U.S. Geological Survey
2018
Seismic Reflection, EdgeTech SB-424 chirp tracklines collected within Lake Powell, UT-AZ during USGS field activity 2017-049-FA, (Esri polyline shapefile, GCS WGS 84)
1.0
vector digital data
data release
DOI:10.5066/P90BU2VS
Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts
U.S. Geological Survey, Coastal and Marine Geology Program
https://doi.org/10.5066/P90BU2VS
https://www.sciencebase.gov/catalog/item/5b9155e0e4b0702d0e8087dd
Brian D. Andrews
Wayne E. Baldwin
Charles R. Worley
Robert L. Baskin
Jane F. Denny
David S. Foster
Barry J. Irwin
Eric M. Moore
Alex R. Nichols
2018
High-resolution geophysical data collected in Lake Powell Utah-Arizona, U.S. Geological Survey Field Activity 2017-049-FA
1.0
data release
DOI:10.5066/P90BU2VS
Reston, VA
U.S. Geological Survey
Suggested citation: Andrews, B.D., Baldwin, W.E., Worley, C.R., Baskin, R.L., Denny, J.F., Foster, D.S., Irwin, B.J., Moore, E.M., and Nichols, A.R., 2018, High-resolution geophysical data collected in Lake Powell, Utah-Arizona, U.S. Geological Survey Field Activity 2017-049-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P90BU2VS.
https://doi.org/10.5066/P90BU2VS
https://www.sciencebase.gov/catalog/item/5b900656e4b0702d0e807395
High-resolution geophysical mapping of Lake Powell in the Glen Canyon National Recreation Area in Utah and Arizona was conducted between October 8 and November 15, 2017, as part of a collaborative effort between the U.S. Geological Survey and the Bureau of Reclamation to provide high-quality data needed to reassess the area-capacity tables for the Lake Powell reservoir. Seismic data collected during this survey can help to define the rates of deposition within the San Juan and Colorado Rivers, which are the main inflows to Lake Powell. These new data are intended to improve water budget management decisions that affect the natural and recreational resources of the reservoir. Multibeam echosounder bathymetry and backscatter data were collected along 2,312 kilometers of tracklines (331 square kilometers) of the lake floor to regionally define its depth and morphology, as well as the character and distribution of lake-floor sediments. Ninety-two kilometers of seismic-reflection profile data were also collected to define the thickness and structure of sediment deposits near the confluences of the San Juan and Colorado Rivers.
This dataset contains trackline navigation for approximately 92 km of chirp seismic-reflection data collected by the U.S. Geological Survey during cruise 2017-049-FA along the San Juan Arm and Good Hope Bay to Hite sections of Lake Powell in the Glen Canyon National Recreation Area. This information allows for spatial correlation of chirp seismic-reflection profiles images with other geophysical and sample data for investigating lake-floor morphology and stratigraphy in the area.
Additional information on the field activity is available from https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-049-FA.
20171012
20171017
ground condition
None planned
-110.892381
-110.427431
37.834931
37.162164
USGS Metadata Identifier
USGS:5b9155e0e4b0702d0e8087dd
None
U.S. Geological Survey
USGS
Woods Hole Coastal and Marine Science Center
WHCMSC
Coastal and Marine Geology Program
CMGP
WHCMSC
Utah Water Science Center
UWSC
Bureau of Reclamation
BOR
National Park Service
NPS
Department of the Interior
DOI
Colorado River Storage Project
CRSP
field activity number 2017-049-FA
R/V Stephens
shapefile
trackline navigation
seismic navigation
seismic reflection
seismic profile
chirp
Edgetech
SB-424
Lacustrine Geology
ISO 19115 Topic Category
location
geoscientificInformation
inlandWaters
USGS Thesaurus
seismic reflection methods
geophysics
geology
navigational data
geospatial datasets
None
United States of America
State of Utah
State of Arizona
Garfield County
San Juan County
Kane County
Coconino County
Lake Powell
Glen Canyon National Recreation Area
Glen Canyon
Colorado River
Great Bend
San Juan River
Escalante River
Hite
Good Hope Bay
Bullfrog
Bullfrog Bay
Halls Crossing
Halls Bay
Rainbow Bridge National Monument
Dangling Rope
Rock Creek Bay
Friendship Bay
Last Chance Bay
Padre Bay
Gunsight Bay
Warm Creek Bay
Wahweap
Wahweap Bay
Antelope Canyon
Navajo Canyon
Page
Glen Canyon Dam
None
lake floor
lakefloor
none
2017
None
Public domain data from the U.S. Government are freely re-distributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset.
U.S. Geological Survey
Brian Andrews
Geographer
mailing and physical
384 Woods Hole Road
Woods Hole
Massachusetts
02543-1598
US
508-548-8700 x2348
508-457-2310
bandrews@usgs.gov
https://www.sciencebase.gov/catalog/file/get/5b9155e0e4b0702d0e8087dd?name=2017-049-FA_Edgetech424_Tracklines_browse.jpg
Thumbnail image of chirp seismic-reflection tracklines from Lake Powell, UT-AZ.
JPEG
Chirp seismic-reflection profile data were collected continuously along the San Juan River between 16:35 and 22:47 (UTC) on 10/12/17 (JD285) and the Colorado River between 15:52 and 19:07 on 10/17/17 (JD290). Line numbering in the San Juan section begins with l1f1.001 and ends with l1f5.001. Line numbering in the Colorado section begins with l2f1 and ends with l2f2.001. The attribute field 'ImageName' lists the PNG profile image included in "2017-049-FA_Edgetech424_Images.zip" (available from the larger work citation) that corresponds to each line feature. One image exists for each feature. Seismic profiling was conducted only at these locations to investigate sediment accumulation near the confluences of the rivers with Lake Powell.
Sections of tracklines where navigation was recorded but no seismic data were logged are not included such as during testing, some turns, and very short files. There is no line l1f1.
The EdgeTech SB-424 subbottom profiler was towed from a port side davit on the R/V Stephens with the transducer approximately 1 m below the water line, and 2.8 meters astern of the DGPS antenna mounted atop the port side of the cabin. Navigation data for the SB-424 were collected using a Hemisphere Differential GPS (DGPS) receiver. Positioning data were recorded using Edgetech Discover Sub-Bottom (version 4.04) acquisition software, which logged positioning coordinates to individual trace headers SEG-Y format. DGPS horizontal positional accuracy is assumed to be within 2 m; the layback position of the transducer relative to the DGPS antenna was accounted for during processing.
U.S. Geological Survey
unpublished material
SB-424 trackline data
vector digital data
disc
20171012
20171017
ground condition
SEG-Y SB-424 data
Chirp seismic data were collected using an EdgeTech 3100 portable sub-bottom profiling system and an SB-424 towfish (4-24 kHz), which was towed from a port side davit on the R/V Stephens with the transducer approximately 1 m below the water line, and 2.8 meters astern of the DGPS antenna mounted atop the port side of the cabin. Edgetech Discover Sub-Bottom (version 4.04) seismic acquisition software was used to control the 3100 topside unit, digitally log trace data in the SEG-Y Rev. 1 format (IEEE floating point), and record GPS navigation coordinates to the SEG-Y trace headers (in arc seconds of Latitude and Longitude, multiplied by a scalar of 100). Data were acquired using a 250 milliseconds (ms) shot rate, a 10-ms pulse length, and a 4 to 20 kHz frequency sweep. Traces were recorded with a 23-microsecond sample interval over lengths of approximately 236 ms.
PROCESS STEP 1:
SIOSEIS (version 2015.3.1), OpenCPS (version 3.3.0), and Seismic Unix (version 4.2) were used to process SEG-Y data, create navigation files, and plot images. The processing flow and scripts used to produce navigation files including trackline shapefiles are summarized below and in the following processing steps.
1) SIOSEIS was used to read the raw SEG-Y files, extract the envelope-detected trace, renumber shots starting from one, and write out new SEG-Y files.
2) OpenCPS was use to run the following flows:
A) read_segy.flow - SegyTapeRead read the traces. HeaderMath and UTMLatLong were used to convert the source lat/lon positions from seconds of arc to decimal degrees, project them to UTM Zone 12N WGS 84 meters, and write each to new header words (NRP_LAT, NRP_LON, NRP_X, and NRP_Y). DBWrite wrote the UTM positions for the first channel of each FFID to an internal OpenCPS database table. Finally, Output wrote the traces to a new file "*.sht-raw.seis" in the internal OpenCPS format.
B) layback_shift.flow - Input read the "*.sht-raw.seis" file and sorted the traces to FFID/CHANNEL. The custom Python module ShotlineLayback (developed by Nathan Miller of USGS-WHCMSC) was used to define the measured horizontal offset between the DGPS antenna and the SB-424 transducer (-2.8 m). The algorithm interpolated a sail line from the source shot positions (NRP_X and NRP_Y), then computed layback positions for the SB-424 shots by translating them back along the sail by the measured offset. ApplyStatic was used to shift the traces down by 1.35 ms to account for the approximate 1 m tow depth of the SB-424 (the sound speed of 1480 m/s, a typical value observed from SVP profiles during the survey, was used to convert the depth in meters to 1-way travel time in ms). Output wrote the shifted traces to a new SEG-Y files in which the trace header words SRC_X, SRC_Y represent the calculated layback coordinates, and REC_X, REC_Y maintain the original DGPS coordinates.
3) The SIOSEIS script Read424 was used to read layback and static corrected SEG-Y files, write a Seismic Unix file, and extract SEG-Y trace header information, including shot number, pre-layback and layback longitude and latitude, year, Julian day, and time of day (UTC). Header information from each SEG-Y file was saved to text files after an AWK (no version) filter was used to maintain the first and last shots, shots at multiples of 100, 500, and shots with unique navigation coordinates. Geographic coordinates (WGS 84) were converted to UTM zone 12 N coordinates (WGS 84) using Proj (version 4.6.0). End shots and shots at multiples of 100 may not have unique navigation coordinates. Separate text files containing the first and last shots and even 500 shot intervals were also saved. A 500 shot interval was chosen because it corresponds to the annotation interval provided along the top of the seismic-reflection profile images. Read424 called a Python script 424toSQL17049.py, written by Wayne Baldwin, which imported the CSV files to a Spatialite (version 4.3.0) enabled SQLite (version 3.21.0) database, creating two tables containing point geometries for the unique and 500 shot interval navigation. The script also created line geometries from the unique navigation (sorted by LineName and Shot) and wrote them to an additional database table. The tracklines are based on all the shot navigation.
These process steps and all subsequent process steps were conducted by the same person - Wayne Baldwin.
201806
U.S. Geological Survey
Wayne E. Baldwin
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
(508) 548-8700 x2226
(508) 457-2310
wbaldwin@usgs.gov
PROCESS STEP 2:
The SB-424 trackline features were added (Add Data) into ArcMap (version 10.3.1) from the SQLite database, then exported (Right click on database feature class >Data> Export Data) to the new Esri polyline shapefile 2017-049-FA_Edgetech424_Tracklines.shp
201806
PROCESS STEP 3:
XTools Pro (version 12.0) for ArcGIS desktop (version 10.3) was used (TABLE OPERATIONS - TABLE RESTRUCTURE) to rename the table attribute heading 'Shot_init' to 'Shot_ini' in the polyline shapefile's attribute table. All other attribute headings were left unchanged.
201806
Added keywords section with USGS persistent identifier as theme keyword.
20200806
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
string
10
0.000001
0.000001
Decimal degrees
WGS 1984
WGS 84
6378137.0
298.257224
2017-049-FA_Edgetech424_Tracklines
SB-424 tracklines for survey 2017-049-FA in Lake Powell, AZ-UT.
U.S. Geological Survey
FID
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Feature geometry.
Esri
Coordinates defining the features.
LineName
Name of the trackline along which seismic-reflection data were collected in the format: LineNumberFileNumber (i.e.'l1f1.001').
U.S. Geological Survey
Character set
ImageName
PNG image name of seismic-reflection profile corresponding to survey line.
U.S. Geological Survey
Character set
Shot_ini
Shot number at the start of the survey line.
U.S. Geological Survey
1
1
shot
1
Shot_end
Shot number at the end of the survey line.
U.S. Geological Survey
1038
24188
shot
1
Year
Calendar year the data were collected
U.S. Geological Survey
Character set
JD_UTC_ini
Julian day and UTC time at the start of the survey line in the format: JD:HH:MM:SS; Julian day is the integer number (although recorded here in text string format) representing the interval of time in days since January 1 of the year of collection.
U.S. Geological Survey
Character set
JD_UTC_end
Julian day and UTC time at the end of the survey line in the format: JD:HH:MM:SS; Julian day is the integer number (although recorded here in text string format) representing the interval of time in days since January 1 of the year of collection.
U.S. Geological Survey
Character set
SurveyID
WHCMSC field activity identifier (e.g. "2017-049-FA" where 2017 is the survey year, 049 is survey number of that year, and FA is Field Activity).
U.S. Geological Survey
Character set
DeviceID
Sonar device used to collect seismic-reflection data.
U.S. Geological Survey
Character set
VehicleID
Survey vessel name.
U.S. Geological Survey
Character set
Length_km
Length of seismic-reflection data line in kilometers (UTM Zone 12N, WGS 84) calculated in the SQLite database.
U.S. Geological Survey
0.70
18.13
kilometers
0.01
Each polyline feature in this shapefile can be hyperlinked to a corresponding PNG image in ArcGIS (see the 2017-049-FA_Edgetech424_Images.zip archive accompanying 2017-049-FA_Edgetech424_Images_meta.xml available from the larger work citation). The fist, last, and multiple of 500 shot features in 2017-049-FA_Edgetech424_500sht.shp (available from the larger work citation) correspond to the x-axis ticks on the PNG images.
U.S. Geological Survey
U.S. Geological Survey - ScienceBase
mailing and physical address
Denver Federal Center
Building 810
Mail Stop 302
Denver
CO
80225
1-888-275-8747
sciencebase@usgs.gov
USGS data release 2017-049-FA seismic-reflection trackline data from Lake Powell, AZ-UT: includes the shapefile 2017-049-FA_Edgetech424_Tracklines.shp, the browse graphic 2017-049-FA_Edgetech424_Tracklines_browse.jpg, and Federal Geographic Data Committee (FGDC) Content Standards for Digital Geospatial Metadata (CSDGM) metadata file 2017-049-FA_Edgetech424_Tracklines_meta.xml.
Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Shapefile
ArcMap 10.3.1
Shapefile
Shapefile of seismic-reflection tracklines collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center in Lake Powell AZ-UT and the associated metadata.
none
0.3
https://www.sciencebase.gov/catalog/item/5b9155e0e4b0702d0e8087dd
https://www.sciencebase.gov/catalog/file/get/5b9155e0e4b0702d0e8087dd
https://doi.org/10.5066/P90BU2VS
The first link is to the page containing the data, the second link downloads all data available from the page as a zip file, and the third link is to the publication landing page.
WMS
Shapefile 2017-049-FA_Edgetech424_Tracklines.shp provided through a WMS (web mapping service).
https://www.sciencebase.gov/catalogMaps/mapping/ows/5b9155e0e4b0702d0e8087dd?service=wms&request=getcapabilities&version=1.3.0
https://www.sciencebase.gov/catalog/item/5b9155e0e4b0702d0e8087dd
https://doi.org/10.5066/P90BU2VS
The first link in the network resources accesses the data through a mapping service, the second is to the page containing the data, and the third link is to the publication landing page.
none
To utilize these data, the user must have software capable of reading shapefile format, or GIS software capable of utilizing web mapping or feature services.
20200806
U.S. Geological Survey
Wayne E. Baldwin
Geologist
mailing and physical
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
(508) 548-8700 x2226
(508) 457-2310
wbaldwin@usgs.gov
FGDC Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998
local time