Identification_Information: Citation: Citation_Information: Originator: V.E. Langenheim Originator: R.C. Jachens Originator: C.M. Wentworth Originator: R.J. McLaughlin Publication_Date: 2011 Title: Preliminary Aeromagnetic and aeromagnetic-based geologic maps of the Coastal Belt, Franciscan Complex, northern California Geospatial_Data_Presentation_Form: point digital data Series_Information: Series_Name: Scientific Investigations Map Issue_Identification: 3188 Publication_Information: Publication_Place: Menlo Park, CA Publisher: U.S. Geological Survey Online Linkage: http/pubs.usgs.gov/sim/3188 Description: Abstract: New aeromagnetic data in aeromagnetic maps of the Coastal Belt, Franciscan Complex, northern California Digital Files: The database includes an ASCII file containing new aeromagnetic data and two ASCII files with point locations of the local maximum horizontal gradient derived from the aeromagnetic data. This metadata file describes the new aeromagnetic data. Purpose: Aeromagnetic map identifies magnetic features as a basis for geophysical interpretations. Supplemental_Information: This database updates geophysical information originally presented in smaller-scale formats and includes detailed aeromagnetic data collected by Firefly Aviation, Ltd. using Geometrics G-822A cesium magnetometer for the airborne measurements and GEM System Overhauser GSM-19 magnetometer for the ground measurements. Lines were flown in an east-west direction and were spaced 800m apart. North-south tie lines were also flown spaced 8000 m apart. The survey was flown at a nominal 305m above topography. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 2009 Ending_Date: 2009 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -124.124 East_Bounding_Coordinate: -122.411 North_Bounding_Coordinate: 39.8826 South_Bounding_Coordinate: 39.0810 Keywords: Theme: Theme_Keyword: magnetics Theme_Keyword: magnetic anomaly Place: Place_Keyword: northern California Place_Keyword: Coast Ranges Access_Constraints: none Use_Constraints: Uses of this 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 is subject to the accuracy and precision inherent in the data due to data collection and processing limitations. Where this data is 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: Victoria Langenheim Contact_Organization: U.S. Geological Survey Contact_Position: geophysicist Contact_Address: Address_Type: physical address Address: 345 Middlefield Rd. City: Menlo Park State_or_Province: CA Postal_Code: 94025 Country: USA Contact_Voice_Telephone: 650-329-5313 Contact_Electronic_Mail_Address: zulanger@usgs.gov Native_Data_Set_Environment: Geosoft Oasis Montaj Native_Data_Set_Environment: Geosoft Oasis Montaj Geophysical data was stored and analyzed on a SUN Ultra4000 UNIX platform Geospatial_Data_Presentation_Form: ascii digital data (aeromagnetic data) Series_Information: Series_Name: U.S. Geological Survey (USGS) Scientific investigations map Issue_Identification: 3188 Publication_Information: Publication_Place: Menlo Park, California Publisher: U.S. Geological Survey Online_Linkage: Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: magnetic field values are reported to 0.01 nT Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: GPS accuracy should be within 1 meter Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: GPS accuracy should be within 1 meter Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Firefly Aviation, Ltd. Publication_Date: 2009 Title: Final Survey Report High-Resolution Aeromagnetic Survey: Ukiah, California, 2009 Geospatial_Data_Presentation_Form: vector digital data Type_of_Source_Media: disc Source_Citation_Abbreviation: Firefly Aviation, Ltd. Report Aeromagnetic Survey, Ukiah, California, 2009 Process_Step: Process_Description: Refer to Project Report by Firefly Aviation, Ltd. Process_Date: 2009 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: 1506682 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 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: 298.257 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: North American Vertical Datum of 1988 Altitude_Distance_Units: meters Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: ukiah_mag.xyz Attribute: Attribute_Label: Line Attribute_Definition: line number Attribute_Definition_Source: Firefly Aviation, Ltd. Attribute: Attribute_Label: lon_nad27 Attribute_Definition: longitude coordinate Attribute_Definition_Source: Firefly Aviation, Ltd. Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 0.2 m Attribute: Attribute_Label: lat_nad27 Attribute_Definition: latitude coordinate Attribute_Definition_Source: EON Geosciences, Inc Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 0.2 m Attribute: Attribute_Label: X_wgs84 Attribute_Definition: x UTM zone 10 coordinate Attribute_Definition_Source: Firefly Aviation, Ltd. Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 0.2 m Attribute: Attribute_Label: Y_wgs84 Attribute_Definition: y UTM zone 10 coordinate Attribute_Definition_Source: Firefly Aviation, Ltd. Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 0.2 m Attribute: Attribute_Label: X_nad27 Attribute_Definition: x UTM zone 10 coordinate Attribute_Definition_Source: Firefly Aviation, Ltd. Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 0.2 m Attribute: Attribute_Label: Y_nad27 Attribute_Definition: y UTM zone 10 coordinate Attribute_Definition_Source: Firefly Aviation, Ltd. Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 0.2 m Attribute: Attribute_Label: gtime Attribute_Definition: GPS time, seconds past midnight Attribute_Definition_Source: Firefly Aviation, Ltd. Attribute: Attribute_Label: date Attribute_Definition: year/month/day (YYYY/MM/DD) Attribute_Definition_Source: Firefly Aviation, Ltd. Attribute: Attribute_Label: radarm Attribute_Definition: radar height (meters above ground level) Attribute_Definition_Source: Firefly Aviation, Ltd. Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 1.5 m Attribute: Attribute_Label: barom Attribute_Definition: barometric elevation (meters above mean sea level) Attribute_Definition_Source: Firefly Aviation, Ltd. Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 1.5 m Attribute: Attribute_Label: galt Attribute_Definition: GPS height above WGS84 geoid Attribute_Definition_Source: Firefly Aviation, Ltd. Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 0.2 m Attribute: Attribute_Label: diurnal Attribute_Definition: measured base station magnetic field, located at Ukiah airport, CA Attribute_Definition_Source: Firefly Aviation, Ltd. Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 0.1 nT Attribute: Attribute_Label: rawmag Attribute_Definition: raw magnetic total field (uncompensated) Attribute_Definition_Source: Firefly Aviation, Ltd. Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 0.1 nT Attribute: Attribute_Label: cmag Attribute_Definition: compensated raw magnetic field Attribute_Definition_Source: Firefly Aviation, Ltd. Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 0.2 nT Attribute: Attribute_Label: magdc Attribute_Definition: diurnally-corrected compensated magnetic field Attribute_Definition_Source: Firefly Aviation, Ltd. Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 0.1 nT Attribute: Attribute_Label: maglag Attribute_Definition: lag corrected magdc magnetic field Attribute_Definition_Source: Firefly Aviation, Ltd. Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 0.1 nT Attribute: Attribute_Label: igrf Attribute_Definition: IGRF model 2005 calculated for actual time and elevation of data acquisition Attribute_Definition_Source: Firefly Aviation, Ltd. Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 0.1 nT Attribute: Attribute_Label: magigrf Attribute_Definition: maglag minus igrf correction plus 54425 nT Attribute_Definition_Source: Firefly Aviation, Ltd.s Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 0.2 nT Attribute: Attribute_Label: tielev Attribute_Definition: preliminary leveled total field mag (tie lines only) Attribute_Definition_Source: Firefly Aviation, Ltd. Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 0.2 nT Attribute: Attribute_Label: maglev Attribute_Definition: Preliminary leveled traverse lines (using tielev) Attribute_Definition_Source: Firefly Aviation, Ltd. Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 0.2 nT Attribute: Attribute_Label: magfinal Attribute_Definition: final tie-line leveled, decorrugated and microleveled magnetic field Attribute_Definition_Source: Firefly Aviation, Ltd. Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 0.2 nT Distribution_Information: Distributor: U.S. Geological Survey Resource_Description: Downloadable Data Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ASCII with first line being a header (denoted by "\") Transfer_Size: 347237415 Network_Resource_Name: http://pubs.usgs.gov/sim/3188 Process_Date: 2009-2010 Process_Step: Process_Description: Geophysical mapping Prior to data collection, Figure of Merit (FOM), altimeter calibration and lag tests were performed. Processing of the data was performed using Geosoft Oasis Montaj software package. Data were corrected for diurnal variations using the base station at the Ukiah airport. Compensation of the single tail sensor against aircraft and directional magnetic signals was applied real-time. Data were then leveled and the International Geomagnetic Reference Field was removed using the 2005 model, the flight date, and the altitude of the smoothed flown surface. Data are ordered according to line number. Metadata_Reference_Information: Metadata_Date: 20110310 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Victoria Langenheim Contact_Organization: U.S. Geological Survey Contact_Position: geophysicist Contact_Address: Address_Type: mailing and physical address Address: 345 Middlefield Rd. City: Menlo Park State_or_Province: CA Postal_Code: 94025 Contact_Voice_Telephone: 650-329-5313 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