Identification Information:
Citation:
Citation Information:
Originator: Alberta Energy Regulator
Originator: Alberta Geological Survey
Originator: Atkinson, L.A.
Originator: Hartman, G.M.D.
Publication Date: 2017
Title: West-Central Alberta Regional Stratigraphic Model - Bedrock Topography (gridded data, ASCII format)
Geospatial Data Presentation Form: raster digital data
Series Information:
Series Name: Digital Data
Issue Identification: DIG 2017-0015
Publication Information:
Publication Place: Edmonton, Alberta, Canada
Publisher: Alberta Geological Survey
Online Linkage: http://ags.aer.ca/document/DIG/DIG_2017_0015.zip
Description:
Abstract:

This grid dataset is part of the 3D stratigraphic model of west-central Alberta (WCAB). It represents the structure top of the bedrock topography, which provides a well-constrained unconformity across which Paleogene−Quaternary sediments were deposited. This is a significant unconformity surface for shallow modelling studies, as it provides the lowermost surface for modelled Paleogene−Quaternary units, and acts as the bounding surface for Upper Cretaceous−Paleogene bedrock strata that Paleogene−Quaternary units unconformably overlie.

This dataset supplements Alberta Geological Survey (AGS) Report 93, which includes a full description of the process used to produce the bedrock topography grid.

Purpose:
The bedrock topography grid was created to form part of the 3D stratigraphic model of WCAB, which can provide information needed to support land-use planning and management decisions in the shallow subsurface.
Supplemental Information: Language: In English;
Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date: 20150301
Ending Date: 20161231
Currentness Reference: ground condition
Status:
Progress: Complete
Maintenance and Update Frequency: None planned
Spatial Domain:
Bounding Coordinates:
West Bounding Coordinate: -118.72029
East Bounding Coordinate: -115.547216
North Bounding Coordinate: 55.040939
South Bounding Coordinate: 53.409709
Keywords:
Theme:
Theme Keyword Thesaurus: none
Theme Keyword: 3d models
Theme Keyword: bedrock topography
Theme Keyword: boreholes
Theme Keyword: data
Theme Keyword: geology
Theme Keyword: gis data
Theme Keyword: glacial deposits
Theme Keyword: gravel
Theme Keyword: hydrostratigraphy
Theme Keyword: outcrop
Theme Keyword: paleogene
Theme Keyword: surficial geology
Place:
Place Keyword Thesaurus: none
Place Keyword: 83e
Place Keyword: 83f
Place Keyword: 83g
Place Keyword: 83j
Place Keyword: 83k
Place Keyword: 83l
Place Keyword: alberta
Place Keyword: canada
Place Keyword: edson
Place Keyword: fox creek
Place Keyword: hinton
Place Keyword: west central alberta
Place Keyword: whitecourt
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: Hartman, G.M.D.
Publication Date: 2017
Title: 3D Rendering of the Regional Stratigraphy of Paleogene−Quaternary Sediments in West-Central Alberta
Geospatial Data Presentation Form: document
Series Information:
Series Name: Report
Issue Identification: REP 93
Publication Information:
Publication Place: Edmonton, Alberta, Canada
Publisher: Alberta Geological Survey
Other Citation Details: ISBN: 978-1-4601-0170-4
Online Linkage: http://www.ags.aer.ca
Cross Reference:
Citation Information:
Originator: Alberta Energy Regulator
Originator: Alberta Geological Survey
Originator: Atkinson, L.A.
Originator: Hartman, G.M.D.
Publication Date: 2017
Title:
West-Central Alberta Regional Stratigraphic Model - Top of Stratigraphic Unit 1 Within the Paleogene−Quaternary Succession (gridded data, ASCII format)
Geospatial Data Presentation Form: raster digital data
Series Information:
Series Name: Digital Data
Issue Identification: DIG 2017-0010
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: Atkinson, L.A.
Originator: Hartman, G.M.D.
Publication Date: 2017
Title:
West-Central Alberta Regional Stratigraphic Model - Top of Stratigraphic Unit 3 Within the Paleogene−Quaternary Succession (gridded data, ASCII format)
Geospatial Data Presentation Form: raster digital data
Series Information:
Series Name: Digital Data
Issue Identification: DIG 2017-0011
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: Atkinson, L.A.
Originator: Hartman, G.M.D.
Publication Date: 2017
Title:
West-Central Alberta Regional Stratigraphic Model - Top of Stratigraphic Unit 4a Within the Paleogene−Quaternary Succession (gridded data, ASCII format)
Geospatial Data Presentation Form: raster digital data
Series Information:
Series Name: Digital Data
Issue Identification: DIG 2017-0012
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: Atkinson, L.A.
Originator: Hartman, G.M.D.
Publication Date: 2017
Title:
West-Central Alberta Regional Stratigraphic Model - Top of Stratigraphic Unit 4b Within the Paleogene-Quaternary Succession (gridded data, ASCII format)
Geospatial Data Presentation Form: raster digital data
Series Information:
Series Name: Digital Data
Issue Identification: DIG 2017-0013
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: Atkinson, L.A.
Originator: Hartman, G.M.D.
Publication Date: 2017
Title:
West-Central Alberta Regional Stratigraphic Model - Top of Stratigraphic Unit 5 Within the Paleogene-Quaternary Succession (gridded data, ASCII format)
Geospatial Data Presentation Form: raster digital data
Series Information:
Series Name: Digital Data
Issue Identification: DIG 2017-0014
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: Atkinson, L.A.
Originator: Hartman, G.M.D.
Publication Date: 2017
Title: West-Central Alberta Regional Stratigraphic Model - Sediment Thickness (gridded data, ASCII format)
Geospatial Data Presentation Form: raster digital data
Series Information:
Series Name: Digital Data
Issue Identification: DIG 2017-0016
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: Hartman, G.M.D.
Publication Date: 2017
Title: West-Central Alberta Regional Stratigraphic Model - Paleovalley Thalwegs (GIS data, line features)
Geospatial Data Presentation Form: vector digital data
Series Information:
Series Name: Digital Data
Issue Identification: DIG 2017-0018
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: Hartman, G.M.D.
Originator: Smith, D.
Originator: Hughes, A.T.
Originator: Atkinson, L.A.
Publication Date: 2017
Title:
West-Central Alberta Regional Stratigraphic Model - Measured Section Descriptions (NTS 83F, 83K) (tabular data, tab-delimited format)
Geospatial Data Presentation Form: tabular digital data
Series Information:
Series Name: Digital Data
Issue Identification: DIG 2016-0047
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:
Lithological descriptions from the 2015 version of Alberta Environment’s Alberta Water Well Information Database (AWWID) were used to generate stratigraphic assignments to define the bedrock topography modelled grid. Water-well data were considered to be relatively low quality, often containing inaccurate location and lithology data submitted by water well contractors. The data were checked for obvious errors, including incorrect or ambiguous lithological descriptions and anomalous location information. Apparent errors were flagged and compared with higher quality data where it was available, i.e., moderate-to high-quality AGS boreholes and field data, geophysical logs, and previously published geological and hydrogeological maps, interpreted contours, and synthetic data points. Where no higher quality data were available to validate flagged records, the water well data were rejected. Additional information on data quality and the location of higher quality data in the WCAB is available in AGS Report 93.
Logical Consistency Report: The data are in Esri ASCII grid format. NODATA_value for the ASCII grid is coded as -9999.
Completeness Report:
17997 data points of varying quality and coverage were compiled for the construction of the WCAB bedrock topography. The most significant data source was the extensive collection of well records compiled in the AWWID. The AWWID has abundant, relatively low-quality data records, which include location inaccuracies resulting in numerous wells with duplicate locations. In cases of collocated data, water-well records were evaluated on cross-section to consider surrounding data and the accuracy of lithology information contained within the record. This was a manual process to identify the most correct duplicate well litholog to ensure the bedrock topography was delineated properly in real and synthetic data. Water-well records that were not considered to be correct were maintained in a final database, but not used as input for the modelled surface.
Positional Accuracy:
Horizontal Positional Accuracy:
Horizontal Positional Accuracy Report:
x,y coordinates of water wells exported from the AWWID are inexact and typically located to the centroid of a quarter section. The locations were converted to geographic coordinates and were not checked for accuracy.
Vertical Positional Accuracy:
Vertical Positional Accuracy Report:

All borehole data, interpreted contours, and synthetic data were sampled to the 12 m provincial digital elevation model (DEM) to provide a borehole top elevation (m asl) to correlate the bedrock strata between boreholes to create the bedrock topography grid. This process was necessary as the elevation of AWWID water wells, in many cases, was not available/recorded or verified, and if reported was estimated from a topographic map, field investigation or handheld Global Positional System (GPS) device. GPS devices have accuracies reported by the AWWID of ~1-30 m, but are of varying device quality and cannot be assessed for accuracy between devices. Elevation values of moderate-and high-quality data were also checked with the DEM to verify elevation accuracy and modified to match the DEM, if necessary.

Original elevation information for subsurface information that was not sourced from the AWWID (i.e., AGS boreholes and field data, and geophysical logs), was deemed high quality; comparisons were made between the elevation information and the DEM to ensure the correctness of the original elevation information. If the original elevation data from a borehole or field site was approximately the same as the DEM the original elevation information was used. Where original elevation information deviated from the DEM, the DEM value was used at that location.

The vertical accuracy of the 12 m DEM is stated as 5 m @ 90% in the WCAB derived from 1:60 000 aerial photographs using photogrammetric methods.

Lineage:
Source Information:
Source Citation:
Citation Information:
Originator: Alberta Energy Regulator
Originator: Alberta Geological Survey
Originator: MacCormack, K.E.
Originator: Lyster, S.
Originator: Atkinson, N.
Publication Date: 201606
Title: Bedrock Topography of Alberta (gridded data, ASCII format)
Geospatial Data Presentation Form: raster digital data
Series Information:
Series Name: Digital Data
Issue Identification: DIG 2016-0039
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:
Range of Dates/Times:
Beginning Date: 201309
Ending Date: 201503
Source Currentness Reference: ground condition
Source Citation Abbreviation: Provincial scale bedrock topography
Source Contribution:
Interpreted contour and synthetic data points were subsampled from the input data for this grid and used for the WCAB bedrock topography gridded surface.
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: 201411
Source Currentness Reference: ground condition
Source Citation Abbreviation: AWWID
Source Contribution: Water well lithological descriptions.
Process Step:
Process Description:

Methodology to create this grid dataset is fully documented in AGS Report 93.

Modelling software used to create grid: ESRI® ArcMap™ 10.1 (grid interpolation) and Viewlog™ (deterministic alterations)

Number of data points available: 17997

Data sources: A variety of low- to high-quality multisource data were used including borehole and field data, geospatial datasets in GIS format, and interpreted contour and point data from published gridded models. Borehole data consists of lithologs submitted by water well contractors and compiled by the AWWID, downhole geophysical logs collected from water wells, AGS drillholes and field data, as well as industry information.

Interpreted contour and point data were subsampled from the provincial scale bedrock topography, and after being evaluated and compared on cross-section with available borehole data, the contour data were used along with borehole and field data to generate a new bedrock topography for WCAB. Subsampled data include: contour data from published reports, observed bedrock outcrops or bedrock mapped at surface by surficial mapping projects, sediment veneers overlying bedrock, and synthetic control points. Synthetic points were created to constrain the bedrock topography where data was sparse or the complexity of the bedrock topography required further control points to influence the geometry of the modelled surface.

Cross-sections of these data sources were plotted in Viewlog™ to generate stratigraphic picks of the bedrock topography.

Cell Size: 200 m

Process Date: 2016
Process Step:
Process Description:

The Geostatistical Analyst ArcMap extension was used to interpolate the elevation value for the WCAB bedrock topography gridded data. A regional trend surface was modelled from the WCAB bedrock topography data points and removed prior to interpolation. An ordinary kriging algorithm was then used in the ArcMap Geostatistical Analyst extension to interpolate the residual elevation values and create a grid of the structure top of the bedrock surface.

The following Method Report and Prediction Errors provide information about the parameters used to create the grid, and any errors associated with the gridding process.

Method Report:

Method: Kriging

Type: Ordinary

Output type: Prediction

Variogram: Semivariogram

Number of lags: 12

Lag size: 321.48

Nugget: 18.00

Measurement error percentage: 100

Model type: spherical

Range: 2708.16

Anisotropy: No

Partial sill: 374.82

Prediction Errors:

Mean: 0.01

Root mean square error: 11.32

Mean standardized: 0.00

Root mean square error, standardized: 1.10

Average standard error: 10.90

Error exclusion: 0

Number of points excluded: 0

Percent error exclusion: 0

Process Date: 2016
Process Step:
Process Description:

Deterministic Grid Alteration Information:

The regional trend was added back to the residuals to create the final geostatistical layer. The layer file was then extrapolated to cover the full extent of the WCAB model domain and then converted into an ArcGIS ASCII grid file. The grid file was truncated where it contacted the DEM (resampled to a 200 m grid cell size).

Process Date: 2016
Spatial Data Organization Information:
Direct Spatial Reference Method: Raster
Raster Object Information:
Raster Object Type: Grid Cell
Row Count: 878
Column Count: 1008
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 structure top of the bedrock subcrop, expressed as elevation 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: 20170329
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