David C. Twichell
VeeAnn A. Cross
2003
Chirp Seismic Shotpoint Navigation every 100 shots in Geographic Coordinates - Lake Mead Survey 2000
vector digital data
Open-File Report
03-320
Woods Hole Coastal and Marine Science Center, Woods Hole, MA
U.S. Geological Survey, Coastal and Marine Geology Program
https://doi.org/10.3133/ofr03320
https://pubs.usgs.gov/of/2003/of03-320/htmldocs/datacatalog.htm
https://pubs.usgs.gov/of/2003/of03-320/data/nav/2000/lm00_100sht.zip
David C. Twichell
VeeAnn A. Cross
Stephen D. Belew
2003
Mapping the floor of Lake Mead (Nevada and Arizona): Preliminary discussion and GIS data release
1.0
Open-File Report
03-320
Reston, VA
U.S. Geological Survey
https://pubs.usgs.gov/of/2003/of03-320/
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.
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.
20000601
20000606
ground condition
None planned
-114.876823
-114.737250
36.135924
36.081648
USGS Metadata Identifier
USGS:bb559c2d-262d-4756-91b7-3b9c871962e2
None
seismic
navigation
point
chirp
subbottom
Knudsen
shotpoint
U.S. Geological Survey
USGS
Coastal and Marine Geology Program
CMGP
Woods Hole Field Center
Open-File Report
OFR03-320
cruise serial number 00027
ISO 19115 Topic Category
inlandWaters
location
USGS Thesaurus
navigational data
geophysics
geospatial datasets
None
Nevada
Lake Mead
Hoover Dam
Boulder Basin
Mojave Desert
Las Vegas Wash
Las Vegas Bay
United States
North America
none
The U.S. Geological Survey must be referenced as the originator of the dataset in any future products or research derived from these data.
David C. Twichell
U.S. Geological Survey
Oceanographer
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
508-548-8700 x2266
508-457-2310
dtwichell@usgs.gov
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 3; ESRI ArcCatalog 8.2.0.700
H.E. Bevans
S.L. Goodbred
J.F. Miesner
S.A. Watkins
T.S. Gross
N.D. Denslow
T. Choeb
1996
Synthetic organic compounds and carp endrocrinology and histology, Las Vegas Wash and Las Vegas and Callville bays of Lake Mead Nevada
Water-Resources Investigations
96-4266
Reston, VA
U.S. Geological Survey
H.E. Bevans
M.S. Lico
S.J. Lawrence
1998
Water quality in the Las Vegas Valley area and the Carson and Truckee River basins, Nevada and California, 1992-1996
Circular
1170
Reston, VA
U.S. Geological Survey
K.J. Couvay
T.J. Leiker
1998
Synthetic organic compounds in water and bottom sediment from streams, detention basins, and sewage-treatment plant outfalls in Las Vegas Valley, Nevada, 1997
Open-File Report
98-633
Reston, VA
U.S. Geological Survey
V.A. Cross
D.C. Twichell
2003
Archive of Seismic-Reflection Data Collected During USGS Cruise Lake Mead 00027 in Lake Mead - Nevada, 1-6 June, 2000
Open-File Report
03-004
Reston, VA
U.S. Geological Survey
H.R. Gould
1951
Some quantitative aspects of Lake Mead turbidity currents
SEPM Special Publication
No. 2
Tulsa, OK
Society of Economic Paleontologists and Mineralogists
J.F. LaBounty
M.J. Horn
1997
The influence of drainage from the Las Vegas Valley on the limnology of Boulder Basin, Lake Mead, Arizona-Nevada
Journal of Lake and Reservoir Management
v. 13
L.J. Paulson
1981
Nutrient management with hydroelectric dams on the Colorado River
Technical Report
#8
Department of Biological Sciences, University of Nevada, Las Vegas, Nevada
Lake Mead Limnological Research Center
A.M. Preissler
G.A. Roach
K.A. Thomas
J.W. Wilson
1998
Water resources data, Nevada, water year 1998
Water Resources Data Nevada
NV-98-1
Reston, VA
U.S. Geological Survey
These data have been checked to remove obviously erroneous data points.
These data represent shotpoint navigation for all the chirp seismic lines collected on this cruise.
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.
unknown
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.
Evenden, 1990, Cartographic Projection Procedures for the UNIX Environment -- A User's Manual: Open-file Report 90-284
unknown
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.
unknown
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.
unknown
These points were then imported into ArcView and saved as a shapefile.
unknown
These UTM shapefiles were then reprojected to the Geographic Coordinate system using ArcToolbox in ArcGIS 8.1
unknown
Edits to the metadata were made to fix any errors that MP v 2.9.36 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). Added online links to the data in the identification section and the distribution section and also a link to the larger work citation. Added ISO 19115 Topic Category keywords. The standard order process section in the Distribution section was incomplete and had to be modified to meet the standard. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent.
20170329
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
USGS Thesaurus keywords added to the keyword section.
20180720
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Crossref DOI link was added as the first link in the metadata.
20191118
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Added keywords section with USGS persistent identifier as theme keyword.
20200908
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Vector
Entity point
1614
0.0001
0.0001
Decimal degrees
D_WGS_1984
WGS_1984
6378137.000000
298.257224
lm00_100sht
ArcView shapefile attribute table
ESRI
FID
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
Shape
Feature geometry.
ESRI
Coordinates defining the features.
EASTING
The UTM easting position of the shot point.
software generated
692808
716830
meters
NORTHING
The UTM northing position of the shot point.
software generated.
3988421
4002759
meters
LINENUM
Line number assigned to the seismic line along which the shotpoint navigatin point falls.
data processor
character set
SHOT
The seismic shot number corresponding to that point.
software computed
1
7061
David C. Twichell
U.S. Geological Survey
Oceanographer
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
508-548-8700 x2266
508-457-2310
dtwichell@usgs.gov
Downloadable Data
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.
shapefile
0.165
https://pubs.usgs.gov/of/2003/of03-320/data/nav/2000/lm00_100sht.zip
none
20240318
VeeAnn A. Cross
U.S. Geological Survey
Marine Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
whsc_data_contact@usgs.gov
The metadata contact email address is a generic address in the event the person is no longer with USGS. (updated on 20240318)
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
none
none