sanap1m.tif - Sidesan sonar image of South Anacapa Passage sidesan sonar backscatter image in nearshore Benthic Habitat mappping Project S. California map Series.

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Frequently-anticipated questions:

What does this data set describe?

Title:
sanap1m.tif - Sidesan sonar image of South Anacapa Passage sidesan sonar backscatter image in nearshore Benthic Habitat mappping Project S. California map Series.
Abstract:
The sidescan sonar image of the nearshore seafloor (0 to 100 m water depths) of the southern Anacapa Passage area was mosaicked from data collected in 1999 and 2000. 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 2000 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 (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. The sidescan data were processed using USGS MIPS sonar processing software (Chavez, 1984). See <http://walrus.wr.usgs.gov/nearshorehab> for more information about this data set.

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/m/m100sc/html/m-1-00-sc.meta.html>

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 should this data set be cited?

    Cochrane, Guy R. , 2005, sanap1m.tif - Sidesan sonar image of South Anacapa Passage sidesan sonar backscatter image in nearshore Benthic Habitat mappping Project S. California map Series.:.

    Online Links:

    This is part of the following larger work.

    Cochrane, Guy R. , Conrad, James E. , Reid, Jane A. , Fangman, Sarah, and Golden, Nadine, 2005, Nearshore Benthic Habitat GIS for the Channel Islands National Marine Sanctuary and Southern California State Fisheries Reserves, Volume II Edition 1.0: Open-File Report USGS OFR 2005-1170, U.S. Geological Survey, Coastal and Marine Geology Program, Western Coastal and Marine Geology, Santa Cruz, CA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -119.53
    East_Bounding_Coordinate: -119.45
    North_Bounding_Coordinate: 34.03
    South_Bounding_Coordinate: 33.98

  3. What does it look like?

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

    Beginning_Date: 21-May-1999
    Ending_Date: 18-Jul-2000
    Currentness_Reference: Ground Condition

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

    Geospatial_Data_Presentation_Form: map

  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 7394 x 5401, type Pixel

    2. What coordinate system is used to represent geographic features?

  7. How does the data set describe geographic features?

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?

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

    Guy R. Cochrane
    United States Geological Survey (USGS)
    Geophysicist
    USGS, 400 Natural Bridges Drive
    Santa Cruz, CA 95060-5792
    USA

    (831) 427-4754 (voice)
    (831) 427-4748 (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: 17-Jul-1999 (process 1 of 15)
    xtfin FILES> /work2/guy/ecru/cru19=/work2/guy/ecru/cru19.xtf PARAMS> LCHAN=2,RCHAN=1 PARAMS> RATE2

    Date: 18-Jul-1999 (process 2 of 15)
    navmerge FILES> //work2/guy/ecru/cru19,/work2/guy/ecru/m199sc PARAMS> LATLON

    Date: 21-Jul-1999 (process 3 of 15)
    snrshade FILES> /work2/guy/ecru/cru19_snr=/work2/guy/ecru/cru19 PARAMS> MIN=1,MAX=254

    Date: 21-Jul-1999 (process 4 of 15)
    navflt FILES> /work2/guy/ecru/cru19_snr PARAMS> NR=9,ALTITUDE

    Date: 21-Jul-1999 (process 5 of 15)
    navflt FILES> /work2/guy/anacapa/ana25_dk=/work2/guy/anacapa/ana25 PARAMS> NR=101,HEADING

    Date: 21-Jul-1999 (process 6 of 15)
    slr2gr FILES> /work2/guy/ecru/cru19_snr_sg=/work2/guy/ecru/cru19_snr PARAMS> PIXRES=0.15,NANGLE=90,FANGLE=0.5,LOFFSET=0,ROFFSET=0

    Date: 21-Jul-1999 (process 7 of 15)
    shade FILES> /work2/guy/ecru/cru19_snr_sg_sh=/work2/guy/ecru/cru19_snr_sg PARAMS> MULT,MIN=1,MAX=254,SL=1,EL=9273

    Date: 21-Jul-1999 (process 8 of 15)
    destripe FILES> /work2/guy/ecru/cru19_snr_sg_sh_ds2=/work2/guy/ecru/cru19_snr_sg_sh PARAMS> LNL=501,LNS=501,LLOW=1,LHIGH=254,HNL=501,HNS=31,HLOW=1,HHIGH=254

    Date: 21-Jul-1999 (process 9 of 15)
    deltav FILES> /work2/guy/ecru/ecr19_dv=/work2/guy/ecru/ecr19_pr PARAMS> PIXRES=0.15

    Date: 22-Jul-1999 (process 10 of 15)
    snrgeom FILES> work2/guy/ecru/ecr19_gm=/work2/guy/ecru/ecr19_dv PARAMS> UTM PARAMS> WGS84 PARAMS> ZONE=10,SCALE=0.9996 PARAMS> SLAT=33.979,SLON=-119.4585768844615,ELAT=34.02489162004511,ELON=-119.4512008953342,ROTATION=0,PIXRES=0.15

    Date: 23-Jul-1999 (process 11 of 15)
    digmos FILES> /work2/guy/ecru/ecr19_mos=/work2/guy/ecru/ecr19_gm PARAMS> PROJECTION PARAMS> SLAT=33.979,SLON=-119.531,ELAT=34.027,ELON=-119.452

    Date: 23-Jul-1999 (process 12 of 15)
    digmos FILES> /work2/guy/ecru/ecr19_shf=/work2/guy/ecru/ecr19_mos PARAMS> MANUAL PARAMS> ONL=37176,ONS=49888 PARAMS> ISL=591,ISS=1,IEL=37176,IES=49888,OSL=1,OSS=1

    Date: 23-Jul-1999 (process 13 of 15)
    maskim FILES> /work2/guy/ecru/ecr19_msk=/work2/guy/ecru/ecr19_mos,/work2/guy/ecru/ecr19_ras PARAMS>

    Date: 23-Jul-1999 (process 14 of 15)
    digmos FILES> /work2/guy/ecru/ecr_msk=/work2/guy/ecru/ecr19_msk PARAMS> ISL=1,ISS=1,IEL=37176,IES=49888,OSL=1,OSS=1 PARAMS> OUTPUT

    Date: 03-Aug-1999 (process 15 of 15)
    scale FILES> /work5/guy/sanp/sanp1m=/work5/guy/sanp/ecr_mos PARAMS> NL=5576,NS=7483

  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:
Please recognize the U.S. Geological Survey (USGS) as the source of this information.

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.

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)

    United States Geological Survey (USGS)
    c/o Guy R. Cochrane
    Geophysicist
    USGS, 400 Natural Bridges Drive
    Santa Cruz, CA 95060-5792
    USA

    (831) 427-4754 (voice)
    (831) 427-4748 (FAX)
    gcochrane@usgs.gov

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

  3. What legal disclaimers am I supposed to read?

    Please recognize the U.S. Geological Survey (USGS) as the source of this information.

    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.

  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 2005
Last Reviewed: 2005
Metadata author:
United States Geological Survey (USGS)
c/o Guy R. Cochrane
Geophysicist
USGS, 400 Natural Bridges Drive
Santa Cruz, CA 95060-5792
USA

(831) 427-4754 (voice)
(831) 427-4748 (FAX)
gcochrane@usgs.gov

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata ("CSDGM version 2") (FGDC-STD-001-1998)

Generated by mp version 2.8.20 on Wed May 04 16:11:20 2005