Identification Information:
Citation:
Citation Information:
Originator: Alberta Energy Regulator
Originator: Alberta Geological Survey
Originator: Nakevska, N.
Publication Date: 201703
Title:
Total Dissolved Solids Concentration in the Scollard / Willow Creek Hydrostratigraphic Unit in the Calgary-Lethbridge Corridor (gridded data, ASCII format)
Geospatial Data Presentation Form: raster digital data
Series Information:
Series Name: Digital Data
Issue Identification: DIG 2016-0049
Publication Information:
Publication Place: Edmonton, Alberta, Canada
Publisher: Alberta Geological Survey
Online Linkage: http://ags.aer.ca/document/DIG/DIG_2016_0049.zip
Description:
Abstract:

This dataset is part of the regional hydrogeological mapping of the Calgary-Lethbridge Corridor (CLC) in southern Alberta. It represents the concentration of total dissolved solids (TDS) (in mg/L) in the Scollard / Willow Creek hydrostratigraphic unit (HSU) interpolated from wells in Alberta Environment and Parks' (AEP) Alberta Water Well Information Database (AWWID). The TDS concentration was mapped at a regional scale using many years of data, thus providing a good indication of regional water chemistry within the unit rather than site specific values.

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

Purpose:
To provide interpolated data of the total dissolved solids concentration in the Scollard / Willow Creek hydrostratigraphic unit in the Calgary-Lethbridge Corridor.
Supplemental Information: Language: In English;
Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date: 1972
Ending Date: 2001
Currentness Reference: ground condition
Status:
Progress: Complete
Maintenance and Update Frequency: None planned
Spatial Domain:
Bounding Coordinates:
West Bounding Coordinate: -114.194309
East Bounding Coordinate: -112.535228
North Bounding Coordinate: 51.258927
South Bounding Coordinate: 49.074942
Keywords:
Theme:
Theme Keyword Thesaurus: none
Theme Keyword: geology
Theme Keyword: gis data
Theme Keyword: groundwater
Theme Keyword: hydrogeology
Theme Keyword: scollard formation
Theme Keyword: total dissolved solids
Theme Keyword: water chemistry
Place:
Place Keyword Thesaurus: none
Place Keyword: 82g
Place Keyword: 82h
Place Keyword: 82i
Place Keyword: 82j
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: Nakevska, N.
Originator: Liggett, J.E.
Publication Date: 201703
Title:
Calgary-Lethbridge Corridor Water Chemistry Data for Total Dissolved Solids Mapping (tabular data, tab-delimited format)
Geospatial Data Presentation Form: tabular digital data
Series Information:
Series Name: Digital Data
Issue Identification: DIG 2016-0041
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: Nakevska, N.
Publication Date: 201703
Title:
Total Dissolved Solids Concentration in the Paskapoo / Porcupine Hills Hydrostratigraphic Unit in the Calgary-Lethbridge Corridor (gridded data, ASCII format)
Geospatial Data Presentation Form: raster digital data
Series Information:
Series Name: Digital Data
Issue Identification: DIG 2016-0048
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: Nakevska, N.
Publication Date: 201703
Title:
Total Dissolved Solids Concentration in the Horseshoe Canyon / St. Mary River Hydrostratigraphic Unit in the Calgary-Lethbridge Corridor (gridded data, ASCII format)
Geospatial Data Presentation Form: raster digital data
Series Information:
Series Name: Digital Data
Issue Identification: DIG 2016-0050
Publication Information:
Publication Place: Edmonton, Alberta, Canada
Publisher: Alberta Geological Survey
Online Linkage: http://www.ags.aer.ca
Data Quality Information:
Attribute Accuracy:
Attribute Accuracy Report:

The following statistics describe the accuracy of the interpolated final clipped grid in relation to the input TDS point data:

Root mean square error = 442 mg/L

Mean error = -1.5 mg/L

Standard deviation = 444

Maximum error = +879 mg/L / -1915 mg/L

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 TDS concentration map covers an area where the Scollard / Willow Creek HSU exists in the subsurface, and where buffers of 5000 m around the location of the chemical analysis point data were intersecting one another. In cases where the spatial distribution of data allowed for a reasonable interpolation slightly beyond buffered areas, the interpolated surface was extended.
Positional Accuracy:
Horizontal Positional Accuracy:
Horizontal Positional Accuracy Report:
The interpolated grid may have up to 400 m (occasionally 800 m) of horizontal error due to the positional accuracy of the input TDS 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 TDS point data.
Vertical Positional Accuracy:
Vertical Positional Accuracy Report:
See DIG 2016-0041 and AGS Report 91 for details on the vertical accuracy of the input TDS point data, which is affected by the locational accuracy of the wells.
Lineage:
Source Information:
Source Citation:
Citation Information:
Originator: Alberta Environment
Publication Date:
Title: Alberta Water Well Information Database
Geospatial Data Presentation Form: database
Publication Information:
Publication Place: Edmonton, Alberta, Canada
Publisher: Alberta Environment
Source Scale Denominator: 0
Type of Source Media: database
Source Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date: 1901
Ending Date: 201304
Source Currentness Reference: ground condition
Source Citation Abbreviation: AWWID
Source Contribution: water well data
Process Step:
Process Description:

The methodology used to create this grid dataset is documented in AGS Report 91. The AWWID dataset (from which TDS values were sourced) was current up to April 2013.

Step 1 (Modelling the data): An Empirical Bayesian Kriging algorithm was used in the ArcMap Geostatistical Analyst extension to interpolate the TDS values and create a grid of the TDS concentration in 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 TDS was used for the interpolation.

The selection criteria for AWWID chemical analyses used to create this grid are documented in AGS Report 91, and the final selection of wells in DIG 2016-7273.

Method Report:

Method: Kriging

Type: Empirical Bayesian

Output type: Prediction

Transformation: None

Variogram: Semivariogram

Subset Size:100

Overlap Factor:1

Number of Simulations:100

Model type: Standard Circular

Maximum neighbours: 8

Minimum neighbours: 8

Sector Type: 8 Sectors

Angle: 0

Radius: 21020

Total points: 214

Cell Size: 400 m

Root mean square error (considering only final clipped grid): 442 mg/L

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 Formation and 2) the area being outside a buffer area, which consists of areas of contiguous 5000 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: 601
Column Count: 283
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 total dissolved solids in the Scollard / Willow Creek Hydrostratigraphic Unit in mg/L. 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