Identification_Information: Citation: Citation_Information: Originator: Janet Tilden Publication_Date: 2006 Title: tom_mag Geospatial_Data_Presentation_Form: vector digital data Online_Linkage: Larger_Work_Citation: Citation_Information: Originator: J. Tilden Originator: D. Ponce Originator: J. Glen Originator: B. Chuchel Originator: K. Tushman Originator: A. Duvall Publication_Date: 2006 Title: Gravity, magnetic, and physical property data in the Smoke Creek Desert area, northwest Nevada Series_Information: Series_Name: Open-File Report Issue_Identification: 2006-1197 Publication_Information: Publication_Place: Menlo Park, CA Publisher: U.S. Geological Survey Description: Abstract: Ground magnetic data collected in the Smoke Creek Desert area, northwest Nevada Purpose: Ground magnetic data were collected on the playa of the Smoke Creek Desert to identify shallow geologic features and supplement the detailed aeromagnetic data collected throughout the entire study area Supplemental_Information: Magnetic data were collected using a cesium vapor magnetometer attached to an aluminum carriage connected to the vehicle by aluminum tubing and towed about 9 m behind the vehicle. Data were recorded at 1 second intervals. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2006 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -119.817810 East_Bounding_Coordinate: -119.421830 North_Bounding_Coordinate: 40.933020 South_Bounding_Coordinate: 40.264060 Keywords: Theme: Theme_Keyword: magnetics Theme_Keyword: magnetic anomaly Place: Place_Keyword: Smoke Creek Desert Place_Keyword: Gerlach Place_Keyword: Squaw Creek Valley Access_Constraints: none Use_Constraints: Use of these digital data should not violate the spatial or attribute resolution of the data. Although the digital form of the data stores location and attribute values to several decimals of precision, the data are subject to the accuracy and precision inherent in the data due to data collection and processing limitations. Where these data are used in combination with other data, the precision and accuracy of the resulting dataset is limited by the precision and accuracy of the input datasets. Acknowledgement of the U.S. Geological Survey is appreciated for products derived from these data. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Janet Tilden Contact_Organization: U.S. Geological Survey Contact_Position: geophysicist Contact_Voice_Telephone: 650-329-5307 Contact_Electronic_Mail_Address: jtilden@usgs.gov Native_Data_Set_Environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: values are reported to the nearest 0.01 nT Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: GPS accuracy should be within 1m Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: GPS accuracy should be within 1m Lineage: Process_Step: Process_Description: Magnetic data were IGRF corrected using the IGRF 2000 model. These data were also corrected for diurnal variations using data collected by a portable proton-precession base station magnetometer. Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Point Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Entity point Point_and_Vector_Object_Count: 40796 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.00001 Longitude_Resolution: 0.00001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.400000 Denominator_of_Flattening_Ratio: 294.978698 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: National Geodetic Vertical Datum of 1929 Altitude_Resolution: 1.0 Altitude_Distance_Units: meters Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: tom_mag Entity_Type_Definition: ascii file 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: Line Attribute_Definition: transect line number Attribute_Definition_Source: author Attribute_Domain_Values: Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated. Attribute: Attribute_Label: Long_n27 Attribute_Definition: longitude coordinate Attribute_Definition_Source: author Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 0.00001 degrees Attribute: Attribute_Label: Lat_n27 Attribute_Definition: latitude coordinate Attribute_Definition_Source: author Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 0.00001 degrees Attribute: Attribute_Label: Mag_IG Attribute_Definition: diurnal and IGRF corrected mag Attribute_Definition_Source: author Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: nT Enumerated_Domain_Value_Definition: nanotesla Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 0.1 nT Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing and physical address Address: 345 Middlefield Rd. City: Menlo Park State_or_Province: CA Postal_Code: 94025 Resource_Description: Downloadable Data Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ASCII Transfer_Size: 1.712 Available_Time_Period: Time_Period_Information: Single_Date/Time: Calendar_Date: 2006 Metadata_Reference_Information: Metadata_Date: 20051115 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Janet Tilden Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing and physical address Address: 345 Middlefield Rd., MS 989 City: Menlo Park State_or_Province: CA Postal_Code: 94025 Contact_Voice_Telephone: 650-329-5307 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