Identification Information:
Citation:
Citation Information:
Originator: Alberta Energy and Utilities Board
Originator: Alberta Geological Survey
Originator: Pawlowicz, J.G.
Originator: Fenton, M.M.
Publication Date: 200410
Title: Drift Thickness of Pelican River Area, Alberta (NTS 83P) (GIS data, line features)
Geospatial Data Presentation Form: vector digital data
Series Information:
Series Name: Digital Data
Issue Identification: DIG0187
Publication Information:
Publication Place: Edmonton, Alberta, Canada
Publisher: Alberta Geological Survey
Description:
Abstract:
The drift thickness map of the Pelican River area (NTS 83P) shows the variation in thickness of unconsolidated sediment lying between the bedrock surface and the present-day land surface, and complements the regional drift thickness map of Alberta (Pawlowicz and Fenton, 1995). The thickness of the drift varies from less than 20 metres in uplands, such as the Pelican Mountains, to a little over 260 metres in the Wiau Valley in the northeast part of the map area. The thickest drift fills the paleovalleys containing the major valleys: the Wiau Valley and the Leismer Valley in the northeast, and the north-trending Amesbury Valley in the central portion of the area.
Purpose: For depicting drift thickness in the Pelican River area (NTS83P) in GIS format.
Supplemental Information:
Petrophysical logs were the primary source of information used for constructing the bedrock topography. A suite of the common well logs (gamma, resistivity, spontaneous potential, density, neutron, sonic and calliper) were useful in making the pick for top of bedrock; however, the gamma and resistivity logs proved to be the most useful. The drift typically displays a lower gamma response and higher resistivity response than the underlying bedrock. Other sources of data were water well lithologs, mineral exploration testholes and information on outcrop locations. Picking the bedrock surface was difficult in some areas where data were sparse. Many of the log traces were absent from the upper part of the hole because of surface casing. The depth of surface casing set in bedrock was used for an estimate of maximum drift thickness in places with few data. Conversely, many water wells did not penetrate deep enough to intersect the bedrock, so only a minimum drift thickness value could be used.
Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date: 2000
Ending Date: 2002
Currentness Reference: process date
Status:
Progress: Complete
Maintenance and Update Frequency: None planned
Spatial Domain:
Bounding Coordinates:
West Bounding Coordinate: -114.00161
East Bounding Coordinate: -111.998512
North Bounding Coordinate: 56.00161
South Bounding Coordinate: 54.999352
Keywords:
Theme:
Theme Keyword Thesaurus:
Theme Keyword: drift thickness
Theme Keyword: bedrock topography
Theme Keyword: buried valley
Theme Keyword: thalweg
Theme Keyword: gis
Place:
Place Keyword Thesaurus:
Place Keyword: 83p
Place Keyword: alberta
Place Keyword: canada
Place Keyword: pelican river
Access Constraints: Public
Use Constraints: Credit to originator/source required. Commercial reproduction not allowed.
Point of Contact:
Contact Information:
Contact Organization Primary:
Contact Organization: Alberta Geological Survey
Contact Person: Information Specialist
Contact Position: Information Specialist
Contact Address:
Address Type: mailing and physical
Address: Alberta Energy and Utilities Board
Address: 4th Floor, Twin Atria Building
Address: 4999-98 Avenue
City: Edmonton
State or Province: Alberta
Postal Code: T6B 2X3
Country: Canada
Contact Voice Telephone: (780) 422-3767
Contact Facsimile Telephone: (780) 422-1918
Contact Electronic Mail Address: eub.ags-infosales@gov.ab.ca
Hours of Service: 8:00 a.m. to 12:00 p.m. and 1:00 p.m. to 4:30 p.m.
Data Set Credit: N.L. Clarke, E. J. Waters
Data Quality Information:
Logical Consistency Report:
The stratigraphic picks used to produce the bedrock surface and drift thickness contours were verified for each data point used. Contouring of the data was first done by a contouring program and then the contour lines were hand edited on the computer to produce the final interpretation.
Completeness Report:
To generate the contour lines of the bedrock surface and drift thickness, data sources included oil and gas wells, water wells and geologic sections along rivers. Data from 1590 points were used. Of these data, 312 were oil and gas well geophysical logs with bedrock pick, 969 were oil and gas well geophysical logs with bedrock above top of well logs, 103 were water well lithologs with bedrock pick, 194 were water well lithologs with depth of bedrock lying below bottom of well, 9 were cross-sections with bedrock outcropping and 3 were cross-sections without bedrock outcrop.
Positional Accuracy:
Horizontal Positional Accuracy:
Horizontal Positional Accuracy Report:
Bedrock contour and drift thickness lines were edited to reflect a valley incision geological model and to honour each data point.
Lineage:
Process Step:
Process Description:
The drift thickness and structure contour of the bedrock surface maps were determined from bedrock stratigraphic picks made from three main sources: oil and gas wells, water wells and outcrops. In oil and gas wells, the bedrock picks were made using geophysical logs. From water wells and outcrop, lithologic decriptions were used to determine the depth to bedrock pick. Picks data were tabulated and imported into a contour mapping software (MacCad v6.0) using a Macintosh desktop computer. The data were then gridded by triangulation using the Delaunay tuple method. The resultant grid was then contoured using the mapping software. The contour lines were then manually edited on the computer using the MacCad software. Next, the final contour lines were gridded again using 400 x 400 grid matrix to produce infill colour rendition. The drift thickness map was finally created by subtracting the bedrock surface grid from a grid of the ground surface topography. The resultant grid was then contoured to create the drift thickness map. Final map preparation was as folows: the bedrock contour and gridded data were exported from MacCad in .dxf format and imported into ArcInfo v8.3. The attributes were deleted. The coverages were transformed from page units to real world coordinates (RMS error +/- 20 m) and projected to UTM12 NAD83. The contour lines were smoothed, tagged with the corresponding elevation/drift thickness values and exported to shapefiles. Map compilation was done using ArcGis v8.3.
Process Date: 2004
Spatial Data Organization Information:
Direct Spatial Reference Method: Vector
Point and Vector Object Information:
SDTS Terms Description:
SDTS Point and Vector Object Type: Complete chain
Point and Vector Object Count: 232
SDTS Terms Description:
SDTS Point and Vector Object Type: Point
Point and Vector Object Count: 4
Spatial Reference Information:
Horizontal Coordinate System Definition:
Geographic:
Geographic Coordinate Units: Decimal degrees
Latitude Resolution: 0.000000
Longitude Resolution: 0.000000
Geodetic Model:
Horizontal Datum Name: North American Datum of 1983
Ellipsoid Name: Geodetic Reference System 80
Semi-Major Axis: 6378137.000000
Denominator of Flattening Ratio: 298.257222
Entity and Attribute Information:
Detailed Description:
Entity Type:
Entity Type Label: drft_83p_ll.aat
Entity Type Definition: Line features
Entity Type Definition Source: Alberta Geological Survey
Attribute:
Attribute Label: THICKNESS
Attribute Definition: Difference in metres between ground elevation and bedrock surface elevation.
Attribute Definition Source: Alberta Geological Survey
Distribution Information:
Distributor:
Contact Information:
Contact Organization Primary:
Contact Organization: Alberta Geological Survey
Contact Person: Information Sales Coordinator
Contact Position: Information Sales Coordinator
Contact Address:
Address Type: mailing and physical
Address: Alberta Energy and Utilities Board
Address: 4th Floor, Twin Atria Building
Address: 4999-98 Avenue
City: Edmonton
State or Province: Alberta
Postal Code: T6B 2X3
Country: Canada
Contact Voice Telephone: (780) 422-3767
Contact Facsimile Telephone: (780) 422-1918
Contact Electronic Mail Address: eub.ags-infosales@gov.ab.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 and Utilities Board/Alberta Geological Survey (EUB/AGS) and its employees and contractors make no warranty, guarantee or representation, express or implied, or assume any legal liability regarding the correctness, accuracy, completeness or reliability of this publication. The data are supplied on the understanding that they are for the sole use of the user and will not be redistributed in any form, in whole or in part, to third parties. 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 EUB/AGS of any manufacturer's product.
Metadata Reference Information:
Metadata Date: 20041130
Metadata Contact:
Contact Information:
Contact Organization Primary:
Contact Organization: Alberta Geological Survey
Contact Person: Information Specialist
Contact Position: Information Specialist
Contact Address:
Address Type: mailing and physical
Address: Alberta Energy and Utilities Board
Address: 4th Floor, Twin Atria Building
Address: 4999-98 Avenue
City: Edmonton
State or Province: Alberta
Postal Code: T6B 2X3
Country: Canada
Contact Voice Telephone: (780) 422-3767
Contact Facsimile Telephone: (780) 422-1918
Contact Electronic Mail Address: eub.ags-infosales@gov.ab.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