chanwest_back.txt - Sidescan sonar backscatter image for Channel West in the Nearshore Benthic Habitat Mapping Project S. California map series.

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Nadine E. Golden

Originator: Guy R. Cochrane

Publication_Date: 2007

Title:

chanwest_back.txt - Sidescan sonar backscatter image for Channel Westin the Nearshore Benthic Habitat Mapping Project S. California map series.

Edition: Version 1.0, July 15, 2006

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: <http://pubs.usgs.gov/of/2007/1271/>

Description:

Abstract:

The sidescan sonar image of the nearshore seafloor (0 to 100 m water depths)of the Santa Barbara Channel area was mosaicked from data collectedin 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 GlobalPositioning System (DGPS). A KVH Industries Inc. azimuth digitalgyro-compass provided ship headings with 0.5 degree accuracy. Navigationdata were recorded using Yo-Nav version 1.19 (Gann, 1992). The sidescanfish was towed approximately 30 m above the seafloor. The distance ofthe fish behind the ship was not known during this survey and must beestimated when the data are processed in order to produce the sidescanimage 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 geographicinformation system of spatially referenced data related tothe USGS Coastal and Marine Geology Program Nearshore Benthic Habitat MappingProject. See <http://walrus.wr.usgs.gov/nearshorehab> for more information.

Purpose:

These data are intended for science researchers, students, policymakers, and the general public. The data can beused with geographic information systems (GIS) softwareto display geologic and oceanographic information.

Supplemental_Information:

Any use of trade, product, or firm names is for descriptive purposesonly and does not imply endorsement by theU.S. Government.

Although this Federal Geographic Data Committee-compliant metadatafile is intended to document the data set in nonproprietary form,as well as in ArcInfo format, this metadata file may include someArcInfo-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 redistributablewith 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 ofChannel West backscatter data ArcInfo format.

Browse_Graphic_File_Type: JPEG

Native_Data_Set_Environment:

SunOS, 5.7, sun4u UNIXWindows XP Professional, v. 2002, service pack 2SEA Grid Processor v. 2.051ArcGIS version 9.1

Data_Quality_Information:

Logical_Consistency_Report: Logical Consistency untested.

Completeness_Report:

Please see the Methods section of <http://pubs.usgs.gov/of/2007/1271/> forinformation 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 SubmetixSwath Bathy Sonar System. Based on the Julian date at original data collection,individually imported each raw backscatter file into ìSEA Swath Processor Real-Time Software System.îConfigured the way the data was processed in ìSEA Swath Processorî 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 ìSonarWiz.MAP Sonar File Managerî tool: check and correct the navigation data.Manually ìbottom-trackedî 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 ìNoDataî 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 andit's overlapping lines. Best possible data was determined subjectively and included the leastno data values as possible in the overlapping areas.

Process_Date: 20060722

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Pixel

Row_Count: 7308

Column_Count: 7325

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 USGSas 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 USGSin the use of these data or related materials.

Any use of trade, product, or firm names isfor descriptive purposes only and does not implyendorsement by the U.S. Government.

Metadata_Reference_Information:

Metadata_Date: 20070711

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey, Coastal and Marine Geology

Contact_Person: Nadine Golden

Contact_Position: Geographer

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) 427-4730

Contact_Facsimile_Telephone: (831) 427-4748

Contact_Electronic_Mail_Address: ngolden@usgs.gov

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998