Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 2003 Title: Geophysical Surveys of Bear Lake, Utah-Idaho, September 2002 - Sound Velocity Profiles Geospatial_Data_Presentation_Form: tabular digital data Description: Abstract: Bear Lake is a tectonic lake that has existed for at least several hundred thousand years. The lake basin is a relatively simple half graben, a spoon-shaped depression tilted toward the main fault on the east side of the lake. The U.S. Geological Survey, in cooperation with researchers from several universities, has been studying the sediments of Bear Lake since 1996. The general purpose of this effort is to reconstruct past limnological conditions and regional climate on a range of timescales, from hundreds of years to hundreds of thousands of years. This research relates to a variety of human concerns, including water usage in the Bear River basin. Past work has included several coring operations, a seismic-reflection survey, sediment-trap deployments, a barge-mounted drilling operation with the GLAD800 drill rig, and a variety of other studies. The objectives of the September, 2002 operations, preliminarily reported here, were (1) to compile a detailed bathymetric map of the lake using swath-mapping techniques, in order to provide baseline data for a variety of applications and studies, and (2) to complete a sidescan-sonar survey of the lake, providing a nearly complete acoustic image of the lake floor. Limited amounts of subbottom acoustic-reflection data (CHIRP) were also collected, along with samples of lake-floor sediments representative of different kinds of backscatter patterns. These surveys followed an earlier subbottom acoustic-reflection survey (1997), using boomer and 3.5 kHz systems (S. M. Colman, unpublished data). Purpose: Sound velocity profiles were collected in order to map the sound velocity profile of the water column. The interferometric sonar systems acquires high-resolution bathymetric measurements in a swath. However, changes in the sound velocity profile with depth will affect the acousit ray path. The acoustic ray path must be accurately modeled in order to calculate accurate depth and position of individual soundings. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20020904 Ending_Date: 20020916 Currentness_Reference: Ground Condition Status: Progress: Complete Maintenance_and_Update_Frequency: none planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -111.5 East_Bounding_Coordinate: -111.17 North_Bounding_Coordinate: 42.2 South_Bounding_Coordinate: 41.08 Keywords: Theme: Theme_Keyword_Thesaurus: none Theme_Keyword: Sound Velocity Profiles Theme_Keyword: CTD Theme_Keyword: salinity Theme_Keyword: water temperature Theme_Keyword: conductivity 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 Place: Place_Keyword_Thesaurus: none Place_Keyword: Bear Lake Place_Keyword: Utah Place_Keyword: Idaho Place_Keyword: North America Place_Keyword: United States Access_Constraints: none Use_Constraints: The USGS asks to be referenced in any use of these data. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Jane F. Denny Contact_Position: Geologist, Seafloor Mapping Group Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 012543 Country: USA Contact_Voice_Telephone: 508-457-2311 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: jdenny@usgs.gov Hours_of_Service: Monday-Friday, 8am-5pm, Eastern Standard Time Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Attribute data are location data. These locations are accurate within 3 meters (recorded WAAS horizontal accuracy). Logical_Consistency_Report: These data were all acquired with a Applied Microsystems Sound Velocity Profiler deployed off of the same platform. These data were collected throughout the survey area. Completeness_Report: These data are known to be complete. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: WAAS is assumed to be accurate within 1-2 meters. Standard GPS is assumed accurate within 5-10 meters. All data were recorded using the WAAS (Wide Area Augmentation System) navigation. All WAAS data are referenced to WGS84. All sample locations are assumed to be accurate to +/- 3 meters. Lineage: Process_Step: Process_Description: Sound Velocity profiles were collected throughout the study area to map the velocity structure of the water column. Changes in the speed of sound throughout the water column will affect the swath bathymetric data; outer beams will experience refraction. The SVP was deployed and sent to the lake floor. Upon retrieval, data were downloaded and placed into a Mircosoft Excel spreadsheet. The data were exported from the Excel spreadsheet to a text file. The USGS Mapgen PROJ command was used to convert latitude and longitude values to eastings and northings (UTM Zone 12, WGS84 ellipsoid). This file was imported into ArcView as a table. The table was then converted to a shapefile. Process_Date: 2003 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jane F. Denny Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543 Country: USA Contact_Voice_Telephone: 508-457-2311 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: jdenny@usgs.gov Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: point Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.000089992 Longitude_Resolution: 0.000089992 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: WGS84 Ellipsoid_Name: WGS84 Semi-major_Axis: 6378137.0000000 Denominator_of_Flattening_Ratio: 298.26 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: svp.shp Entity_Type_Definition: Arcview shapefile Entity_Type_Definition_Source: ESRI Attribute: Attribute_Label: Shape Attribute_Definition: Feature geometry. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: point Enumerated_Domain_Value_Definition: feature geometry name Enumerated_Domain_Value_Definition_Source: Arcview Attribute: Attribute_Label: Longitude Attribute_Definition: x coordinate of feature Attribute_Definition_Source: ESRI Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -111.5 Range_Domain_Maximum: -111.17 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: Latitude Attribute_Definition: location of y coordinate Attribute_Definition_Source: ESRI Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 42.2 Range_Domain_Maximum: 41 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: Easting Attribute_Definition: location of X coordinate in UTM space Attribute_Definition_Source: ESRI Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 450000 Range_Domain_Maximum: 490000 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: Northing Attribute_Definition: location of Y coordinate in UTM space Attribute_Definition_Source: ESRI Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 4500000 Range_Domain_Maximum: 4700000 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: cast Attribute_Definition: Sample Identification Attribute_Definition_Source: USGS Attribute_Domain_Values: Codeset_Domain: Codeset_Name: Cast Codeset_Source: USGS Attribute: Attribute_Label: Date Attribute_Definition: Date sample was collected Attribute_Definition_Source: Calendar Date Attribute_Domain_Values: Unrepresentable_Domain: Date Attribute: Attribute_Label: Time Attribute_Definition: Time the sample was collected Attribute_Definition_Source: USGS Attribute_Domain_Values: Unrepresentable_Domain: time Attribute: Attribute_Label: Depth Attribute_Definition: Water depth at sample location Attribute_Definition_Source: Fathometer Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 5 meters Range_Domain_Maximum: 65 meters Metadata_Reference_Information: Metadata_Date: 20030425 Metadata_Review_Date: 2003 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jane F. Denny Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543 Country: USA Contact_Voice_Telephone: 508-457-2311 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: jdenny@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Access_Constraints: None Metadata_Use_Constraints: None Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Jane F. Denny Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543 Country: USA Contact_Voice_Telephone: 508-457-2311 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: jdenny@usgs.gov Resource_Description: JPG Images of Grab Samples Distribution_Liability: Altough this data set and its lineage have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or it's related materials. The act of distribution shall not constitute any such warranty, and no resposibility is assumed by the USGS in the use of these data or related items. Users must assume resposibility for the proper use of this data. This data should not be used at resolutions for which it is not intended. This data has no been reviewed for conformity with U.S. Geological Survey editorial standards, or the North American Strigraphic code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the US Government.