Chirp Seismic Shotpoint Navigation every 100 shots in Geographic Coordinates - Lake Mead Survey 2000

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 C. Twichell

Originator: VeeAnn A. Cross

Publication_Date: 2003

Title:

Chirp Seismic Shotpoint Navigation every 100 shots in Geographic Coordinates - Lake Mead Survey 2000

Geospatial_Data_Presentation_Form: vector digital data

Online_Linkage:

Larger_Work_Citation:

Citation_Information:

Originator: David C. Twichell

Originator: VeeAnn A. Cross

Originator: Stephen D. Belew

Publication_Date: 2003

Title:

Mapping the floor of Lake Mead (Nevada and Arizona): Preliminary discussion and GIS data release

Edition: 1.0

Series_Information:

Series_Name: Open-File Report

Issue_Identification: 03-320

Publication_Information:

Publication_Place: Woods Hole Field Center, Woods Hole, MA

Publisher: U.S. Geological Survey

Description:

Abstract:

Lake Mead is a large interstate reservoir located in the Mojave Desert of southeastern Nevada and northwestern Arizona. It was impounded in 1935 by the construction of Hoover Dam and is one of a series of multi-purpose reservoirs on the Colorado River. The lake extends 183 km from the mouth of the Grand Canyon to Black Canyon, the site of Hoover Dam, and provides water for residential, commercial, industrial, recreational, and other non-agricultural users in communities across the southwestern United States. Extensive research has been conducted on Lake Mead, but a majority of the studies have involved determining levels of anthropogenic contaminants such as synthetic organic compounds, heavy metals and dissolved ions, furans/dioxins, and nutrient loading in lake water, sediment, and biota (Preissler, et al., 1998; Bevans et al, 1996; Bevans et al., 1998; Covay and Leiker, 1998; LaBounty and Horn, 1997; Paulson, 1981). By contrast, little work has focused on the sediments in the lake and the processes of deposition (Gould, 1951). To address these questions, sidescan-sonar imagery and high-resolution seismic-reflection profiles were collected throughout Lake Mead by the USGS in cooperation with researchers from University of Nevada Las Vegas (UNLV). These data allow a detailed mapping of the surficial geology and the distribution and thickness of sediment that has accumulated in the lake since the completion of Hoover Dam. Results indicate that the accumulation of post-impoundment sediment is primarily restricted to former river and stream beds that are now submerged below the lake while the margins of the lake appear to be devoid of post-impoundment sediment. The sediment cover along the original Colorado River bed is continuous and is typically greater than 10 m thick through much of its length. Sediment thickness in some areas exceeds 35 m while the smaller tributary valleys typically are filled with less than 4 m of sediment. Away from the river beds that are now covered with post-impoundment sediment, pre-impoundment alluvial deposits and rock outcrops are still exposed on the lake floor.

Purpose:

This ArcView shapefile is used to enable correlation between the seismic-reflection profiles and the sidescan-sonar imagery, geologic interpretation, and other features represented on the lake floor.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20000601

Ending_Date: 20000606

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -114.876823

East_Bounding_Coordinate: -114.737250

North_Bounding_Coordinate: 36.135924

South_Bounding_Coordinate: 36.081648

Keywords:

Theme:

Theme_Keyword_Thesaurus: General

Theme_Keyword: seismic

Theme_Keyword: navigation

Theme_Keyword: point

Theme_Keyword: chirp

Theme_Keyword: subbottom

Theme_Keyword: Knudsen

Theme_Keyword: shotpoint

Theme_Keyword: U.S. Geological Survey

Theme_Keyword: USGS

Theme_Keyword: Coastal and Marine Geology Program

Theme_Keyword: CMGP

Theme_Keyword: Woods Hole Field Center

Theme_Keyword: Open-File Report

Theme_Keyword: OFR03-320

Theme_Keyword: cruise serial number 00027

Place:

Place_Keyword_Thesaurus: General

Place_Keyword: Nevada

Place_Keyword: Lake Mead

Place_Keyword: Hoover Dam

Place_Keyword: Boulder Basin

Place_Keyword: Mojave Desert

Place_Keyword: Las Vegas Wash

Place_Keyword: Las Vegas Bay

Place_Keyword: United States

Place_Keyword: North America

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 C. Twichell

Contact_Organization: U.S. Geological Survey

Contact_Position: Oceanographer

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 x2266

Contact_Facsimile_Telephone: 508-457-2310

Contact_Electronic_Mail_Address: dtwichell@usgs.gov

Native_Data_Set_Environment:

Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 3; ESRI ArcCatalog 8.2.0.700

Cross_Reference:

Citation_Information:

Originator: H.E. Bevans

Originator: S.L. Goodbred

Originator: J.F. Miesner

Originator: S.A. Watkins

Originator: T.S. Gross

Originator: N.D. Denslow

Originator: T. Choeb

Publication_Date: 1996

Title:

Synthetic organic compounds and carp endrocrinology and histology, Las Vegas Wash and Las Vegas and Callville bays of Lake Mead Nevada

Series_Information:

Series_Name: Water-Resources Investigations

Issue_Identification: 96-4266

Publication_Information:

Publisher: U.S. Geological Survey

Cross_Reference:

Citation_Information:

Originator: H.E. Bevans

Originator: M.S. Lico

Originator: S.J. Lawrence

Publication_Date: 1998

Title:

Water quality in the Las Vegas Valley area and the Carson and Truckee River basins, Nevada and California, 1992-1996

Series_Information:

Series_Name: Circular

Issue_Identification: 1170

Publication_Information:

Publisher: U.S. Geological Survey

Cross_Reference:

Citation_Information:

Originator: K.J. Couvay

Originator: T.J. Leiker

Publication_Date: 1998

Title:

Synthetic organic compounds in water and bottom sediment from streams, detention basins, and sewage-treatment plant outfalls in Las Vegas Valley, Nevada, 1997

Series_Information:

Series_Name: Open-File Report

Issue_Identification: 98-633

Publication_Information:

Publisher: U.S. Geological Survey

Cross_Reference:

Citation_Information:

Originator: V.A. Cross

Originator: D.C. Twichell

Publication_Date: 2003

Title:

Archive of Seismic-Reflection Data Collected During USGS Cruise Lake Mead 00027 in Lake Mead - Nevada, 1-6 June, 2000

Series_Information:

Series_Name: Open-File Report

Issue_Identification: 03-004

Publication_Information:

Publisher: U.S. Geological Survey

Cross_Reference:

Citation_Information:

Originator: H.R. Gould

Publication_Date: 1951

Title: Some quantitative aspects of Lake Mead turbidity currents

Series_Information:

Series_Name: SEPM Special Publication

Issue_Identification: No. 2

Publication_Information:

Publisher: Society of Economic Paleontologists and Mineralogists

Cross_Reference:

Citation_Information:

Originator: J.F. LaBounty

Originator: M.J. Horn

Publication_Date: 1997

Title:

The influence of drainage from the Las Vegas Valley on the limnology of Boulder Basin, Lake Mead, Arizona-Nevada

Series_Information:

Series_Name: Journal of Lake and Reservoir Management

Issue_Identification: v. 13

Cross_Reference:

Citation_Information:

Originator: L.J. Paulson

Publication_Date: 1981

Title:

Nutrient management with hydroelectric dams on the Colorado River

Series_Information:

Series_Name: Technical Report

Issue_Identification: #8

Publication_Information:

Publication_Place:

Department of Biological Sciences, University of Nevada, Las Vegas, Nevada

Publisher: Lake Mead Limnological Research Center

Cross_Reference:

Citation_Information:

Originator: A.M. Preissler

Originator: G.A. Roach

Originator: K.A. Thomas

Originator: J.W. Wilson

Publication_Date: 1998

Title: Water resources data, Nevada, water year 1998

Series_Information:

Series_Name: Water Resources Data Nevada

Issue_Identification: NV-98-1

Publication_Information:

Publisher: U.S. Geological Survey

Data_Quality_Information:

Logical_Consistency_Report:

These data have been checked to remove obviously erroneous data points.

Completeness_Report:

These data represent shotpoint navigation for all the chirp seismic lines collected on this cruise.

Lineage:

Process_Step:

Process_Description:

This particular seismic data was acquired with a Knudsen chirp subbottom system with the data stored digitally on a laptop computer running the Knudsen system software. The navigation is stored in a separate file from the seismic SEG-Y data.

Process_Step:

Process_Description:

The shot point navigation for each line of seismic data was reformatted and combined into a single file. Since the navigation stored is in geographic coordinates, the X and Y positions were converted to UTM coordinates using PROJ.

Source_Used_Citation_Abbreviation:

Evenden, 1990, Cartographic Projection Procedures for the UNIX Environment -- A User's Manual: Open-file Report 90-284

Process_Step:

Process_Description:

The Knudsen system does not necessarily start each seismic file with shot 1. Since the SEG-Y data files were being processed so that each file started with shot 1, these navigation files needed to have the same correction. This way the shotpoint navigation will correspond to the plotted SEG-Y data.

Process_Step:

Process_Description:

The shot point navigation for each line of seismic data was combined into a single file and then resampled using DigiRule's GeoCad program to a shot interval of 100. The beginning and ending shot of each line was maintained.

Process_Step:

Process_Description:

These points were then imported into ArcView and saved as a shapefile.

Process_Step:

Process_Description:

These UTM shapefiles were then reprojected to the Geographic Coordinate system using ArcToolbox in ArcGIS 8.1

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Entity point

Point_and_Vector_Object_Count: 1614

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.0001

Longitude_Resolution: 0.0001

Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: D_WGS_1984

Ellipsoid_Name: WGS_1984

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257224

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: lm00_100sht

Entity_Type_Definition: ArcView shapefile attribute table

Entity_Type_Definition_Source: ESRI

Attribute:

Attribute_Label: FID

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: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: EASTING

Attribute_Definition: The UTM easting position of the shot point.

Attribute_Definition_Source: software generated

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 692808

Range_Domain_Maximum: 716830

Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: NORTHING

Attribute_Definition: The UTM northing position of the shot point.

Attribute_Definition_Source: software generated.

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 3988421

Range_Domain_Maximum: 4002759

Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: LINENUM

Attribute_Definition:

Line number assigned to the seismic line along which the shotpoint navigatin point falls.

Attribute_Definition_Source: data processor

Attribute_Domain_Values:

Unrepresentable_Domain: character set

Attribute:

Attribute_Label: SHOT

Attribute_Definition: The seismic shot number corresponding to that point.

Attribute_Definition_Source: software computed

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1

Range_Domain_Maximum: 7061

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: David C. Twichell

Contact_Organization: U.S. Geological Survey

Contact_Position: Oceanographer

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 x2266

Contact_Facsimile_Telephone: 508-457-2310

Contact_Electronic_Mail_Address: dtwichell@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 report 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: 0.165

Metadata_Reference_Information:

Metadata_Date: 20030204

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_Access_Constraints: none

Metadata_Use_Constraints: none

Metadata_Extensions:

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

Profile_Name: ESRI Metadata Profile