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:
        The Sand Hills are the largest dune sea in the western hemisphere and represent a sentinel ecosystem because climate change impacts can lead to the possible mobilization of the dunes, dramatic effects on ecosystems, and changes to recharge of the underlying high plains aquifer. An Airborne electromagnetic (AEM) resistivity survey was performed in the area of Crescent Lakes National Wildlife Refuge as part of climate change studies. 
	AEM surveys map shallow and deep (< 300 m) subsurface hydrogeologic features that can be interpreted to provide hydrogeologic frameworks that are critical inputs for coupled hydrologic and climate models. Ground-water flow paths controlled by buried topography interpreted from new geophysical surveys are important in predicting how ground-water resources can be impacted from climate change. 
	A frequency domain AEM survey performed along three flight lines from a dune dam south of Crescent Lake and north to Hackberry and Gimlet lakes. The objective was to the map shallow hydrogeologic features of the southwestern part of the Sand Hills that contain a mix of fresh to saline lakes. The dune dam is defined by a resistive zone that has a depth of 45 meters suggesting that it influence modern ground-water flow paths and surface-water features. The lakes are defined by low resistivity which in the case of Gimlet Lake extends to depth. The saline waters may be following a buried paleo-channel of ancestral Blue Creek. 
      Purpose:
        Understanding how the climate history of dunes currently influences ground water quality and flow will be essential in assessing impacts from possible climate changes.  Modeling of coupled deep and shallow ground-water flow can be dramatically improved with input from AEM surveys combined with ground data. These hydrogeologic models placed in the context of climate change models are critical to understanding past climates and thresholds for future climate impacts on water use and availability to ecosystems.
    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.
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          Universal_Transverse_Mercator:
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              Longitude_of_Central_Meridian: -105.000000
              Latitude_of_Projection_Origin: 0.000000
              False_Easting: 500000.000000
              False_Northing: 0.000000
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        Entity_Type_Definition: Flight path of HEM survey
        Entity_Type_Definition_Source: U.S. Geological Survey
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        Attribute_Label: RES3300
        Attribute_Definition_Source: Fugro Report #08035
        Attribute_Definition: Preliminary Apparent Resistivity 3345 Hz Coaxial
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 0
            Range_Domain_Maximum: 91.692
            Attribute_Units_of_Measure: ohm-m
      Attribute:
        Attribute_Label: RES8200
        Attribute_Definition_Source: Fugro Report #08035
        Attribute_Definition: Preliminary Apparent Resistivity 8171 Hz
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 0
            Range_Domain_Maximum: 271.223
            Attribute_Units_of_Measure: ohm-m
      Attribute:
        Attribute_Label: RES40K
        Attribute_Definition_Source: Fugro Report #08035
        Attribute_Definition: Preliminary Apparent Resistivity 41020 Hz
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 0
            Range_Domain_Maximum: 466.68
            Attribute_Units_of_Measure: ohm-m
      Attribute:
        Attribute_Label: RES140K
        Attribute_Definition_Source: Fugro Report #08035
        Attribute_Definition: Preliminary Apparent Resistivity 129550 Hz
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 0
            Range_Domain_Maximum: 3718.016
            Attribute_Units_of_Measure: ohm-m
      Attribute:
        Attribute_Label: DEP400
        Attribute_Definition_Source: Fugro Report #08035
        Attribute_Definition: Preliminary Apparent Depth 380 Hz
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: -14.92
            Range_Domain_Maximum: 59.456
            Attribute_Units_of_Measure: m
      Attribute:
        Attribute_Label: DEP1800
        Attribute_Definition_Source: Fugro Report #08035
        Attribute_Definition: Preliminary Apparent Depth 1792.6 Hz
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: -29.23
            Range_Domain_Maximum: 43.097
            Attribute_Units_of_Measure: m
      Attribute:
        Attribute_Label: DEP3300
        Attribute_Definition_Source: Fugro Report #08035
        Attribute_Definition: Preliminary Apparent Depth 3345 Hz Coaxial
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: -32.621
            Range_Domain_Maximum: 35.792
            Attribute_Units_of_Measure: m
      Attribute:
        Attribute_Label: DEP8200
        Attribute_Definition_Source: Fugro Report #08035
        Attribute_Definition: Preliminary Apparent Depth 8171 Hz
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: -32.912
            Range_Domain_Maximum: 25.051
            Attribute_Units_of_Measure: m
      Attribute:
        Attribute_Label: DEP40K
        Attribute_Definition_Source: Fugro Report #08035
        Attribute_Definition: Preliminary Apparent Depth 41020 Hz
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: -33.32
            Range_Domain_Maximum: 15.642
            Attribute_Units_of_Measure: m
      Attribute:
        Attribute_Label: DEP140K
        Attribute_Definition_Source: Fugro Report #08035
        Attribute_Definition: Preliminary Apparent Depth 129550 Hz
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: -41.698
            Range_Domain_Maximum: 13.097
            Attribute_Units_of_Measure: m
      Attribute:
        Attribute_Label: DRES400
        Attribute_Definition_Source: Fugro Report #08035
        Attribute_Definition: Differential Apparent Resistivity 380 Hz
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 0
            Range_Domain_Maximum: 23.8
            Attribute_Units_of_Measure: m
      Attribute:
        Attribute_Label: DRES1800
        Attribute_Definition_Source: Fugro Report #08035
        Attribute_Definition: Differential Apparent Resistivity 1792.6 Hz
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 0
            Range_Domain_Maximum: 52.8
            Attribute_Units_of_Measure: m
      Attribute:
        Attribute_Label: DRES8200
        Attribute_Definition_Source: Fugro Report #08035
        Attribute_Definition: Differential Apparent Resistivity 8171 Hz
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 0
            Range_Domain_Maximum: 336.5
            Attribute_Units_of_Measure: m
      Attribute:
        Attribute_Label: DRES40K
        Attribute_Definition_Source: Fugro Report #08035
        Attribute_Definition: Differential Apparent 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