all_back.html

Metadata also available as - [Questions & Answers]

Metadata:

Identification_Information:

Citation:

Citation_Information:

Originator: Yael Sagy

Originator: David Finlayson

Publication_Date: 2007

Title:

all_back.txt - Sidescan sonar backscatter image (for the entier study area)
Edition: (Version 1.0, May 15, 2007)

Geospatial_Data_Presentation_Form: map

Larger_Work_Citation:

Citation_Information:

Originator: Jonathan Warrick
Originator: Guy R. Cochrane
Originator: Yael Sagy
Originator: David Finlayson
Originator: Jodi Harney

Publication_Date: 2006 (publication in process)

Title:
Sea-Floor Mapping and Benthic Habitat GIS at the mouth of the Elwha River, Washington.

Geospatial_Data_Presentation_Form: map

Series_Information:

Series_Name: USGS Data Series

Issue_Identification: 320

Publication_Information:

Publication_Place: Santa Cruz, CA

Publisher: U.S. Geological Survey

Online_Linkage: <URL:https://pubs.usgs.gov/ds/320)>



Description:

Abstract:

The sonar amplitude image of the nearshore sea floor (0 to 80 m water depths)
of the Elwha River mouth area was mosaicked from data 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). The sidescan
fish was towed approximately 30 m above the sea floor. 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 0.25 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/research/projects/benthic_hab.html> 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:

Additional information about the field activities from
which this data set was derived are available online at <http://walrus.wr.usgs.gov/infobank/k/k105ps/html/k-1-05-ps.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.ent.


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: 20050315

Ending_Date: 20050331

Currentness_Reference: Ground Condition



Status:

Progress: Complete

Maintenance_and_Update_Frequency: As Needed





Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -123.636376

East_Bounding_Coordinate: -123.589273

North_Bounding_Coordinate: 48.162431

South_Bounding_Coordinate: 48.137074



Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: Coastal Geology

Theme_Keyword: Marine Geology

Theme_Keyword: sidescan sonar

Theme_Keyword: remote-sensing image

Theme_Keyword: MIPS

Place:

Place_Keyword_Thesaurus: None
Place_Keyword: Washington
Place_Keyword: North Pacific Ocean
Place_Keyword: Northern Pacific Ocean
Place_Keyword: USA
Place_Keyword: Olympic National Park
Place_Keyword: Freshwater Bay
Place_Keyword: Elwha River
Place_Keyword: Ediz Hook
Place_Keyword: Juan de Fuca Straits
Place_Keyword: Port Angeles







Access_Constraints: None



Use_Constraints: None



Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Guy R. Cochrane

Contact_Organization:

United States Geological Survey (USGS)
Coastal and Marine Geology Program (CMGP)
Contact_Position: Geophysicist

Contact_Address:

Address_Type: mailing and physical address

Address: USGS, MailStop 999, 400 Natural Bridges Ave.

City: Santa Cruz

State_or_Province: CA

Postal_Code: 95060

Country: USA

Contact_Voice_Telephone: (831) 427-4754

Contact_Facsimile_Telephone: (831) 427-4748

Contact_Electronic_Mail_Address: gcochrane@usgs.gov


Data_Set_Credit:
The authors would like to thank, Larry Kooker, Mike Boyle, Gerry Hatcher, Dave Hogg, and Hank Chezar at the USGS Marine Facility (Redwood City, CA) contributed field support and logistical support. Andrew Stevenson from the USGS Coastal and Marine Program. The R/V Karluk was piloted by Katherine Peet from NOAA.

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:



Attribute_Accuracy:

Attribute_Accuracy_Report: Accuracy Unknown



Logical_Consistency_Report: Logical Consistency untested.



Completeness_Report: Completeness unknown

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report: On the order of 10 meters.



Lineage:
Process_Step:
Process_Description:
The following processing steps were applied in the same manner to all of the five backscatter grids: amp_east1_st, amp_mid_1_st, amp_mid_2_st, amp_west_1_st, am-_west_2_st. Started with .sxr files that were the output from A 234 kHz Interferometric Submetrix
Sonar System, We used Sonar WiazMap4 to process the sonar data. after importing the .sxr files to Sonar WiazMap4 we used the sonar file manager tool to 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), set Resolution to 35 and Darkness to 50, project sonar data using sensor headings.
Individually exported each line as a GeoTif file with resolution of 0.25 meter/pixel.
Process_Date: 20060915

Process_Step:
Process_Description:
In ArcMap convert the .TIF files to ESRIGRID using Raster to Other command. Import the lines according to track line number and remov NoData raster cells using the ArcGIS Con statement.
Process_Date: 20060925

Process_Step:
Process_Description:
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. Merging the masked lines (create a mosaic) together using Mosaic To New Raster with the option "First" such that the better lines are on top.
Process_Date: 20060909



Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Pixel

Row_Count: 11163

Column_Count: 13926



Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

United States Geological Survey (USGS)
Coastal and Marine Geology Program (CMGP)
Contact_Person: Guy R. Cochrane

Contact_Position: Geophysicist

Contact_Address:

Address_Type: mailing and physical address

Address: USGS, 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:

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.


Metadata_Reference_Information:

Metadata_Date: 2007

Metadata_Review_Date: 2007

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

United States Geological Survey (USGS)
Coastal and Marine Geology Program (CMGP)
Contact_Person: Guy R. Cochrane

Contact_Position: Geophysicist

Contact_Address:

Address_Type: mailing and physical address

Address: USGS, 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

Metadata_Standard_Name:
FGDC Content Standards for Digital Geospatial Metadata ("CSDGM version 2")

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Access_Constraints: none

Metadata_Use_Constraints: none







Generated by mp version 2.9.2 on Fri Jul 27 12:09:44 2007