TIFF Sidescan-Sonar mosaic of Lake Mohave : UTM, Zone 11, NAD83 Projection

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: David S. Foster

Originator: VeeAnn A. Cross

Publication_Date: 2005

Title:

TIFF Sidescan-Sonar mosaic of Lake Mohave : UTM, Zone 11, NAD83 Projection

Geospatial_Data_Presentation_Form: remote-sensing image

Online_Linkage:

<http://pubs.usgs.gov/of/2004/1247/data/sidescan/utm/sscan_utm11.tif.zip>

Larger_Work_Citation:

Citation_Information:

Originator: VeeAnn A. Cross

Originator: David S. Foster

Originator: David C. Twichell

Publication_Date: 2005

Title: Lake Mohave Geophysical Survey 2002: GIS Data Release

Series_Information:

Series_Name: Open-File Report

Issue_Identification: 2004-1247

Publication_Information:

Publication_Place: Woods Hole Science Center, Woods Hole, MA

Publisher: U.S. Geological Survey

Online_Linkage: <http://pubs.usgs.gov/of/2004/1247>

Description:

Abstract:

Lake Mohave is one of several multi-purpose reservoirs that have been constructed on the Colorado River. The lake was formed upon completion of the Davis Dam in 1953. No mapping of the floor of the lake had been conducted since completion of the Davis Dam. The U.S. Geological Survey, in cooperation with researchers from the University of Nevada Las Vegas, completed a geophysical survey of this lake in April 2002. The survey included collection of sidescan sonar imagery of nearly the entire lake floor, and high-resolution seismic-reflection profiles along widely spaced lines throughout the lake. The detailed mapping of the lake floor was used to determine the amount of sediment that had accumulated in the lake since impoundment, its distribution, and the processes of deposition.

Purpose:

This sidescan-sonar imagery is used to map the morphology of the lake floor and determine the extent of sediment distribution on the lake floor.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20020418

Ending_Date: 20020425

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -114.733561

East_Bounding_Coordinate: -114.549418

North_Bounding_Coordinate: 35.870509

South_Bounding_Coordinate: 35.199202

Keywords:

Theme:

Theme_Keyword_Thesaurus: General

Theme_Keyword: CMGP

Theme_Keyword: Coastal and Marine Geology Program

Theme_Keyword: images

Theme_Keyword: lake

Theme_Keyword: OF 2004-1247

Theme_Keyword: Open-File Report

Theme_Keyword: reservoir

Theme_Keyword: sidescan

Theme_Keyword: sidescan sonar

Theme_Keyword: U.S. Geological Survey

Theme_Keyword: USGS

Theme_Keyword: Woods Hole Science Center

Theme_Keyword: DF1000

Theme_Keyword: TIFF

Theme_Keyword: field activity identifier H-1-02-SW

Theme_Keyword: field activity serial number 02020

Place:

Place_Keyword_Thesaurus: General

Place_Keyword: Arizona

Place_Keyword: Colorado River

Place_Keyword: Hoover Dam

Place_Keyword: Lake Mohave

Place_Keyword: Las Vegas

Place_Keyword: Mojave Desert

Place_Keyword: Nelson's Landing

Place_Keyword: Nevada

Place_Keyword: North America

Place_Keyword: United States

Access_Constraints: None.

Use_Constraints:

The U.S. Geological Survey must be referenced as the originator of the dataset in any future products or research derived from these data.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: David S. Foster

Contact_Organization: U.S. Geological Survey

Contact_Position: Geologist

Contact_Address:

Address_Type: mailing and physical address

Address: 384 Woods Hole Rd.

City: Woods Hole

State_or_Province: MA

Postal_Code: 02543-1598

Contact_Voice_Telephone: (508) 548-8700 x2271

Contact_Facsimile_Telephone: (508) 457-2310

Contact_Electronic_Mail_Address: dfoster@usgs.gov

Native_Data_Set_Environment:

Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 8.3.0.800

Cross_Reference:

Citation_Information:

Originator: W.W. Danforth

Originator: T.F. O'Brien

Originator: W.C. Schwab

Publication_Date: 1991

Title:

USGS image processing system: near real-time mosaicking of high-resolution sidescan-sonar data

Series_Information:

Issue_Identification: Jan. 1991

Publication_Information:

Publisher: Sea Technology

Cross_Reference:

Citation_Information:

Originator: V.F. Paskevich

Publication_Date: 1992

Title:

Digital mapping of sidescan sonar data with the Woods Hole Image Processing System software

Series_Information:

Series_Name: Open-File Report

Issue_Identification: 92-536

Publication_Information:

Publisher: U.S. Geological Survey

Cross_Reference:

Citation_Information:

Originator: V.F. Paskevich

Publication_Date: 1996

Title:

MAPIT: An improved method for mapping digital sidescan sonar data using the Woods Hole Image Processing System (WHIPS) Software

Series_Information:

Series_Name: Open-File Report

Issue_Identification: 96-281

Publication_Information:

Publisher: U.S. Geological Survey

Data_Quality_Information:

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Quantitative_Horizontal_Positional_Accuracy_Assessment:

Horizontal_Positional_Accuracy_Value: 10-30m

Horizontal_Positional_Accuracy_Explanation:

The ship was navigated with a PLGR system with an assumed navigational accuracy of +/- 10m. Range to towfish was used to estimate the towfish position. Due to the inherent inaccuracies in this method, plus navigational smoothing and mosaicking issues, the accuracy is assumed to be closer to the 20-30m value.

Lineage:

Process_Step:

Process_Description:

Sidescan sonar imagery was collected using an Edgetech DF1000 sidescan sonar system and logged to a Triton QMIPS data logging computer. The data were collected at a 150m, 200m, 400m, or 600m swath, 1024 pixels/side, 16-bit. The digital sidescan data were then processed and mapped to provide proper geographic locations of features identified in the imagery. The processing steps included subsampling the raw sidescan data using a median filtering routine to suppress speckle noise and reduce file size, and correct for slant-range distortion, signal attenuation, and dropped sonar lines using XSonar (Danforth et al., 1991).

Process_Step:

Process_Description:

The digital sidescan data were then processed and mapped to provide proper geographic locations of features identified in the imagery. The processing steps included subsampling the raw sidescan data using a median filtering routine to suppress speckle noise and reduce file size, and correct for slant-range distortion, signal attenuation, and dropped sonar lines using XSonar (Danforth et al., 1991).

Process_Step:

Process_Description:

The imagery was mapped into its proper geographic location using the XSonar software. Individual sidescan swaths were mapped with each pixel geographically positioned at a resolution of 2 m/pixel.

Process_Step:

Process_Description:

Non-overlapping swaths were then brought into the remote sensing software package PCI. The techniques for generating the composite digital sidescan mosaic are summarized by Paskevich (1996). The imagery portion was then cut out and written to a PCI channel with a white background. A LUT was applied to the imagery such that the image contains values 0-254. Because the background is 255, that color can be made transparent when viewing in a GIS.

Process_Step:

Process_Description:

The image was then exported from PCI as a geotiff image with an associated world file.

Process_Step:

Process_Description:

Because the original mosaicking was done in UTM, Zone 11, WGS84, the resulting TIFF image was then reprojected to the NAD83 datum using BlueMarble Geographic Transformer, version 5.0. This ensures that all the GIS data are in the same datum.

Process_Step:

Process_Description:

This TIFF image was then opened in Corel PhotoPaint v. 10 and saved with PackBit compression.

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Pixel

Row_Count: 37079

Column_Count: 7466

Vertical_Count: 1

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: Universal Transverse Mercator

Universal_Transverse_Mercator:

UTM_Zone_Number: 11

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.999600

Longitude_of_Central_Meridian: -117.000000

Latitude_of_Projection_Origin: 0.000000

False_Easting: 500000.000000

False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: row and column

Coordinate_Representation:

Abscissa_Resolution: 2.000000

Ordinate_Resolution: 2.000000

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257222

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

The pixel value represents the DN return value of the sidescan-sonar system. A high value (i.e. 255) indicates a highly reflective lake floor surface, while a low value (i.e. 0) indicates low reflectance.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: David S. Foster

Contact_Organization: U.S. Geological Survey

Contact_Position: Geologist

Contact_Address:

Address_Type: mailing and physical address

Address: 384 Woods Hole Rd.

City: Woods Hole

State_or_Province: MA

Postal_Code: 02543-1598

Contact_Voice_Telephone: (508) 548-8700 x2271

Contact_Facsimile_Telephone: (508) 457-2310

Contact_Electronic_Mail_Address: dfoster@usgs.gov

Resource_Description: Downloadable Data

Distribution_Liability:

These data were prepared by an agency of the United States Government. Neither the United States government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States government or any agency thereof. Although all data published in this publication have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and/or the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data, software, or related materials.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Transfer_Size: 22.447

Metadata_Reference_Information:

Metadata_Date: 20040928

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: VeeAnn A. Cross

Contact_Organization: U.S. Geological Survey

Contact_Position: Marine Geologist

Contact_Address:

Address_Type: mailing and physical address

Address: 384 Woods Hole Rd.

City: Woods Hole

State_or_Province: MA

Postal_Code: 02543-1598

Contact_Voice_Telephone: (508) 548-8700 x2251

Contact_Facsimile_Telephone: (508) 457-2310

Contact_Electronic_Mail_Address: vatnipp@usgs.gov

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile