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Introduction |
DATA DESCRIPTION TITLE
Geology, Tangle Peak, British Columbia FEATURE TYPE AND LOCATION INFORMATION Points, lines,
polygons, and attributes representing the geology of the area covered by
NTS map 82-J/12 in southeastern British Columbia. Bounding co-ordinates: Geographic co-ordinates (latitude/longitude) W bounding
co-ordinate: -116.00
DATA CREATION ENVIRONMENT Platform: desktop IBM compatible Personal Computer (PC) Operating system: Microsoft Windows XP Application: ArcSDE
9.3.1 Recently observed
geological stations were positioned using uncorrected GPS NAD83
co-ordinates whereas historical data locations were not revisited.
Compilation was based on the positions of the stations. Source: National Topographic Data Base (NTDB) vector data type; topographical contours and hydrography Projection: Universal Transverse Mercator, Zone 11U Horizontal datum: North American Datum 1983 Vertical datum: mean sea level Scale: 1:50 000 Distance measurement units: metres Data file format: shapefile Source producer: Government of Canada, Natural Resources Canada, Centre for Topographic Information Data acquisition date:
1985 Vector data type; geological contacts, faults, folds and orientation data points Projection: Universal Transverse Mercator, Zone 11U Horizontal datum: North American Datum 1983 Vertical datum: mean sea level Scale: 1:50 000 Elevation units: metres Production media: paper Source producer: Geological Survey of Canada - Calgary
LINEAGE Geological data were
compiled from field inspection and reinterpretation of pre-existing
maps. The accuracies of the
source components that originated in the Geomatics Canada digital files
and the geological source data digital files were maintained. This map may contain
discrepancies between feature positions located using an older
topographic base and feature positions determined by more recent (GPS)
measurements. Inconsistencies (locally in excess of 100 m) have been
resolved by creating a thematically consistent map (consistency between
geology and topography), while maintaining the spatial accuracy of the
outcrops (where located by GPS points). This may result in apparent
errors between the outcrop locations and the positions of the geological
contact lines. Every effort has been made to reduce these discrepancies,
while maintaining the accuracy of all source data. The GIS map information is provided in the following file types:
.xml - ArcGIS Version 9.3.1 XML format containing the schemas used to create the correspondingly named geodatabase feature classes
GIS MAP SPATIAL DATA FILES The data are arranged according to the following:
* Map unit descriptions frequently exceed the allowable 256 character limit of shapefiles and are therefore listed separately in the Microsoft Excel spreadsheet: DATA\XLS\CGM_0012_MapUnits.xls
Surface bedrock data are organized into feature classes and themes consistent with logical groupings of geological features. All field observation point data are related through the Station_ID property of the Station theme. These feature attribute names and definitions are identical in the shapefiles and the XML files.
Complete description of the feature classes and feature attributes are contained in the text file: DOC\RTF\Bedrock Mapping Geodatabase Data Model v2.2.rtf
Attribute domains (pick lists) are contained in the text file: DOC\RTF\Bedrock Mapping Geodatabase Domains v2.2.rtf
The Bedrock Data Model and the Bedrock Domains documents are intended to describe all bedrock features which may be compiled at the 1:50 000 scale. Therefore, some of the feature classes and feature attributes described in these documents may not be present in the map contained on this CD-ROM. |
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