Metadata: Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 2018 Title: Seismic Reflection, EdgeTech SB-424 chirp profile images collected within Lake Powell, UT-AZ during USGS field activity 2017-049-FA (PNG images). Edition: 1.0 Geospatial_Data_Presentation_Form: raster digital data Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P90BU2VS Publication_Information: Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: https://doi.org/10.5066/P90BU2VS Online_Linkage: https://www.sciencebase.gov/catalog/item/5b96a5cce4b0702d0e826bf1 Larger_Work_Citation: Citation_Information: Originator: Brian D. Andrews Originator: Wayne E. Baldwin Originator: Charles R. Worley Originator: Robert L. Baskin Originator: Jane F. Denny Originator: David S. Foster Originator: Barry J. Irwin Originator: Eric M. Moore Originator: Alex R. Nichols Publication_Date: 2018 Title: High-resolution geophysical data collected in Lake Powell Utah-Arizona, U.S. Geological Survey Field Activity 2017-049-FA Edition: 1.0 Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P90BU2VS Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: 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. Online_Linkage: https://doi.org/10.5066/P90BU2VS Online_Linkage: https://www.sciencebase.gov/catalog/item/5b900656e4b0702d0e807395 Description: Abstract: 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. Purpose: These PNG images represent approximately 92 km of chirp seismic-reflection data collected by the U.S. Geological Survey during survey 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. Images of each seismic profile were generated in order to provide portable and easily viewable alternatives to the SEGY versions of the data. Each profile image can be hotlinked to its corresponding trackline navigation contained within the Esri polyline shapefile '2017-049-FA_Edgetech424_Tracklines.shp'. Shotpoint index marks along the top of the PNG images correlate to the positions of 500 shot intervals within the Esri point shapefile '2017-049-FA_Edgetech424_500sht.shp'. Supplemental_Information: Additional information on the field activity is available from https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-049-FA. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20171012 Ending_Date: 20171017 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -110.892381 East_Bounding_Coordinate: -110.427431 North_Bounding_Coordinate: 37.834931 South_Bounding_Coordinate: 37.162164 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:5b96a5cce4b0702d0e826bf1 Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Woods Hole Coastal and Marine Science Center Theme_Keyword: WHCMSC Theme_Keyword: Coastal and Marine Geology Program Theme_Keyword: CMGP Theme_Keyword: WHCMSC Theme_Keyword: Utah Water Science Center Theme_Keyword: UWSC Theme_Keyword: Bureau of Reclamation Theme_Keyword: BOR Theme_Keyword: National Park Service Theme_Keyword: NPS Theme_Keyword: Department of the Interior Theme_Keyword: DOI Theme_Keyword: Colorado River Storage Project Theme_Keyword: CRSP Theme_Keyword: field activity number 2017-049-FA Theme_Keyword: R/V Stephens Theme_Keyword: shapefile Theme_Keyword: trackline navigation Theme_Keyword: seismic navigation Theme_Keyword: seismic reflection Theme_Keyword: seismic profile Theme_Keyword: chirp Theme_Keyword: Edgetech Theme_Keyword: SB-424 Theme_Keyword: image Theme_Keyword: PNG Theme_Keyword: Lacustrine Geology Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: location Theme_Keyword: geoscientificInformation Theme_Keyword: inlandWaters Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: seismic reflection methods Theme_Keyword: sub-bottom profiling Theme_Keyword: geophysics Theme_Keyword: geology Place: Place_Keyword_Thesaurus: None Place_Keyword: United States of America Place_Keyword: State of Utah Place_Keyword: State of Arizona Place_Keyword: Garfield County Place_Keyword: San Juan County Place_Keyword: Kane County Place_Keyword: Coconino County Place_Keyword: Lake Powell Place_Keyword: Glen Canyon National Recreation Area Place_Keyword: Glen Canyon Place_Keyword: Colorado River Place_Keyword: Great Bend Place_Keyword: San Juan River Place_Keyword: Escalante River Place_Keyword: Hite Place_Keyword: Good Hope Bay Place_Keyword: Bullfrog Place_Keyword: Bullfrog Bay Place_Keyword: Halls Crossing Place_Keyword: Halls Bay Place_Keyword: Rainbow Bridge National Monument Place_Keyword: Dangling Rope Place_Keyword: Rock Creek Bay Place_Keyword: Friendship Bay Place_Keyword: Last Chance Bay Place_Keyword: Padre Bay Place_Keyword: Gunsight Bay Place_Keyword: Warm Creek Bay Place_Keyword: Wahweap Place_Keyword: Wahweap Bay Place_Keyword: Antelope Canyon Place_Keyword: Navajo Canyon Place_Keyword: Page Place_Keyword: Glen Canyon Dam Stratum: Stratum_Keyword_Thesaurus: None Stratum_Keyword: lake floor Stratum_Keyword: lakefloor Temporal: Temporal_Keyword_Thesaurus: none Temporal_Keyword: 2017 Access_Constraints: None Use_Constraints: 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. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Brian Andrews Contact_Position: Geographer Contact_Address: Address_Type: mailing and physical Address: 384 Woods Hole Road City: Woods Hole State_or_Province: Massachusetts Postal_Code: 02543-1598 Country: US Contact_Voice_Telephone: 508-548-8700 x2348 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: bandrews@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: https://www.sciencebase.gov/catalog/file/get/5b96a5cce4b0702d0e826bf1?name=2017-049-FA_Edgetech424_Images_browse.jpg Browse_Graphic_File_Description: Thumbnail image of chirp seismic-reflection profile example from Lake Powell, UT-AZ. Browse_Graphic_File_Type: JPEG Data_Quality_Information: Logical_Consistency_Report: Processed seismic data were converted to PNG format for ease of seismic trace display. Quality control was conducted during processing. Completeness_Report: 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. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Although navigation is not stored in the images, positional accuracy is relevant to the accuracy of these data. 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. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: Unpublished Material Title: SB-424 PNG image data Geospatial_Data_Presentation_Form: raster digital data Type_of_Source_Media: disc Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20171012 Ending_Date: 20171017 Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: SEG-Y SB-424 data Source_Contribution: 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: Process_Description: 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 2-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. 4) The Seismic Unix script Plot424 creates 12-inch-high variable density plots of the seismic profiles, which are converted to PNG format using ImageMagick (version 6.9.5-4). Images show two-way travel time (seconds) along the y-axis (left margin) and shots along profile (labeled at 500 shot intervals) on the x-axis (along top of profile). Process_Date: 201806 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Wayne E. Baldwin 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 x2226 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: wbaldwin@usgs.gov Process_Step: Process_Description: Added keywords section with USGS persistent identifier as theme keyword. Process_Date: 20200806 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: VeeAnn A. Cross Contact_Position: Marine Geologist Contact_Address: Address_Type: Mailing and Physical Address: 384 Woods Hole Road 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 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Pixel Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: The PNG seismic reflection images can be hyperlinked to their corresponding trackline or shotpoint locations in ArcGIS using the shapefiles '2017-049-FA_Edgetech424_Tracklines.shp' or '2017-049-FA_Edgetech424_500sht.shp', respectively (available from the larger work citation). The images show two-way travel time (seconds) on the y-axis and distance along profile (annotation at 500 shot intervals) on the x-axis. Entity_and_Attribute_Detail_Citation: U.S. Geological Survey Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey - ScienceBase Contact_Address: Address_Type: mailing and physical address Address: Denver Federal Center Address: Building 810 Address: Mail Stop 302 City: Denver State_or_Province: CO Postal_Code: 80225 Contact_Voice_Telephone: 1-888-275-8747 Contact_Electronic_Mail_Address: sciencebase@usgs.gov Resource_Description: USGS data release 2017-049-FA SB-424 PNG imagery from Lake Powell AZ-UT includes the zip archive 2017-049-FA_Edgetech424_Images.zip containing 10 PNG images named according to line convention, the browse graphic 2017-049-FA_Edgetech424_Images_browse.jpg, and the Federal Geographic Data Committee (FGDC) Content Standards for Digital Geospatial Metadata (CSDGM) metadata file 2017-049-FA_Edgetech424_Images_meta.xml. Distribution_Liability: 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. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: PNG Format_Version_Number: ImageMagick (version 6.9.5-4) Format_Specification: Portable Network Graphic (PNG) Format_Information_Content: The 7zip (version 16.04) file contains seismic-reflection profile images of EdgeTech SB-424 collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center in Lake Powell and the associated metadata. File_Decompression_Technique: Use WinZip, 7zip, Peazip or pkUnzip Transfer_Size: 175 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/item/5b96a5cce4b0702d0e826bf1 Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/5b96a5cce4b0702d0e826bf1 Network_Resource_Name: https://doi.org/10.5066/P90BU2VS Access_Instructions: 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. Fees: none Technical_Prerequisites: These data can be viewed with any PNG image viewing software. The zip files must be uncompressed in order to view the images. Metadata_Reference_Information: Metadata_Date: 20200806 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Wayne E. Baldwin Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700 x2226 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: wbaldwin@usgs.gov Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time