usgs.gov/metadata/westcoast/socal/cinms/smig1m.gif (GIF)
    Overview image showing the South San Miguel Island sidescan sonar mosaic.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 01-Mar-1999
    Ending_Date: 11-Mar-1999
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: remote-sensing image
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Raster data set. It contains the following raster data types:
      • Dimensions 6865 x 15564 x 1, type Pixel
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 10
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -123.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000
      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 0.999987
      Ordinates (y-coordinates) are specified to the nearest 0.999987
      Planar coordinates are specified in meters
      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.
  7. How does the data set describe geographic features?
    Band_1
    ObjectID
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    Value
    Red
    Green
    Blue

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Guy R. Cochrane
    • Greg S. Gabel
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Guy R. Cochrane
    U.S. Geological Survey
    Geophysicist
    345 Middlefield Road, Mail Stop 999
    Menlo Park, CA
    USA

    (650) 329-5076 (voice)
    (650) 329-5190 (FAX)
    gcochrane@usgs.gov

Why was the data set created?

These data are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) software to display geologic and oceanographic information about the shallower areas of S. California coast.

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: 15-Nov-2000 (process 1 of 17)
    xtfin FILES> /work1/gregg/b1-99-sc/L3=/work1/gregg/b1-99-sc/Mig3.XTF PARAMS> LCHAN=2,RCHAN=1 PARAMS> RATE2
    Date: 05-Dec-2000 (process 2 of 17)
    navmerge FILES> /work1/gregg/b1-99-sc/L3,/work1/gregg/b1-99-sc/b199sc PARAMS> LATLON
    Date: 06-Dec-2000 (process 3 of 17)
    snrshade FILES> /work1/gregg/b1-99-sc/L3_snr=/work1/gregg/b1-99-sc/L3 PARAMS> MIN=1,MAX=254
    Date: 06-Dec-2000 (process 4 of 17)
    navflt FILES> /work1/gregg/b1-99-sc/L3_snr PARAMS> NR=9,ALTITUDE
    Date: 06-Dec-2000 (process 5 of 17)
    navflt FILES> /work1/gregg/b1-99-sc/L3_snr PARAMS> NR=101,HEADING
    Date: 06-Dec-2000 (process 6 of 17)
    slr2gr FILES> /work1/gregg/b1-99-sc/L3_snr_sg=/work1/gregg/b1-99-sc/L3_snr PARAMS> PIXRES=0.1,NANGLE=90,FANGLE=0.5,LOFFSET=0,ROFFSET=0
    Date: 06-Dec-2000 (process 7 of 17)
    shade FILES> /work1/gregg/b1-99-sc/L3_snr_sg_sh=/work1/gregg/b1-99-sc/L3_snr_sg PARAMS> MULT,MIN=1,MAX=254,SL=1,EL=8000
    Date: 06-Dec-2000 (process 8 of 17)
    destripe FILES> /work1/gregg/b1-99-sc/L3_snr_sg_sh_ds2=/work1/gregg/b1-99-sc/L3_snr_sg_sh PARAMS> LNL=501,LNS=501,LLOW=1,LHIGH=254,HNL=501,HNS=31,HLOW=1,HHIGH=254
    Date: 06-Dec-2000 (process 9 of 17)
    deltav FILES> /work1/gregg/b1-99-sc/L3_dv=/work1/gregg/b1-99-sc/L3_pr PARAMS> PIXRES=0.1
    Date: 11-Oct-20007 (process 10 of 17)
    snrgeom FILES> /work1/gregg/b1-99-sc/L3_gm=/work1/gregg/b1-99-sc/L3_dv PARAMS> UTM PARAMS> WGS84 PARAMS> ZONE=10,SCALE=0.9996 PARAMS> SLAT=33.96667,SLON=-120.45833,ELAT=34.025,ELON=-120.29167,ROTATION=0,PIX RES=0.2
    Date: 17-Jan-2001 (process 11 of 17)
    digmos FILES> /work1/gregg/b1-99-sc/L3_mos=/work1/gregg/b1-99-sc/L3_gm PARAMS> PROJECTION PARAMS> SLAT=33.96667,SLON=-120.45833,ELAT=34.025,ELON=-120.29167
    Date: 18-Jan-2001 (process 12 of 17)
    digmos FILES> /work1/gregg/b1-99-sc/L3_moz=/work1/gregg/b1-99-sc/L3_mos PARAMS> MANUAL PARAMS> ONL=34325,ONS=77818 PARAMS> ISL=1,ISS=1,IEL=34325,IES=77818,OSL=20,OSS=180
    Date: 18-Jan-2001 (process 13 of 17)
    maskim FILES> /work1/gregg/b1-99-sc/L3_msk=/work1/gregg/b1-99-sc/L3_moz,/work1/gregg/b1-99-sc/L3_ras PARAMS>
    Date: 18-Jan-2001 (process 14 of 17)
    digmos FILES> /work1/gregg/b1-99-sc/b1-99-sc_mos=/work1/gregg/b1-99-sc/L3_msk PARAMS> ISL=1,ISS=1,IEL=34325,IES=77818,OSL=1,OSS=1 PARAMS> INPUT
    Date: 18-Jan-2001 (process 15 of 17)
    digmos FILES> /work1/gregg/b1-99-sc/b1-99-sc_mos2=/work1/gregg/b1-99-sc/b1-99-sc_mos PARAMS> MANUAL PARAMS> ONL=34325,ONS=77818 PARAMS> ISL=15,ISS=100,IEL=34325,IES=77818,OSL=1,OSS=1
    Date: 18-Jan-2001 (process 16 of 17)
    filter FILES> /work1/gregg/b1-99-sc/b1-99-sc_mosf=/work1/gregg/b1-99-sc/b1-99-sc_mos2 PARAMS> LPFZ PARAMS> NL=3,NS=3,LOW=1,HIGH=255,PERCENT=0,MULT=1
    Date: 18-Jan-2001 (process 17 of 17)
    scale FILES> /work1/guy/mig/smi1m=/work1/guy/mig/smi_mos PARAMS> NL=6865,NS=15564
  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?
    Accuracy Unknown
  2. How accurate are the geographic locations?
    On the order of 10 meters.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Completeness unknown
  5. How consistent are the relationships among the observations, including topology?
    Logical Consistency untested.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None
Use_Constraints:
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.
These data are not to be used for navigation purposes.
  1. Who distributes the data set? (Distributor 1 of 1)
    Guy R. Cochrane
    U.S. Geological Survey
    Geophysicist
    345 Middlefield Road, Mail Stop 999
    Menlo Park, CA
    USA

    (650) 329-5076 (voice)
    (650) 329-5190 (FAX)
    gcochrane@usgs.gov
  2. What's the catalog number I need to order this data set? Downloadable Data
  3. What legal disclaimers am I supposed to read?
    Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data.
    The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials.
    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?
  5. What hardware or software do I need in order to use the data set?
    This image is available as a GeoTIFF image with an accompanying world file. To utilize this data, the user must have an image viewer, image processing or GIS software package capable of importing a GeoTIFF image.

Who wrote the metadata?

Dates:
Last modified: 08-Jun-2006
Last Reviewed: 15-Aug-2003
Metadata author:
Guy R. Cochrane
U.S. Geological Survey
Geophysicist
345 Middlefield Road, Mail Stop 999
Menlo Park, CA
USA

(650) 329-5076 (voice)
(650) 329-5190 (FAX)
gcochrane@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/westcoast/socal/cinms/smig1m.tif.faq.html>
Generated by mp version 2.9.49 on Fri Sep 13 15:01:16 2019