Identification Information:
Citation:
Citation Information:
Originator: Alberta Energy Regulator
Originator: Alberta Geological Survey
Originator: Liggett, J.E.
Publication Date: 201703
Title:
Potentiometric Surface of the Scollard / Willow Creek Hydrostratigraphic Unit in the Calgary-Lethbridge Corridor, Southwestern Alberta (gridded data, ASCII format)
Geospatial Data Presentation Form: raster digital data
Series Information:
Series Name: Digital Data
Issue Identification: DIG 2016-0019
Publication Information:
Publication Place: Edmonton, Alberta, Canada
Publisher: Alberta Geological Survey
Online Linkage: http://ags.aer.ca/document/DIG/DIG_2016_0019.zip
Description:
Abstract:

This dataset is part of the regional hydrogeological mapping of the Calgary-Lethbridge Corridor (CLC) in southern Alberta. It represents the potentiometric surface of the Scollard / Willow Creek hydrostratigraphic unit (HSU) interpolated from wells in Alberta Environment and Parks' (AEP) Alberta Water Well Information Database (AWWID). The potentiometric surface was mapped at a regional scale using many years of data, thus providing a good indication of regional hydraulic head and flow direction rather than site specific values.

This dataset supplements Alberta Geological Survey Report 91, which includes details on the data processing and potentiometric surface interpolation in the CLC.

Purpose: To provide the regional potentiometric surface for the Scollard / Willow Creek HSU in the CLC.
Supplemental Information: Language: In English;
Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date: 2014
Ending Date: 2015
Currentness Reference: compilation date
Status:
Progress: Complete
Maintenance and Update Frequency: None planned
Spatial Domain:
Bounding Coordinates:
West Bounding Coordinate: -114.174368
East Bounding Coordinate: -112.536774
North Bounding Coordinate: 51.261241
South Bounding Coordinate: 49.052266
Keywords:
Theme:
Theme Keyword Thesaurus: none
Theme Keyword: geology
Theme Keyword: gis data
Theme Keyword: groundwater
Theme Keyword: hydraulic head
Theme Keyword: hydrogeology
Theme Keyword: potentiometric surface
Place:
Place Keyword Thesaurus: none
Place Keyword: 82h
Place Keyword: 82i
Place Keyword: 82p
Place Keyword: alberta
Place Keyword: calgary
Place Keyword: canada
Place Keyword: lethbridge
Place Keyword: southern alberta
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: 4th 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: Atkinson, L.A.
Originator: Liggett, J.E.
Originator: Hartman, G.M.D.
Originator: Nakevska, N.
Originator: Mei, S.
Originator: MacCormack, K.E.
Originator: Palombi, D.
Publication Date: 201702
Title:
Regional Geological and Hydrogeological Characterization of the Calgary-Lethbridge Corridor in the South Saskatchewan Regional Planning Area
Geospatial Data Presentation Form: document
Series Information:
Series Name: Report
Issue Identification: REP 91
Publication Information:
Publication Place: Edmonton, Alberta, Canada
Publisher: Alberta Geological Survey
Other Citation Details: ISBN: 978-1-4601-0158-2
Online Linkage: http://www.ags.aer.ca
Cross Reference:
Citation Information:
Originator: Alberta Energy Regulator
Originator: Alberta Geological Survey
Originator: Liggett, J.E.
Originator: Nakevska, N.
Publication Date: 201703
Title:
Calgary-Lethbridge Corridor Hydraulic Head Data for Potentiometric Surface Mapping (tabular data, tab-delimited format)
Geospatial Data Presentation Form: tabular digital data
Series Information:
Series Name: Digital Data
Issue Identification: DIG 2016-0022
Publication Information:
Publication Place: Edmonton, Alberta, Canada
Publisher: Alberta Geological Survey
Online Linkage: http://www.ags.aer.ca
Cross Reference:
Citation Information:
Originator: Alberta Energy Regulator
Originator: Alberta Geological Survey
Originator: Liggett, J.E.
Publication Date: 201703
Title:
Potentiometric Surface of the Horseshoe Canyon / St. Mary River Hydrostratigraphic Unit in the Calgary-Lethbridge Corridor, Southwestern Alberta (gridded data, ASCII format)
Geospatial Data Presentation Form: raster digital data
Series Information:
Series Name: Digital Data
Issue Identification: DIG 2016-0020
Publication Information:
Publication Place: Edmonton, Alberta, Canada
Publisher: Alberta Geological Survey
Online Linkage: http://www.ags.aer.ca
Cross Reference:
Citation Information:
Originator: Alberta Energy Regulator
Originator: Alberta Geological Survey
Originator: Liggett, J.E.
Publication Date: 201703
Title:
Potentiometric Surface of the Paskapoo / Porcupine Hills Hydrostratigraphic Unit in the Calgary-Lethbridge Corridor, Southwestern Alberta (gridded data, ASCII format)
Geospatial Data Presentation Form: raster digital data
Series Information:
Series Name: Digital Data
Issue Identification: DIG 2016-0021
Publication Information:
Publication Place: Edmonton, Alberta, Canada
Publisher: Alberta Geological Survey
Online Linkage: http://www.ags.aer.ca
Data Quality Information:
Logical Consistency Report:
Grid cell spacing is 400 m by 400 m, and any grid cells with a null value have been assigned the value -9999.
Completeness Report:
The final potentiometric surface map covers an area where the Scollard / Willow Creek HSU exists in the subsurface, and where buffers of 2500 m around the hydraulic head point data were intersecting one another.
Positional Accuracy:
Horizontal Positional Accuracy:
Horizontal Positional Accuracy Report:
The interpolated surface may have up to 400 m (occasionally 800 m) of horizontal error due to the positional accuracy of the input hydraulic head point data. Wells in the AWWID are frequently placed in the middle of a quarter section (occasionally a section) because their exact location within the quarter section (or section) is not known. See DIG 2016-0022 and AGS Report 91 for details on the accuracy of the hydraulic head point data.
Vertical Positional Accuracy:
Vertical Positional Accuracy Report:

See DIG 2016-0022 and AGS Report 91 for details on the vertical accuracy of the input hydraulic head point data, which is affected by the locational accuracy of the wells.

The following statistics describe the accuracy of the interpolated grid in relation to the input hydraulic head point data:

Root mean square error = 3.8 m

Mean error = -0.4 m

Standard deviation = 3.7

Maximum error = +21.7 m/-33.3 m

Lineage:
Source Information:
Source Citation:
Citation Information:
Originator: Alberta Energy Regulator
Originator: Alberta Geological Survey
Originator: Liggett, J.E.
Originator: Nakevska, N.
Publication Date: 201703
Title:
Calgary-Lethbridge Corridor Hydraulic Head Data for Potentiometric Surface Mapping (tabular data, tab-delimited format)
Geospatial Data Presentation Form: tabular digital data
Series Information:
Series Name: Digital Data
Issue Identification: DIG 2016-0022
Publication Information:
Publication Place: Edmonton, Alberta, Canada
Publisher: Alberta Geological Survey
Source Scale Denominator: 0
Type of Source Media: online
Source Time Period of Content:
Time Period Information:
Single Date/Time:
Calendar Date: 2016
Source Currentness Reference: Publication date
Source Citation Abbreviation: DIG 2016-0022
Source Contribution: Hydraulic head point data used to interpolate potentiometric surface
Process Step:
Process Description:

Methodology to create this grid dataset is documented in AGS Report 91. AWWID dataset (from which hydraulic head values were sourced) was current up to April 2013.

Step 1 (Modelling the surface): An ordinary kriging algorithm was used in the ArcMap Geostatistical Analyst extension to interpolate the hydraulic head values and create a grid of the potentiometric surface of the Scollard / Willow Creek HSU. Wells in the AWWID are often only located to the middle of the quarter section (or sometimes section) and thus co-located data points exist. In these cases a mean of the hydraulic head was used for the interpolation. Initially, all wells in the AWWID with suitable hydraulic information (i.e. wells with only one well record, a single screened interval, a single static water level, and not under flowing artesian conditions) were used to interpolate the potentiometric surface. Wells with large deviations from the interpolated grid were examined and outliers removed if necessary. A final version of the grid was interpolated with remaining wells (wells found in DIG 2016-0022).

Method Report:

Method: CoKriging

Type: Ordinary

Output type: Prediction

Trend type: First

Trend removal: Local polynomial interpolation

Power: 1

Variogram: Semivariogram

Number of lags: 18

Lag size: 400

Nugget: 13.683

Measurement error percentage: 100

Model type: Stable

Range: 7200

Anisotropy: No

Partial sill: 707.176

Total points: 5870

Cell Size: 400 m

Root mean square error (considering only final clipped grid): 3.8 m

Source Used Citation Abbreviation: DIG 2016-0022
Process Date: 2015
Process Step:
Process Description:
Step 2 (Grid Alterations): Areas of the original extent of the grid results were clipped based on 1) the absence of the Scollard / Willow Creek HSU (i.e., the eastern edge of the subcrop of the HSU); and 2) the area being outside a buffer area, which consists of areas of contiguous 2500 m buffers around wells.
Process Date: 2015
Process Step:
Process Description: Updated metadata.
Process Date: 2019
Spatial Data Organization Information:
Direct Spatial Reference Method: Raster
Raster Object Information:
Raster Object Type: Pixel
Row Count: 608
Column Count: 279
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
Planar Coordinate Information:
Planar Coordinate Encoding Method: coordinate pair
Coordinate Representation:
Abscissa Resolution: 0.000000002219135986081256
Ordinate Resolution: 0.000000002219135986081256
Planar Distance Units: meter
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:
Overview Description:
Entity and Attribute Overview:
Grid cell values represent the potentiometric surface of the Scollard / Willow Creek hydrostratigraphic unit (HSU), expressed as elevations in metres above mean sea level, Canadian Geodetic Vertical Datum of 1928. Values are floating point data type. Null data are coded '-9999'.
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: 4th 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: 20190402
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: 4th 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