Abstract: The bedrock topography of Alberta is the surface of the top of Upper Cretaceous and Paleogene bedrock, and reveals geomorphic features created by Paleogene to Recent river systems and Quaternary glaciation. This grid is a computer-generated geostatistical model of the bedrock topography of Alberta using previously published information from Alberta Geological Survey (AGS) maps and reports, as well as new data. The quality of this data has been assessed and then a quality-weighting approach was applied to the dataset prior to interpolation. The surface was modelled using a 500m x 500m grid cell spacing, and as such should not be used for local scale studies. This grid represents the surface portrayed in AGS Map 602, Bedrock Topography of Alberta, and this grid will continue to be updated as part of the Alberta Geological Framework project. Explanatory notes, references, and data sources appear on a supplementary page to accompany Map 602. These notes describe the distribution of physiographic terrain elements of the bedrock surface across Alberta, and the data sources and geostatistical methods used to interpolate this surface.
Metadata:
File identifier:
DIG_2016_0039.xml
Language:
eng; CAN
Character set:
Character set code:
utf8
Hierarchy level:
Scope code:
dataset
Metadata author:
Responsible party:
Organisation name:
Alberta Geological Survey
Position name:
AGS Information Manager
Contact info:
Contact:
Phone:
Telephone:
Voice:
(780) 638-4491
Facsimile:
(780) 422-1459
Address:
Address:
Delivery point:
Alberta Energy Regulator
Delivery point:
4th Floor, Twin Atria Building
Delivery point:
4999-98 Avenue NW
City:
Edmonton
Administrative area:
Alberta
Postal code:
T6B 2X3
Country:
Canada
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.
Role:
Role code:
pointOfContact
Date stamp:
2016-08-23
Metadata standard name:
North American Profile of ISO 19115:2003 - Geographic information - Metadata (NAP-Metadata)
Metadata standard version:
ISO 19115-1.1
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Grid spatial representation:
Number of dimensions:
3
Cell geometry:
Cell geometry code:
area
Transformation parameter availability:
unknown
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Reference system:
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Reference system:
Reference system identifier:
RS Identifier:
Code:
EPSG:3400
Code Space:
http://www.epsg-registry.org/
Version:
8.4.1
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xlink: https://www.ngdc.noaa.gov/docucomp/65f8b220-95ed-11e0-aa80-0800200c9a66 title: North American Datum 1983
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xlink: https://www.ngdc.noaa.gov/docucomp/c3895520-95ed-11e0-aa80-0800200c9a66 title: Geodetic Reference System 1980
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Data identification:
Citation:
Citation:
Title:
Bedrock Topography of Alberta (gridded data, ASCII format)
Date:
Date:
Date:
2016-06-01
Date type:
Date type code:
publication
Cited responsible party:
Responsible party:
Organisation name:
Alberta Energy Regulator
Role:
Role code:
originator
Cited responsible party:
Responsible party:
Organisation name:
Alberta Geological Survey
Role:
Role code:
originator
Cited responsible party:
Responsible party:
Organisation name:
MacCormack, K.E.
Role:
Role code:
originator
Cited responsible party:
Responsible party:
Organisation name:
Lyster, S.
Role:
Role code:
originator
Cited responsible party:
Responsible party:
Organisation name:
Atkinson, N.
Role:
Role code:
originator
Cited responsible party:
Responsible party:
Organisation name:
Alberta Geological Survey
Contact info:
Contact:
Address:
Address:
City:
Edmonton
Administrative area:
Alberta, Canada
Role:
Role code:
publisher
Presentation form:
Presentation form code:
mapDigital
Series:
Series:
Name:
Digital Data
Issue identification:
DIG 2016-0039
Abstract:
The bedrock topography of Alberta is the surface of the top of Upper Cretaceous and Paleogene bedrock, and
reveals geomorphic features created by Paleogene to Recent river systems and Quaternary glaciation. This
grid is a computer-generated geostatistical model of the bedrock topography of Alberta using previously
published information from Alberta Geological Survey (AGS) maps and reports, as well as new data. The
quality of this data has been assessed and then a quality-weighting approach was applied to the dataset
prior to interpolation. The surface was modelled using a 500m x 500m grid cell spacing, and as such should
not be used for local scale studies. This grid represents the surface portrayed in AGS Map 602, Bedrock
Topography of Alberta, and this grid will continue to be updated as part of the Alberta Geological Framework
project. Explanatory notes, references, and data sources appear on a supplementary page to accompany Map
602. These notes describe the distribution of physiographic terrain elements of the bedrock surface across
Alberta, and the data sources and geostatistical methods used to interpolate this surface.
Purpose:
To provide a provincial wide 2.5D grid of the bedrock topography surface providing an update to previous
reconstructions of the bedrock topography of Alberta using geostatistical modelling with a data
quality-weighted approach.
Status:
Progress code:
completed
Point of contact:
Responsible party:
Organisation name:
Alberta Geological Survey
Position name:
AGS Information Manager
Contact info:
Contact:
Phone:
Telephone:
Voice:
(780) 638-4491
Facsimile:
(780) 422-1459
Address:
Address:
Delivery point:
Alberta Energy Regulator
Delivery point:
4th Floor, Twin Atria Building
Delivery point:
4999-98 Avenue NW
City:
Edmonton
Administrative area:
Alberta
Postal code:
T6B 2X3
Country:
Canada
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.
Role:
Role code:
pointOfContact
Resource maintenance:
Maintenance information:
Maintenance and update frequency:
Maintenance frequency code:
unknown
Descriptive keywords:
Keywords:
Keyword:
bedrock
Keyword:
bedrock topography
Keyword:
buried valleys
Keyword:
geology
Keyword:
gis data
Keyword:
numerical modelling
Keyword:
preglacial drainage
Keyword:
preglacial topography
Keyword:
structural
Keyword:
subsurface
Keyword:
thalwegs
Type:
Keyword type code:
theme
Thesaurus name:
Citation:
Title:
none
Date:
unknown
Descriptive keywords:
Keywords:
Keyword:
72e
Keyword:
72l
Keyword:
72m
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73d
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Keyword:
84l
Keyword:
84m
Keyword:
84n
Keyword:
84o
Keyword:
84p
Keyword:
alberta
Keyword:
canada
Type:
Keyword type code:
place
Thesaurus name:
Citation:
Title:
none
Date:
unknown
Resource constraints:
Legal constraints:
Access constraints:
Restriction code:
otherRestrictions
Use constraints:
Restriction code:
otherRestrictions
Other constraints:
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. 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.
Aggregation Info:
AggregateInformation:
Aggregate Data Set Name:
Citation:
Title:
Bedrock Topography of Alberta
Date:
Date:
Date:
2015-01-01
Date type:
Date type code:
publication
Cited responsible party:
Responsible party:
Organisation name:
Alberta Energy Regulator
Role:
Role code:
originator
Cited responsible party:
Responsible party:
Organisation name:
Alberta Geological Survey
Role:
Role code:
originator
Cited responsible party:
Responsible party:
Organisation name:
MacCormack, K.E.
Role:
Role code:
originator
Cited responsible party:
Responsible party:
Organisation name:
Atkinson, N.
Role:
Role code:
originator
Cited responsible party:
Responsible party:
Organisation name:
Lyster, S.
Role:
Role code:
originator
Cited responsible party:
Responsible party:
Organisation name:
Alberta Geological Survey
Contact info:
Contact:
Address:
Address:
City:
Edmonton
Administrative area:
Alberta, Canada
Online Resource:
Online Resource:
Linkage:
URL:
http://www.ags.aer.ca
Role:
Role code:
publisher
Presentation form:
Presentation form code:
mapDigital
Series:
Series:
Name:
Map
Issue identification:
MAP 602
Other citation details:
Scale 1:1000000. ISBN: 978-1-4601-0121-6
Association Type:
Association type code:
crossReference
Aggregation Info:
AggregateInformation:
Aggregate Data Set Name:
Citation:
Title:
Pick Elevations for the Bedrock Topography of the Alberta Plains (tabular data, tab delimited format)
Date:
Date:
Date:
2016-06-01
Date type:
Date type code:
publication
Cited responsible party:
Responsible party:
Organisation name:
Alberta Energy Regulator
Role:
Role code:
originator
Cited responsible party:
Responsible party:
Organisation name:
Alberta Geological Survey
Role:
Role code:
originator
Cited responsible party:
Responsible party:
Organisation name:
Lyster, S.
Role:
Role code:
originator
Cited responsible party:
Responsible party:
Organisation name:
MacCormack, K.E.
Role:
Role code:
originator
Cited responsible party:
Responsible party:
Organisation name:
Atkinson, N.
Role:
Role code:
originator
Cited responsible party:
Responsible party:
Organisation name:
Alberta Geological Survey
Contact info:
Contact:
Address:
Address:
City:
Edmonton
Administrative area:
Alberta, Canada
Online Resource:
Online Resource:
Linkage:
URL:
http://www.ags.aer.ca
Role:
Role code:
publisher
Presentation form:
Presentation form code:
tableDigital
Series:
Series:
Name:
Digital Data
Issue identification:
DIG 2016-0038
Other citation details:
Association Type:
Association type code:
crossReference
Spatial representation type:
Spatial representation type code:
grid
Language:
eng; CAN
Topic category:
Topic category code:
geoscientificInformation
Extent:
Extent:
Geographic element:
Geographic bounding box:
West bound longitude:
-120
East bound longitude:
-110
South bound latitude:
49
North bound latitude:
60
Temporal element:
Temporal extent:
Extent:
Time instant:
Description:
ground condition
Time position:
2015-01-01
Supplemental Information:
Language: In English;
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Feature catalogue description:
Included with dataset:
false
Feature catalogue citation:
Citation:
Title:
Entity and Attribute Information
Date:
Other citation details:
Attributes represent the interpolated elevation of the bedrock subcrop in Alberta.
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Distribution:
Distributor:
Distributor:
Distributor contact:
Responsible party:
Organisation name:
Alberta Geological Survey
Position name:
AGS Information Manager
Contact info:
Contact:
Phone:
Telephone:
Voice:
(780) 638-4491
Facsimile:
(780) 422-1459
Address:
Address:
Delivery point:
Alberta Energy Regulator
Delivery point:
4th Floor, Twin Atria Building
Delivery point:
4999-98 Avenue NW
City:
Edmonton
Administrative area:
Alberta
Postal code:
T6B 2X3
Country:
Canada
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.
Role:
Role code:
distributor
Transfer options:
Digital transfer options:
Online:
Online Resource:
Linkage:
URL:
https://static.ags.aer.ca/files/document/DIG/DIG_2016_0039.zip
Name:
Gridded Data
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Data quality:
Scope:
Scope:
Hierarchy level:
Scope code:
dataset
Report:
Absolute external positional accuracy:
Name of measure:
Horizontal Positional Accuracy
Measure description:
Evaluation method description:
We estimate the recorded well locations are within a 10m radius of their actual locations. The cells of
this grid are 500m on each side, so any horizontal positional error will have little impact on the
accuracy of the grid, considering this is a provincial scale grid and not intended for local scale
studies.
Result:
Quantitative result:
Value unit:
Base unit:
Identifier:
Units system: xlink: http://www.bipm.org/en/si/
Value:
Report:
Absolute external positional accuracy:
Name of measure:
Vertical Positional Accuracy
Measure description:
Evaluation method description:
The vertical positional error in the bedrock topography grid is a function of the quality of the pick set,
including data density, the surface complexity (i.e. topographic variability), and the removal of points
from the pick set that are identified as outliers. The occurrence of errors has been mitigated by
evaluating the quality of the data, applying a quality filter, and then geostatistically evaluating the
data points to identify and remove outliers.
Result:
Quantitative result:
Value unit:
Base unit:
Identifier:
Units system: xlink: http://www.bipm.org/en/si/
Value:
Report:
Completeness commission:
Result:
unknown
Report:
Completeness omission:
Evaluation method description:
Geostatistical techniques were used to identify outlier data points which were excluded from the modelling
process. All high quality data were used to model the bedrock topography surface, however some data
points were removed prior to interpolation during the quality-weighting process.
Result:
unknown
Report:
Conceptual consistency:
Measure description:
The grid was exported as a continuous surface in ArcGIS ASCII grid format. The grid cell spacing is 500m
by 500m, and any grid cells with a null value have been assigned the value -9999.
Result:
unknown
Report:
Non quantitative attribute accuracy:
Measure description:
A stratigraphic pick in a well is a point defined in three dimensions (X, Y and Z).The accuracy of the
pick, either in measured depth from the kelly bushing (KB), or with respect to sea level, is difficult
to quantify. Sources of error include:
- incorrectly recorded well surface or bottom hole location, which results in an error in either X, Y, or
both.
- incorrectly recorded ground or KB elevation, which results in an error in the Z dimension.
- incorrect stratigraphic top pick elevation values, or an incorrectly identified formation result in
error in the Z dimension.
- errors in data entry or data transfer, resulting in errors in X, Y and/or Z values.
Any errors in the initial data points were reduced in the final data set by geostatistical evaluation to
identify and remove outliers.
Result:
inapplicable
Lineage:
Lineage:
Statement:
Geostatistical techniques were used to identify outlier data points which were excluded from the modelling
process. All high quality data were used to model the bedrock topography surface, however some data
points were removed prior to interpolation during the quality-weighting process.
Process step:
Process step:
Description:
Step 1: (Input) The grid representing the elevation at which the uppermost bedrock unit was
encountered and was modelled using pick data compiled from a variety of data sources. These data
were considered to be of variable quality depending on the source from which they were acquired, and
were quality-weighted during interpolation of the bedrock topography surface. This was accomplished
by spatially filtering the data based on data quality. The medium quality data were filtered to
remove all data from this subset that were within 1000m (2 grid cells) of any high quality data
point. The low quality data were filtered to remove any data that was within 2500m (5 grid cells) of
any high or medium quality data point. The quality filtered dataset data were assigned a quality
code of high, medium, or low, and this information is included in the data table for the point
dataset. For areas where there was no bedrock top pick available within 10 kilometers, a control
point was inserted to help constrain the surface during interpolation. For additional information on
the data used to model the bedrock topography, please see page 2 of AGS Map 602.
Step 2: (Modelling the surface) A regional trend surface was modelled from the 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 bedrock
topography 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: 14
Lag size: 900
Nugget: 0.8
Measurement error percentage: %100
Model type: Spherical
Range: 9,500
Anisotropy: Yes
Minor range: 6,000
Direction: 27
Partial sill: 634
Prediction Errors:
Total points: 174980
Mean: 0.02
Root mean square error: 7.41
Mean standardized: 0.00015
Root mean square error, standardized: 1.02
Average standard error: 9.93
Step 3: (Creating the grid)
The regional trend was added back to the residual elevation values to create the final geostatistical
layer. The layer file was then extrapolated to cover the full extent of the province and then
converted into an ArcGIS ASCII grid file.
Date and time:
2015-01-01T00:00:00
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Legal constraints:
Access constraints:
Restriction code:
otherRestrictions
Use constraints:
Restriction code:
otherRestrictions
Other constraints:
Metadata Access Constraints: none Metadata Use Constraints: none
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Maintenance information:
Maintenance and update frequency:
unknown
Maintenance note:
This metadata was automatically generated from the FGDC Content Standard for Digital Geospatial
Metadatastandard version FGDC-STD-001-1998 using the January 2013 version of the FGDC CSDGM to ISO 19115-2
transform.
Metadata author:
Responsible party:
Organisation name:
Alberta Geological Survey
Position name:
AGS Information Manager
Contact info:
Contact:
Phone:
Telephone:
Voice:
(780) 638-4491
Facsimile:
(780) 422-1459
Address:
Address:
Delivery point:
Alberta Energy Regulator
Delivery point:
4th Floor, Twin Atria Building
Delivery point:
4999-98 Avenue NW
City:
Edmonton
Administrative area:
Alberta
Postal code:
T6B 2X3
Country:
Canada
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.
Role:
Role code:
custodian
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