Identification_Information:

    Citation:

      Citation_Information:

        Originator: Alberta Energy Regulator

        Originator: Alberta Geological Survey

        Originator: Nakevska, N.

        Publication_Date: 2026

        Title: Distribution of Hydraulic Head in the Granite Wash in Alberta (gridded data, ASCII format)

        Geospatial_Data_Presentation_Form: raster digital data

        Series_Information:

          Series_Name: Digital Data

          Issue_Identification: DIG 2025-0015

        Publication_Information:

          Publication_Place: Edmonton, Alberta, Canada

          Publisher: Alberta Geological Survey

        Online_Linkage: https://ags.aer.ca/publications/all-publications/dig-2025-0015

    Description:

      Abstract: This grid represents the hydraulic head distribution in the Granite Wash in Alberta. The grid is a result of a geostatistical model constructed using pressure data from oil and gas well drillstem tests and a reference formation water density of 1.117 g/cm3, representative of formation waters in the Gilwood Member (Watt Mountain Formation) and Granite Wash.

The hydraulic head surface was mapped at a regional scale using many years of data, thus providing a general indication of regional groundwater flow within the unit rather than site-specific values.

      Purpose: To provide a gridded dataset representing the distribution of hydraulic head in the Granite Wash in Alberta.

      Supplemental_Information: Language: In English;

    Time_Period_of_Content:

      Time Period Information:

        Single Date/Time:

          Calendar_Date: 2010

    Currentness_Reference: ground condition

  Status:

    Progress: Complete

    Maintenance_and_Update_Frequency: None planned

  Spatial Domain:

    Bounding Coordinates:

      West_Bounding_Coordinate: -118.90848

      East_Bounding_Coordinate: -114.32263

      North_Bounding_Coordinate: 57.53896

      South_Bounding_Coordinate: 55.17721

  Keywords:

    Theme:

      Theme_Keyword_Thesaurus: ISO 19115 Topic Category

      Theme_Keyword: drillstem test

      Theme_Keyword: granite wash

      Theme_Keyword: groundwater

      Theme_Keyword: hydraulic head

      Theme_Keyword: hydrogeology

      Theme_Keyword: potentiometric surface

    Place:

      Place_Keyword_Thesaurus: ISO 19115 Topic Category

      Place_Keyword: alberta

      Place_Keyword: canada

      Place_Keyword: northwestern alberta

      Place_Keyword: west-central alberta

      Place_Keyword: western canada sedimentary basin

  Access_Constraints: Public

  Use_Constraints: Acknowledgement of the Alberta Energy Regulator / Alberta Geological Survey as the originator/source of this information is required as described in the Open Government License - Alberta.

  Point_of_Contact:

    Contact_Information:

      Contact_Organization_Primary:

        Contact_Organization: Alberta Geological Survey

        Contact_Person: AGS Information Manager

      Contact_Position: AGS Information Manager

      Contact_Address:

        Address_Type: mailing and physical

        Address: Alberta Energy Regulator

        Address: 2nd Floor, Twin Atria Building

        Address: 4999-98 Avenue NW

        City: Edmonton

        State_or_Province: Alberta

        Postal_Code: T6B 2X3

        Country: Canada

      Contact_Voice_Telephone: (780) 638-4491

      Contact_Facsimile_Telephone: (780) 422-1459

      Contact_Electronic_Mail_Address: AGS-Info@aer.ca

      Hours_of_Service: 8:00 a.m. to 12:00 p.m. and 1:00 p.m. to 4:30 p.m.

  Cross_Reference:

    Citation_Information:

      Originator: Alberta Energy Regulator

      Originator: Alberta Geological Survey

      Originator: Nakevska, N.

      Publication_Date: 2025

      Title: Distribution of Hydraulic Head in the Granite Wash in Alberta (tabular data, tab-delimited format)

      Geospatial_Data_Presentation_Form: tabular digital data

      Series_Information:

        Series_Name: Digital Data

        Issue_Identification: DIG 2025-0014

      Publication_Information:

        Publication_Place: Edmonton, Alberta, Canada

        Publisher: Alberta Geological Survey

      Online_Linkage: https://ags.aer.ca

Data_Quality_Information:

  Attribute_Accuracy:

    Attribute_Accuracy_Report: The following statistics describes the accuracy of the geostatistical layer used to create the final grid:

Mean error: -0.8 m

Root mean square error: 12.6 m

Average standard error: 12.1 m

Root mean square standardized: 1.1

  Logical_Consistency_Report: Grid cell spacing is 500 m by 500 m. Grid cells with no data are assigned the value -9999.

  Completeness_Report: The final gridded surface was clipped based on the Granite Wash extent and the spatial distribution of data. Interpolation was extended into data-sparse areas where the hydraulic head trend appeared reasonable.

  Positional_Accuracy:

    Horizontal_Positional_Accuracy:

   Horizontal_Positional_Accuracy_Report: See AGS DIG 2025-0014 (data points) for details on the horizontal accuracy of the input point data, which is affected by the locational accuracy of the wells.

    Vertical_Positional_Accuracy:

   Vertical_Positional_Accuracy_Report: See AGS DIG 2025-0014 (data points) for details on the horizontal accuracy of the input point data, which is affected by the locational accuracy of the wells.

  Lineage:

    Source_Information:

      Source_Citation:

        Citation_Information:

          Originator: Alberta Energy Regulator

          Originator: Alberta Geological Survey

          Originator: Nakevska, N.

          Publication_Date: 2025

          Title: Distribution of Hydraulic Head in the Granite Wash in Alberta (tabular data, tab-delimited format)

          Geospatial_Data_Presentation_Form: tabular digital data

          Series_Information:

            Series_Name: Digital Data

            Issue_Identification: DIG 2025-0014

          Publication_Information:

            Publication_Place: Edmonton, Alberta, Canada

            Publisher: Alberta Geological Survey

          Online_Linkage: https://ags.aer.ca/publications/all-publications/dig-2025-0014

   Source_Scale_Denominator:

   Type_of_Source_Media: online

        Source Time Period of Content:

          Time Period Information:

            Single Date/Time:

       Calendar_Date: 2025

     Source_Currentness_Reference: publication date

     Source_Citation_Abbreviation: DIG 2025-0014

     Source_Contribution: hydraulic head data

    Process_Step:

   Process_Description: The selection criteria and the final dataset used for interpolation of this grid are documented in the metadata for AGS DIG 2025-0014.

Step 1 (Modelling the surface): An ordinary kriging algorithm was used in the ArcGIS Pro Geostatistical Analyst extension to interpolate the hydraulic head values and create a grid of the hydraulic head surface for the Granite Wash.

Method report:

Output surface type: Prediction

Order of trend removal: First

Function type: Semivariogram

Type: Circular

Neighbourhood type: smooth

Smoothing factor: 0.2

Step 2 (Grid Alterations): The final grid was clipped based on the extent of the Granite Wash, and spatial distribution of data.

   Process_Date: 2025

  Data_Quality_Information:

Spatial_Data_Organization_Information: Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Grid Cell

Row_Count: 646

Column_Count: 600

Spatial_Reference_Information: Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: NAD_1983_Transverse_Mercator

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9992

Longitude_of_Central_Meridian: -115.0

Latitude_of_Projection_Origin: 0.0

False_Easting: 500000.0

False_Northing: 0.0

Geodetic_Model:

Horizontal_Datum_Name: D North American 1983

Ellipsoid_Name: GRS 1980

Semi-Major_Axis: 6378137.0

Denominator_of_Flattening_Ratio: 298.257222101

Entity_and_Attribute_Information: Entity_and_Attribute_Overview: Grid cell values represent the distribution of hydraulic head in metres above sea level within the Granite Wash in Alberta. Values are floating point data type.

  Distribution_Information:

    Distributor:

      Contact_Information:

        Contact_Organization_Primary:

          Contact_Organization: Alberta Geological Survey

          Contact_Person: AGS Information Manager

        Contact_Position: AGS Information Manager

        Contact_Address:

          Address_Type: mailing and physical

          Address: Alberta Energy Regulator

          Address: 2nd Floor, Twin Atria Building

          Address: 4999-98 Avenue NW

          City: Edmonton

          State_or_Province: Alberta

          Postal_Code: T6B 2X3

          Country: Canada

        Contact_Voice_Telephone: (780) 638-4491

        Contact_Facsimile_Telephone: (780) 422-1459

        Contact_Electronic_Mail_Address: AGS-Info@aer.ca

        Hours_of_Service: 8:00 a.m. to 12:00 p.m. and 1:00 p.m. to 4:30 p.m.

Distribution_Liability: The Alberta Energy Regulator / Alberta Geological Survey (AER/AGS) licenses this information under the Open Government License - Alberta. Any references to proprietary software in our documentation, and/or any use of proprietary data formats in our releases, do not constitute endorsement by the AER/AGS of any manufacturer's product.

  Metadata_Reference_Information:

    Metadata_Date: 20251014

    Metadata_Contact:

      Contact_Information:

        Contact_Organization_Primary:

          Contact_Organization: Alberta Geological Survey

          Contact_Person: AGS Information Manager

        Contact_Position: AGS Information Manager

        Contact_Address:

          Address_Type: mailing and physical

          Address: Alberta Energy Regulator

          Address: 2nd Floor, Twin Atria Building

          Address: 4999-98 Avenue NW

          City: Edmonton

          State_or_Province: Alberta

          Postal_Code: T6B 2X3

          Country: Canada

        Contact_Voice_Telephone: (780) 638-4491

        Contact_Facsimile_Telephone: (780) 422-1459

        Contact_Electronic_Mail_Address: AGS-Info@aer.ca

        Hours_of_Service: 8:00 a.m. to 12:00 p.m. and 1:00 p.m. to 4:30 p.m.

    Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata

    Metadata_Standard_Version: FGDC-STD-001-1998

    Metadata_Time_Convention: local time

    Metadata_Access_Constraints: none

    Metadata_Use_Constraints: none