Identification_Information: Citation: Citation_Information: Originator: David S. Foster Originator: VeeAnn A. Cross Publication_Date: 2005 Title: Chirp seismic shotpoint navigation every 500 shots in geographic coordinates - Lake Mohave survey 2002 Geospatial_Data_Presentation_Form: vector digital data Online_Linkage: http://pubs.usgs.gov/of/2004/1247/data/nav/seis500sht.zip Larger_Work_Citation: Citation_Information: Originator: VeeAnn A. Cross Originator: David S. Foster Originator: David C. Twichell Publication_Date: 2005 Title: Lake Mohave Geophysical Survey 2002: GIS Data Release Series_Information: Series_Name: Open-File Report Issue_Identification: 2004-1247 Publication_Information: Publication_Place: Woods Hole Science Center, Woods Hole, MA Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/of/2004/1247 Description: Abstract: Lake Mohave is one of several multi-purpose reservoirs that have been constructed on the Colorado River. The lake was formed upon completion of the Davis Dam in 1953. No mapping of the floor of the lake had been conducted since completion of the Davis Dam. The U.S. Geological Survey, in cooperation with researchers form the University of Nevada Las Vegas, completed a geophysical survey of this lake in April 2002. The survey included collection of sidescan sonar imagery of nearly the entire lake floor, and high-resolution seismic-reflection profiles along widely spaced lines throughout the lake. The detailed mapping of the lake floor was used to determine the amount of sediment that had accumulated in the lake since impoundment, its distribution, and the processes of deposition. Purpose: This shapefile is used to enable correlation between seismic-reflection profiles and the sidescan-sonar imagery, geologic interpretation, and other features represented on the lake floor. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20020418 Ending_Date: 20020428 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -114.711300 East_Bounding_Coordinate: -114.571067 North_Bounding_Coordinate: 35.868300 South_Bounding_Coordinate: 35.200633 Keywords: Theme: Theme_Keyword_Thesaurus: General Theme_Keyword: chirp Theme_Keyword: CMGP Theme_Keyword: Coastal and Marine Geology Program Theme_Keyword: Knudsen Theme_Keyword: lake Theme_Keyword: navigation Theme_Keyword: OF 2004-1247 Theme_Keyword: Open-File Report Theme_Keyword: point Theme_Keyword: reservoir Theme_Keyword: seismic Theme_Keyword: seismic-reflection Theme_Keyword: shapefile Theme_Keyword: shotpoint Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Woods Hole Science Center Theme_Keyword: field activity identifier H-1-02-SW Theme_Keyword: field activity serial number 02020 Place: Place_Keyword_Thesaurus: General Place_Keyword: Arizona Place_Keyword: Colorado River Place_Keyword: Davis Dam Place_Keyword: Hoover Dam Place_Keyword: Lake Mohave Place_Keyword: Las Vegas Place_Keyword: Mojave Desert Place_Keyword: Nelson's Landing Place_Keyword: Nevada 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 products or research derived from these data. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: David S. Foster 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 x2271 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: dfoster@usgs.gov Native_Data_Set_Environment: Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 8.2.0.700 Data_Quality_Information: Positional_Accuracy: Horizontal_Positional_Accuracy: Quantitative_Horizontal_Positional_Accuracy_Assessment: Horizontal_Positional_Accuracy_Value: 10 m Horizontal_Positional_Accuracy_Explanation: Navigation data were collected with a PLGR system. The nominal accuracy of the system is thought to be 10m. Since the Knudsen system is a sidemount rather than towed system, this accuracy is not diminished. Lineage: Process_Step: Process_Description: 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. Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: David S. Foster 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 x2271 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: dfoster@usgs.gov Process_Step: Process_Description: 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. Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: David S. Foster 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 x2271 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: dfoster@usgs.gov Process_Step: Process_Description: The shot point navigation for each line of seismic data was combined into a single file and then run through an AWK script which kept the first and last point of each line, and every shotpoint evenly divisible by 500. Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: VeeAnn A. Cross Contact_Organization: U.S. Geological Survey Contact_Position: Marine 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 x2251 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Process_Step: Process_Description: The files were edited such that the day and julian day accurately represented the UTC timing of these events. In some cases, when the navigation system acquires data past midnight, the day and julian day were not updated. Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: VeeAnn A. Cross Contact_Organization: U.S. Geological Survey Contact_Position: Marine 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 x2251 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Process_Step: Process_Description: These points were then imported into ArcView and saved as a shapefile. Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Entity point Point_and_Vector_Object_Count: 1213 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.0001 Longitude_Resolution: 0.0001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257222 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: seis500sht Attribute: Attribute_Label: FID Attribute_Definition: Internal feature number. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated. Attribute: Attribute_Label: Shape Attribute_Definition: Feature geometry. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Coordinates defining the features. Attribute: Attribute_Label: LONGITUDE Attribute_Definition: Longitude fix of the data point. Attribute_Definition_Source: Software acquired. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -114.711300 Range_Domain_Maximum: -114.571067 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: LATITUDE Attribute_Definition: Latitude fix for the data point. Attribute_Definition_Source: Software acquired. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 35.200633 Range_Domain_Maximum: 35.868300 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: LINENUM Attribute_Definition: Seismic trackline number along which the shotpoing was acquired. Attribute_Definition_Source: Software generated. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 60 Attribute: Attribute_Label: SHOT Attribute_Definition: Seismic shot point number at the data acquisition location. Attribute_Definition_Source: Software generated. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 30353 Attribute: Attribute_Label: MONTH Attribute_Definition: Month the data were acquired (referenced to UTC time). Attribute_Definition_Source: Scientist. Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 4 Enumerated_Domain_Value_Definition: Indicates April. Attribute: Attribute_Label: DAY Attribute_Definition: Day the data were acquired (referenced to UTC time). Attribute_Definition_Source: Scientist. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 18 Range_Domain_Maximum: 28 Attribute: Attribute_Label: YEAR Attribute_Definition: Year the data were acquired. Attribute_Definition_Source: Scientist. Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 2002 Enumerated_Domain_Value_Definition: Year. Attribute: Attribute_Label: JDAY Attribute_Definition: Julian day the data were acquired (referenced to UTC time). Attribute_Definition_Source: Scientist. Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 108 Range_Domain_Maximum: 118 Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: David S. Foster 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 x2271 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: dfoster@usgs.gov Resource_Description: Downloadable Data Distribution_Liability: 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 publication 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. Metadata_Reference_Information: Metadata_Date: 20040629 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: VeeAnn A. Cross Contact_Organization: U.S. Geological Survey Contact_Position: Marine 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 x2251 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile