chanwest_back.html

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Metadata:

Edition: Version 2.0, 2010
Geospatial_Data_Presentation_Form: map
Larger_Work_Citation:
Citation_Information:
Originator: Guy R. Cochrane
Originator: Nadine Golden
Originator: Pete Dartnell
Originator: Donna Schroeder
Originator: Jamie Conrad
Originator: Andy Stevenson
Publication_Date: 2007
Title:
Seafloor Mapping and Benthic Habitat GIS for Southern California, Volume III
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2007-1271
Publication_Information:
Publication_Place: Santa Cruz, CA
Publisher: U.S. Geological Survey
Online_Linkage: <https://pubs.usgs.gov/of/2007/1271/>

Description:
Abstract:
Bathymetric sidescan sonar data of the nearshore seafloor (0 to 100 m water depths) of the Santa Barbara Channel area collected in 2005. A 234 kHz Interferometric Submetix Swath Bathy Sonar System; SEA Swath Processor, v. 2.05, SEA Grid Processor v. 2.05, was used for geophysical surveying. The 2005 survey was navigated with a CodaOctopus, Model F180, Differential Global Positioning System (DGPS). 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). 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.
Purpose:
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.
Supplemental_Information:
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.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20050808
Ending_Date: 20050827
Currentness_Reference: ground condition

Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed

Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -119.643628
East_Bounding_Coordinate: -119.471725
North_Bounding_Coordinate: 34.390598
South_Bounding_Coordinate: 34.320467

Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: bathymetry
Theme_Keyword: sidescan sonar
Theme_Keyword: remote-sensing
Theme_Keyword: MIPS
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: CMGP
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificinformation
Theme_Keyword: imagereyBaseMapsEarthCover
Theme_Keyword: oceans
Theme_Keyword: elevation
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Channel Islands National Marine Sanctuary
Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: Santa Barbara
Place_Keyword: Ventura
Place_Keyword: Santa Barbara Channel
Place_Keyword: Channel Islands
Place_Keyword: California



Access_Constraints: None
Use_Constraints:
Public domain data from the U.S. government is freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Guy R. Cochrane
Contact_Organization: U.S. Geological Survey, Coastal and Marine Geology
Contact_Position: Geophysicist
Contact_Address:
Address_Type: mailing and physical address
Address: USGS Pacific Science Center, 400 Natural Bridges Drive
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060-5792
Country: USA
Contact_Voice_Telephone: (831) 427-4754
Contact_Facsimile_Telephone: (831) 427-4748
Contact_Electronic_Mail_Address: gcochrane@usgs.gov

Browse_Graphic:
Browse_Graphic_File_Name: images/chanwest_back.jpg
Browse_Graphic_File_Description:
Image showing coverage of Channel West backscatter data ArcInfo format.
Browse_Graphic_File_Type: JPEG


Native_Data_Set_Environment:
SunOS, 5.7, sun4u UNIX Windows XP Professional, v. 2002, service pack 2 SEA Grid Processor v. 2.051 ArcGIS version 9.1

Data_Quality_Information:

Logical_Consistency_Report: Logical Consistency untested.

Completeness_Report:
Please see the Methods section of <https://pubs.usgs.gov/of/2007/1271/> for information about omissions, selection criteria, generalization, definitions used, and other rules used to derive the data set.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: On the order of 10 meters.

Lineage:
Process_Step:
Process_Description:
Started with SXP files that were the output from A 468 kHz Interferometric Submetix Swath Bathy Sonar System. Based on the Julian date at original data collection, individually imported each raw backscatter file into "SEA Swath Processor Real-Time Software System." Configured the way the data was processed in "SEA Swath Processor" by inputting adjustment and offset information, such as ship's motion, tides, velocity of sound, and relative sensor positions.
Process_Date: 20060702
Process_Step:
Process_Description:
Used the "SonarWiz.MAP Sonar File Manager" tool: check and correct the navigation data. Manually "bottom-tracked" each line. Applied signal processing functions by setting the Automatic Gain Control (AGC), Beam Angle Correction (BAC), project sonar data using sensor headings. Individually exported the line as a GeoTif file.
Process_Date: 200060705
Process_Step:
Process_Description:
Looped through the directory of GeoTif files and convert GeoTif to ArcGIS raster format. Removed "NoData" raster cells using the ArcGIS Con statement; and projected the data to WGS 1984 UTM Zone 11. 

  **** Ascii to ArcRaster & Project Pyramids (Python Script)****
  # ---------------------------------------------------------------------------
  # ascii_to_arcraster_project_pyramids_stand_alone.py
          # Created on: Tuesday Oct 04 2006
  # Nadine Golden
  # ---------------------------------------------------------------------------

  # Import system modules
  import glob, sys, string, os, win32com.client

  # Create the Geoprocessor object
  gp = win32com.client.Dispatch("esriGeoprocessing.GpDispatch.1")

  # Load required toolboxes...
  gp.AddToolbox("E:/ArcGIS/ArcToolbox/Toolboxes/Data Management Tools.tbx")
  gp.AddToolbox("E:/ArcGIS/ArcToolbox/Toolboxes/Conversion Tools.tbx")

  files = glob.glob("F:/test/grids/*asc")
  for file in files:
      (basename, ext) = os.path.splitext(file)
      ingrid = file
      outgrid = basename + "tmp"
      os.system("scii_to_arcraster_project_pyramids_stand_alone.py %s %s" % (ingrid, outgrid))

      # Process: ASCII to Raster...
      gp.ASCIIToRaster_conversion(ingrid, outgrid, "INTEGER")

  ##    # Process: Define Projection...
  ##    gp.DefineProjection_management(outgrid,                                                                     "PROJCS['NAD_1983_UTM_Zone_11N',GEOGCS['GCS_North_American_1983',DATUM['D_North_American_1983',
            SPHEROID['GRS_1980',6378137.0,298.257222101]],
            PRIMEM['Greenwich',0.0],
            UNIT['Degree',0.0174532925199433]],
            PROJECTION['Transverse_Mercator'],
            PARAMETER['False_Easting',500000.0],
            PARAMETER['False_Northing',0.0],
            PARAMETER['Central_Meridian',-117.0],
            PARAMETER['Scale_Factor',0.9996],
            PARAMETER['Latitude_Of_Origin',0.0],
            UNIT['Meter',1.0]]")

      # Process: Project Raster...
      finalgrid = basename
      gp.ProjectRaster_management(outgrid, finalgrid,                 "PROJCS['WGS_1984_UTM_Zone_11N',GEOGCS['GCS_WGS_1984',DATUM['D_WGS_1984',
          SPHEROID['WGS_1984',6378137.0,298.257223563]],
          PRIMEM['Greenwich',0.0],
          UNIT['Degree',0.0174532925199433]],
          PROJECTION['Transverse_Mercator'],
          PARAMETER['False_Easting',500000.0],
          PARAMETER['False_Northing',0.0],
          PARAMETER['Central_Meridian',-117.0],
          PARAMETER['Scale_Factor',0.9996],
          PARAMETER['Latitude_Of_Origin',0.0],
          UNIT['Meter',1.0]];
          -10000 -10000 100000;0 100000;0 100000", "NEAREST", "1")

      # Process: Build Pyramids...
      gp.BuildPyramids_management(finalgrid)

      # Clean up the mess
      gp.Delete(outgrid)
Process_Date: 200060705
Process_Step:
Process_Description:
Looped through the directory arcgrids and normalized the backscatter values using the Python script "RasterStats.py." 

  **** Rasters Statistics for Normalizing Data (Python Script)****
  # ---------------------------------------------------------------------------
  # RasterStats.py
  # To Calculate the mean value of a raster
  # Created on: Thursday Oct 20, 2006
  # Nadine Golden
  # ---------------------------------------------------------------------------

  # Import system modules
  import sys, string, os, win32com.client

  # Create the Geoprocessor object
  gp = win32com.client.Dispatch("esriGeoprocessing.GpDispatch.1")

  # Check out any necessary licenses
  gp.CheckOutExtension("spatial")

  # Load required toolboxes...
  gp.AddToolbox("E:/ArcGIS/ArcToolbox/Toolboxes/Spatial Analyst Tools.tbx")
  gp.AddToolbox("E:/ArcGIS/RasterStatsTool/RasterStatistics.tbx")

  #Directory of grids
  gp.Workspace = "F:\\test"
  rasterlist = gp.ListRasters()
  name = rasterlist.Next()
  while name:
      print name

      # Process: RasterBand Statistics...
      mean = gp.RasterBandStatistics(name, "MEAN")

      print mean

      # Process: Minus...
      (indir,basename) = os.path.split(name)
      outgrid = os.path.join("F:\\test\\Normalized", basename)
      gp.Minus_sa(name, mean, outgrid)

      print outgrid

      name = rasterlist.Next()
Process_Date: 200060715
Process_Step:
Process_Description:
In ArcGIS, imported lines according to track line number and mosaiced adjacent backscatter lines. Mosaicing was done by manually drawing a mask around the best possible data for each line and it's overlapping lines. Best possible data was determined subjectively and included the least no data values as possible in the overlapping areas.
Process_Date: 20060722
Process_Step:
Process_Description:
Projected chanwest_back file available at <https://pubs.usgs.gov/of/2007/1271/> from UTM, zone 10N, WGS84 coordinates to UTM, zone 11N, WGS84 coordinates.
Process_Date: 2010

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Pixel
Row_Count: 7308
Column_Count: 7325

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: WGS_1984_UTM_Zone_11N
Polar_Stereographic:
Straight-Vertical_Longitude_from_Pole: -117
Standard_Parallel: 0.999600
False_Easting: 500000.000
False_Northing: 0.000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair


Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey, Coastal and Marine Geology
Contact_Person: Guy R. Cochrane
Contact_Position: Geophysicist
Contact_Address:
Address_Type: mailing and physical address
Address: USGS Pacific Science Center, 400 Natural Bridges Drive
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060-5792
Country: USA
Contact_Voice_Telephone: (831) 427-4754
Contact_Facsimile_Telephone: (831) 427-4748
Contact_Electronic_Mail_Address: gcochrane@usgs.gov

Distribution_Liability:
Although this data set has been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or related materials. 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.
Metadata_Reference_Information:
Metadata_Date: 2010
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey, Coastal and Marine Geology
Contact_Person: Peter Dartnell
Contact_Position: Physical Scientist
Contact_Address:
Address_Type: mailing and physical address
Address: USGS 345 Middlefield Rd
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025
Country: USA
Contact_Voice_Telephone: (650)329-5460
Contact_Electronic_Mail_Address: pdartnell@usgs.gov

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Generated by mp version 2.9.8 on Mon Jun 28 14:23:46 2010