Sidescan-Sonar mosaic of Lake Mohave, MrSid format : Geographic NAD83 Coordinates

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: David S. Foster
Originator: VeeAnn A. Cross
Publication_Date: 2005
Title:
Sidescan-Sonar mosaic of Lake Mohave, MrSid format : Geographic NAD83 Coordinates
Geospatial_Data_Presentation_Form: remote-sensing image
Online_Linkage:
<http://pubs.usgs.gov/of/2004/1247/data/sidescan/geographic/sscan_geog.sid.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: -114.733562
East_Bounding_Coordinate: -114.549422
North_Bounding_Coordinate: 35.870509
South_Bounding_Coordinate: 35.199193
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: MrSid
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 geographic, NAD83 datum using BlueMarble Geographic Transformer, version 5.0. An affine transformation, with a central latitude of 35.534855555556 was used in this process.
Process_Step:
Process_Description:
This TIFF image was then compressed using LizardTech's MrSid GeoSpatial Encoder version 1.4.
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Pixel
Row_Count: 37241
Column_Count: 8312
Vertical_Count: 1
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Geographic_Coordinate_Units: Decimal degrees
Planar:
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 0.000022
Ordinate_Resolution: 0.000018
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:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Band_1
Attribute:
Attribute_Label: ObjectID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Value
Attribute:
Attribute_Label: Count
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: 4.807
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
Generated by mp version 2.8.12 on Tue Sep 28 15:48:33 2004