Metadata: Identification_Information: Native_Data_Set_Environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.3.0.1770 Description: Abstract: This report is a release of digital data from a helicopter electromagnetic and magnetic survey that was conducted during June 2009 in areas of western Nebraska as part of a joint hydrologic study by the North Platte Natural Resource District (NRD), South Platte NRD, and U.S. Geological Survey. The survey consisted of 937 line kilometers (582 line miles). The objective of the contracted survey, conducted by Fugro Airborne, Ltd., is to improve the understanding the relationship between surface water and groundwater systems critical to developing groundwater models used in management programs for water resources. A unique aspect of the survey is the flight line layout. One set of flight lines were flown in a diagonal pattern extending along the length of the previously collected airborne data. The success of this survey design depended on a well understood regional hydrogeologic framework and model developed by the Cooperative Hydrologic Study of the Platte River Basin and the airborne geophysical data collected in 2008. Resistivity variations along lines could be related to this framework. In addition to these lines, more traditional surveys consisting of parallel flight lines separated by about 400m were carried out for three blocks in the North Platte NRD, South Platte NRD and in the area of Crescent Lakes each of the drainages. These surveys helped to establish the spatial variations of the resistivity of hydrostratigraphic units. An additional survey was flown over the Crescent Lake area. The objective of this survey, funded by the USGS Office of Groundwater , was to map shallow hydrogeologic features of the southwestern part of the Sand Hills that contain a mix of fresh to saline lakes. The electromagnetic equipment consisted of six different coil-pair orientations that measured resistivity at separated frequencies from about 400 Hz to about 140,000 Hz. The electromagnetic data along flight lines were converted to electrical resistivity. The resulting line data was converted to geo-referenced grids and maps which are included with this report. The electrical resistivity data was then input into a numerical inversion to recover resistivity variations with depth. In addition to the electromagnetic data, total field magnetic data and digital elevation data were collected. Data released in this report consists of data along flight lines, digital grids, digital databases of the inverted electrical resistivity with depth, and digital maps of the apparent resistivity and total magnetic field. The depth range of the subsurface investigation for the electromagnetic survey (estimated as deep as 60m) is comparable to the depth of shallow aquifers. The geophysical data and hydrologic information from U.S. Geological Survey and cooperator studies are being used by resource managers to develop ground-water resource plans for the area. In addition, data will be used to refine hydrologic models in western Nebraska. Purpose: The purpose of this study is to enhance understanding of the ground-water and surface-water relationships in Western Nebraska. This data set provides the flight path for the helicopter electromagnetic (HEM) survey in a block near Morrill, Nebraska running north-south in the North Platte NRD area. Citation: Citation_Information: Originator: Smith, Cannia Publication_Date: Unknown Title: North Platte River block flightpath Geospatial_Data_Presentation_Form: vector digital data Online_Linkage: \\IGSKDBCWLT160\D\working_directory\dfa00\flight_path\NPlatteBlock.shp Time_Period_of_Content: Currentness_Reference: ground condition Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20080615 Ending_Date: 20080623 Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -103.981066 East_Bounding_Coordinate: -103.909507 North_Bounding_Coordinate: 42.103818 South_Bounding_Coordinate: 41.898510 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme_Keyword: imageryBaseMapsEarthCover Theme_Keyword: environment Place: Place_Keyword: Nebraska Place_Keyword: Scottsbluff Place_Keyword: Morrill Place_Keyword_Thesaurus: Geographic Names Information System Place_Keyword: Sidney Place_Keyword: Kimball Place_Keyword: Gering Place_Keyword: Mitchell Place_Keyword: Bridgeport Access_Constraints: None Use_Constraints: None Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Bruce D. Smith Contact_Organization: U.S. Geological Survey Contact_Position: ?? Contact_Electronic_Mail_Address: bsmith@usgs.gov Contact_Address: Address: PO Box 25046,MS973 Address_Type: mailing address Address: Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 303.236.1399 Contact_Instructions: Contact via email Metadata_Reference_Information: Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Contact: Contact_Information: Contact_Address: Address_Type: mailing and physical address City: Lincoln State_or_Province: NE Postal_Code: 68512 Address: 5231 S 19th Street Country: USA Contact_Voice_Telephone: 402.328.4100 Contact_Person_Primary: Contact_Person: ?? Contact_Organization: U.S. Geological Survey Contact_Position: ?? Contact_Electronic_Mail_Address: xxxx@usgs.gov Contact_Instructions: Contact via email Metadata_Date: 20081204 Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile Distribution_Information: Resource_Description: Downloadable Data Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Transfer_Size: 2.999 Format_Name: Shapefile Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://water.usgs.gov/GIS/ashland_HEMflight_path_nad83.zip Fees: None Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Position: Water Webserver Team Contact_Address: Address_Type: mailing address Address: 12201 Sunrise Valley Drive, MS 440 City: Reston State_or_Province: VA Postal_Code: 20192 Country: USA Contact_Voice_Telephone: 1-888-475-8747 (1-888-ASK-USGS) Contact_Instructions: Contact via email Distribution_Liability: Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. 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: 71470 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Planar_Distance_Units: meters Coordinate_Representation: Abscissa_Resolution: 1.49693125 Ordinate_Resolution: 1.49693125 Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 13 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -105.000000 Latitude_of_Projection_Origin: 0.000000 False_Easting: 500000.000000 False_Northing: 0.000000 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 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Altitude_Resolution: 0.01 Altitude_Datum_Name: Height above WGS84 ellipsoid Altitude_Distance_Units: meters Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: NPlatteBlock Entity_Type_Definition: Flight path of HEM survey Entity_Type_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: FID Attribute_Definition: Internal feature number. 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Resistivity 41020 Hz Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 299.6 Attribute_Units_of_Measure: m Attribute: Attribute_Label: DRES140K Attribute_Definition_Source: Fugro Report #08035 Attribute_Definition: Differential Apparent Resistivity 129550 Hz Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 3718 Attribute_Units_of_Measure: m Attribute: Attribute_Label: DDEP400 Attribute_Definition_Source: Fugro Report #08035 Attribute_Definition: Differential Depth 380 Hz Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 123 Attribute_Units_of_Measure: m Attribute: Attribute_Label: DDEP1800 Attribute_Definition_Source: Fugro Report #08035 Attribute_Definition: Differential Depth 1792.6 Hz Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 94.2 Attribute_Units_of_Measure: m Attribute: Attribute_Label: DDEP8200 Attribute_Definition_Source: Fugro Report #08035 Attribute_Definition: Differential Depth 8171 Hz Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 67 Attribute_Units_of_Measure: m Attribute: Attribute_Label: DDEP40K Attribute_Definition_Source: Fugro Report #08035 Attribute_Definition: Differential Depth 41020 Hz Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 40 Attribute_Units_of_Measure: m Attribute: Attribute_Label: DDEP140K Attribute_Definition_Source: Fugro Report #08035 Attribute_Definition: Differential Depth 129550 Hz Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 19 Attribute_Units_of_Measure: m Attribute: Attribute_Label: CEN400 Attribute_Definition_Source: Fugro Report #08035 Attribute_Definition: Centroid Depth 380 Hz Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 22.2 Range_Domain_Maximum: 67.4 Attribute_Units_of_Measure: m Attribute: Attribute_Label: CEN1800 Attribute_Definition_Source: Fugro Report #08035 Attribute_Definition: Centroid Depth 1792.6 Hz Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 12.6 Range_Domain_Maximum: 50.3 Attribute_Units_of_Measure: m Attribute: Attribute_Label: CEN8200 Attribute_Definition_Source: Fugro Report #08035 Attribute_Definition: Centroid Depth 8171 Hz Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 6.4 Range_Domain_Maximum: 45.8 Attribute_Units_of_Measure: m Attribute: Attribute_Label: CEN40K Attribute_Definition_Source: Fugro Report #08035 Attribute_Definition: Centroid Depth 41020 Hz Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2.4 Range_Domain_Maximum: 27.2 Attribute_Units_of_Measure: m Attribute: Attribute_Label: CEN140K Attribute_Definition_Source: Fugro Report #08035 Attribute_Definition: Centroid Depth 129550 Hz Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2.5 Range_Domain_Maximum: 94 Attribute_Units_of_Measure: m Attribute: Attribute_Label: UTC Attribute_Definition_Source: Fugro Report #08035 Attribute_Definition: Time Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 50265 Range_Domain_Maximum: 83396.9 Attribute_Units_of_Measure: sec Attribute: Attribute_Label: FLIGHT Attribute_Definition_Source: Fugro Report #08035 Attribute_Definition: Flight number Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1001 Range_Domain_Maximum: 1006 Attribute_Units_of_Measure: unitless Attribute: Attribute_Label: DATE Attribute_Definition_Source: Fugro Report #08035 Attribute_Definition: Date Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2008.45 Range_Domain_Maximum: 2008.45 Attribute_Units_of_Measure: yyyy/mm/dd Attribute: Attribute_Label: LATWGS84 Attribute_Definition_Source: Fugro Report #08035 Attribute_Definition: Latitude referenced to WGS84 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 41.8988593 Range_Domain_Maximum: 42.1034742 Attribute_Units_of_Measure: dd Attribute: Attribute_Label: LONWGS84 Attribute_Definition_Source: Fugro Report #08035 Attribute_Definition: Longitude referenced to WGS84 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -103.9780131 Range_Domain_Maximum: -103.9128433 Attribute_Units_of_Measure: dd Attribute: Attribute_Label: ALTL_FP Attribute_Definition_Source: Fugro Report #08035 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 160.63 Attribute_Units_of_Measure: m Attribute_Definition: EM Bird to Earth-Surface, Laser Altimeter Attribute: Attribute_Label: ALTR Attribute_Definition_Source: Fugro Report #08035 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 174.1 Range_Domain_Maximum: 378.34 Attribute_Units_of_Measure: m Attribute_Definition: unknown Attribute: Attribute_Label: KPA Attribute_Definition_Source: Fugro Report #08035 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 86.67 Range_Domain_Maximum: 88.328 Attribute_Units_of_Measure: kPa Attribute_Definition: unknown Attribute: Attribute_Label: Z_BIRD Attribute_Definition_Source: Fugro Report #08035 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1228.2 Range_Domain_Maximum: 1358.4 Attribute_Units_of_Measure: m Attribute_Definition: Leveled height of EM bird above WGS84 ellipsoid Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Arc feature attribute values were inspected and found to be consistently coded as described in the Entity and Attribute section. Logical_Consistency_Report: Using ArcGIS tools and routines all arcs were checked for node errors, overshoots, undershoots, dangles, intersections, and duplicate features. Completeness_Report: This data set includes only the flightpath block near Morrill, Nebraska running north-south in the North Platte NRD area. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Horizontal accuracy was not assessed. Lineage: Process_Step: Process_Description: The flight path was recorded during the HEM survey and exported to an AutoCAD format *.dxf file containing the line number annotation and the lines surveyed. Process_Date: 200806 Process_Step: Process_Description: Metadata imported. Source_Used_Citation_Abbreviation: D:\working_directory\dfa00\flight_path\additional.shp.xml Process_Date: 20081202 Process_Time: 15291200 Process_Step: Process_Description: Metadata imported. Source_Used_Citation_Abbreviation: D:\working_directory\dfa00\flight_path\lodgepole.shp.xml Process_Date: 20081202 Process_Time: 15390500 Process_Step: Process_Description: Metadata imported. Source_Used_Citation_Abbreviation: D:\working_directory\dfa00\flight_path\SidneyD_NE.shp.xml Process_Date: 20081202 Process_Time: 15485300 Process_Step: Process_Description: Metadata imported. Source_Used_Citation_Abbreviation: D:\working_directory\dfa00\flight_path\NPlatte_EW.shp.xml Process_Date: 20081202 Process_Time: 15524000 Process_Step: Process_Description: Metadata imported. Source_Used_Citation_Abbreviation: D:\working_directory\dfa00\flight_path\NPlatte_NS.shp.xml Process_Date: 20081204 Process_Time: 08004000