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

Metadata also available as - [Outline] - [Parseable text] - [XML]

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 USGS field activities from which some of these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=B199SC
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.
  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?
    smig1m.tif
    Raster containing backscatter values (Source: Producer defined)
    Band_1
    raster wavelength band containing backscatter values (Source: ESRI)
    Range of values
    Minimum:0
    Maximum:255
    Units:none
    Entity_and_Attribute_Overview: Backscatter surface showing degrees of seafloor roughness
    Entity_and_Attribute_Detail_Citation:
    The entity and attribute information was generated by the individual and/or agency identified as the originator of the data set. Please review the rest of the metadata record for additional details and information.

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?
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Attn: PCMSC Science Data Coordinator
    2885 Mission Street
    Santa Cruz, CA
    USA

    831-427-4747 (voice)
    pcmsc_data@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 19)
    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 19)
    navmerge FILES> /work1/gregg/b1-99-sc/L3,/work1/gregg/b1-99-sc/b199sc PARAMS> LATLON
    Date: 06-Dec-2000 (process 3 of 19)
    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 19)
    navflt FILES> /work1/gregg/b1-99-sc/L3_snr PARAMS> NR=9,ALTITUDE
    Date: 06-Dec-2000 (process 5 of 19)
    navflt FILES> /work1/gregg/b1-99-sc/L3_snr PARAMS> NR=101,HEADING
    Date: 06-Dec-2000 (process 6 of 19)
    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 19)
    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 19)
    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 19)
    deltav FILES> /work1/gregg/b1-99-sc/L3_dv=/work1/gregg/b1-99-sc/L3_pr PARAMS> PIXRES=0.1
    Date: 17-Jan-2001 (process 10 of 19)
    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 19)
    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 19)
    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 19)
    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 19)
    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 19)
    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 19)
    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 19)
    scale FILES> /work1/guy/mig/smi1m=/work1/guy/mig/smi_mos PARAMS> NL=6865,NS=15564
    Date: 19-Oct-2020 (process 18 of 19)
    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
    Date: 20-Oct-2021 (process 19 of 19)
    Edited metadata to add USGS Thesaurus keywords and perform minor edits to bring the metadata up to current PCMSC standards. No data were changed. The metadata available from a harvester may supersede metadata bundled within a download file. Users are advised to compare the metadata dates to determine which metadata file is most recent. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Susan Cochran
    Geologist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7545 (voice)
    scochran@usgs.gov
  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?
    Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: A zip archive containing the GeoTIFF image, associated world file, and metadata. in format TIFF GeoTIFF Size: 36
      Network links: https://doi.org/10.3133/ofr0385
    • Cost to order the data: None

  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: 20-Oct-2021
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: PCMSC Science Data Coordinator
2885 Mission Street
Santa Cruz, CA
USA

831-427-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/SeriesReports/OFR/OFR_03-085/smig1m.tif.faq.html>
Generated by mp version 2.9.50 on Thu Oct 21 09:29:12 2021