Kent, D.M.
Christopher, J.E.
2008
Sweetgrass Arch and Williston Basin Tectonic Elements (GIS data, line features)
v. 2
vector digital data
Digital Data
DIG 2008-0310
Edmonton, Alberta, Canada
Alberta Geological Survey
http://www.ags.gov.ab.ca/publications/DIG/ZIP/DIG_2008_0310.zip
The Geological Atlas of the Western Canada Sedimentary Basin was designed primarily as a reference volume documenting the subsurface geology of the Western Canada Sedimentary Basin. This GIS dataset is one of a collection of shapefiles representing part of Chapter 27 of the Atlas, Geological History of the Williston Basin and Sweetgrass Arch, Figure 5, Sweetgrass Arch and Williston Basin Tectonic Elements. Shapefiles were produced from archived digital files created by the Alberta Geological Survey in the mid-1990s, and edited in 2005-06 to correct, attribute and consolidate the data into single files by feature type and by figure.
For incorporating Atlas data into a Geographic Information System at a regional scale.
In English.
1994
source publication date
None planned
-112.877098
-101.516477
53.033847
46.409155
None
geology
gis data
western canada sedimentary basin
ISO 19115 Topic Category
geoscientificInformation
None
72e
72l
72m
73d
73e
82h
82i
82p
83a
alberta
canada
western canada
Public
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.
Alberta Geological Survey
Publications and Marketing Advisor
Publications and Marketing Advisor
mailing and physical
Alberta Energy Regulator
4th Floor, Twin Atria Building
4999-98 Avenue NW
Edmonton
Alberta
T6B 2X3
Canada
(780) 422-1927
(780) 422-1918
AGS-Info@aer.ca
8:00 a.m. to 12:00 p.m. and 1:00 p.m. to 4:30 p.m.
A. Lytviak, E.J. Waters, N. Blundon, K. Miller, N. Crann
ESRI ArcCatalog 9.0.0.535
This shapefile may contain overlaps and gaps between what are intended to be logically contiguous polygons. Where gaps were larger than approximately 100 m, polygons were edited to snap shared boundaries together. However, not all gaps and overlaps were corrected. Logical inconsistencies are also known to exist among datasets from different chapters of the Atlas itself. For example, stratigraphic surfaces may intersect or overlap incorrectly; stratigraphically lower horizons crop out above certain units, and vice versa. This is a function of different authors of the Atlas modelling their data in isolation from others, and no attempt was made by the Alberta Geological Survey (AGS) to correct these types of deficiencies.
The Geological Atlas is a study of the Western Canada Sedimentary Basin based upon a well density of one well per Township (36 square miles or 93 square km). Users are encouraged to consult relevant parts of the Atlas to obtain specific methodology information for datasets of interest.
This dataset is part of a regional study covering nearly one and a half million square kilometres. Accordingly, the data should only be used to provide geological context information at a regional scale. Figures from different chapters of the Atlas were prepared by different authors, and no effort has been made by AGS to distinguish which shapefiles may be of greater or less relative positional accuracy. We estimate that the relative positional accuracy averages +/- 10 km for the files. This estimate does not take into account the accuracy of the original works, which have not been quantified.
Data were archived in digital form by AGS, in geographic coordinate-based ascii files. The files were reformated into ArcGenerate ascii files, using the ID field for the elevation attribute, then converted to shapefiles using FME 2002. An elevation field was created and the ID field was copied over then dropped. Shapefiles were shifted from NAD27 to NAD83 using FME 2002, which references the NTv2 grid file. All processing was done in batch mode.
2003
This file was generated as part of a batch of 349 shapefiles that were deemed to be of interest for conversion to GIS format. 188 figures/maps are represented by these shapefiles. Source data for the batch conversion project were in one of three types: 1) georeferenced digital ASCII files previously converted into shapefile format; 2) non-georeferenced, graphics format (.wmf); and 3) paper maps. Type 1 shapefile data were checked for completeness of line and polygon features, edited, then attributed with the figure title and individual feature descriptions given in the map legends. Type 2 data followed the same workflow as Type 1, except that the figures were first converted to DXF format then transformed using ArcInfo into real-world coordinates. The relatively few maps of Type 3 were scanned into image format, digitized in heads-up mode, then handled the same as Type 2 data. A quality-checking system was used to track the status of each figure and file as the work proceeded. Check plots of each map at the respective source map scale and projection and were compared to originals by the supervising geologist (M. Grobe). Errors were flagged and subsequently corrected. Once the data had been thoroughly checked, the shapefiles were projected into geographic coordinates, NAD 83 datum. ArcMap layer files were created to render the shapefile data as they appear in the Geological Atlas. This step served to further the quality control for the data. Minor edits were required to about 10 shapefiles in order to symbolize them as they appear in the Atlas.
2006
Vector
Simple
FALSE
0
FALSE
FALSE
North_American_Datum_1983
Geodetic Reference System of 1980
6378137.000000
298.257222
fg2705_ln_ll
Shapefile attributes
Alberta Geological Survey
Feature Class
0
FID
FID
OID
4
0
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Shape
Geometry
0
0
0
Feature geometry.
Esri
Coordinates defining the features.
ID
AGS unique ID
Alberta Geological Survey
Free text
ID
Double
19
0
0
MAP_NAME
Map or figure title
Alberta Geological Survey
Free text
MAP_NAME
String
254
0
0
DESCR1
Feature description
Alberta Geological Survey
Free text
DESCR1
String
254
0
0
DESCR2
Detailed feature description
Alberta Geological Survey
Free text
DESCR2
String
254
0
0
Shape_Leng
Shape_Leng
Double
19
0
0
Attributes encapsulate the title and legend details of the figure.
Alberta Geological Survey
Publications and Marketing Advisor
Publications and Marketing Advisor
mailing and physical
Alberta Energy Regulator
4th Floor, Twin Atria Building
4999-98 Avenue NW
Edmonton
Alberta
T6B 2X3
Canada
(780) 422-1927
(780) 422-1918
AGS-Info@aer.ca
8:00 a.m. to 12:00 p.m. and 1:00 p.m. to 4:30 p.m.
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.
20131107
Alberta Geological Survey
Publications and Marketing Advisor
Publications and Marketing Advisor
mailing and physical
Alberta Energy Regulator
4th Floor, Twin Atria Building
4999-98 Avenue NW
Edmonton
Alberta
T6B 2X3
Canada
(780) 422-1927
(780) 422-1918
AGS-Info@aer.ca
8:00 a.m. to 12:00 p.m. and 1:00 p.m. to 4:30 p.m.
FGDC Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
none
none
Esri ArcGIS 13.1.2.41833
Williston_Basin_Tectonic_Elements_Unknown_structure
Williston_Basin_Tectonic_Elements_Unknown_structure
002
0.000
Projected
GCS_WGS_1984
Linear Unit: Meter (1.000000)
WGS_1984_Web_Mercator_Auxiliary_Sphere
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