Identification_Information: Citation: Citation_Information: Originator: Jane F. Denny Publication_Date: 2002 Title: Geophysical Surveys of Bear Lake, Utah-Idaho, September 2002 - Seismic Navigation: Start of Line Geospatial_Data_Presentation_Form: digital vector data Publication_Information: Publication_Place: Woods Hole, MA Publisher: U.S. Geological Survey 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followed an earlier subbottom acoustic-reflection survey (1997), using boomer and 3.5 kHz systems (S. M. Colman, unpublished data).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: These data represent the first shot point for each line of data acquired with various seismic-reflection systems utilized during U.S. Geological Survey geophysical research cruises. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20020904 Ending_Date: 20020916 Currentness_Reference: Publication Date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -111.5 East_Bounding_Coordinate: -111.2 North_Bounding_Coordinate: 42.2 South_Bounding_Coordinate: 41.08 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: seismic reflection Theme_Keyword: SEG-Y Theme_Keyword: Chirp Theme_Keyword: shot point Theme_Keyword: navigation 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 U.S. Geological Survey must be referenced as the originator of the dataset in any future publications. Point_of_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 Native_Data_Set_Environment: ArcView version 3.2 shapefile format Data_Quality_Information: Logical_Consistency_Report: These navigation data have been stripped from the header of seismic SEG-Y data. They have been quality checked by comparing these data to navigation data acquired during cruise operations. Completeness_Report: Complete Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: WAAS (Wide Area Augmentation System) Navigation was used to acquire navigation information. WAAS is considered to have a horizontal accuracy of < 3 meters. The chirp tow-vehicle was towed at the surface, next to the vessel. WAAS positioning was recorded in the SEGY header of the seismic data. Navigation of the seismic tow-vehicle is assumed to be +/- 3 meters. Lineage: Process_Step: Process_Description: The seismic shot navigation is received by the differential GPS system (WAAS), sent directly to the seismic acquisition system, and recorded in the SEG-Y header of each file. The navigation is later extracted from the SEG-Y header, the first shot point is extracted, converted from its native UTM projection (zone 12, units meters, WGS84 datum) to Geographic Coordinate System, and formatted into a comma-delimited ASCII file. This file is imported into ArcView 3.2 as a table. The table is then converted into a point 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 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: Assumed sea level Altitude_Resolution: 1 Altitude_Distance_Units: Two-way travel time Altitude_Encoding_Method: Attribute values Depth_System_Definition: Depth_Datum_Name: Local surface Depth_Resolution: 1 Depth_Distance_Units: Meters Depth_Encoding_Method: Attribute values Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: Seismic Shot Point Navigation Entity_Type_Definition: Shapefile Attribute Table Entity_Type_Definition_Source: ArcView 3.2 Attribute: Attribute_Label: Shape Attribute_Definition: internal ArcView 3.2 ID Attribute_Definition_Source: ArcView 3.2 Attribute_Domain_Values: Unrepresentable_Domain: ArcView 3.2 Attribute: Attribute_Label: Lon Attribute_Definition: X coordinate in Geographic Coordinate System Attribute_Definition_Source: Geographic Coordinate System Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -111.5 Range_Domain_Maximum: -111.17 Attribute: Attribute_Label: Lat Attribute_Definition: y-Coordinate in Geographic Coordinate System Attribute_Definition_Source: Geographic Coordinate System Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 41.08 Range_Domain_Maximum: 42.2 Attribute: Attribute_Label: Line Attribute_Definition: Line Number Attribute_Definition_Source: data set Attribute_Domain_Values: Unrepresentable_Domain: Line Number Attribute: Attribute_Label: Shot Attribute_Definition: Shot Point Number Attribute_Definition_Source: data set Attribute_Domain_Values: Unrepresentable_Domain: Shot Point Number Attribute: Attribute_Label: UTMX Attribute_Definition: X Coordinate; UTM, Zone 12 Attribute_Definition_Source: data set Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 450000 Range_Domain_Maximum: 480000 Attribute: Attribute_Label: UTMY Attribute_Definition: Y-Coordinate; UTM, Zone 12 Attribute_Definition_Source: data set Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 4500000 Range_Domain_Maximum: 4700000 Attribute: Attribute_Label: Year Attribute_Definition: Calendar Date Attribute_Definition_Source: Calendar Attribute_Domain_Values: Unrepresentable_Domain: Calendar Date Attribute: Attribute_Label: JD_HR_MIN_ Attribute_Definition: Time - Julian Day, Hour, Minute, Second Attribute_Definition_Source: Calendar Date Attribute_Domain_Values: Unrepresentable_Domain: Calendar Date Distribution_Information: Distribution_Liability: This publication was 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 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 on this CD-ROM 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. 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 Metadata_Reference_Information: Metadata_Date: 20020119 Metadata_Review_Date: 2002 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