Government of Canada: Natural Resources Canada
 
 
Geological Survey of Canada
Calgary

 

 

Introduction
Abstract/Résumé
Citation
References
Metadata
Licence agreement
Cover photo
Acknowledgments
Trademarks

 

 

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.

SPATIAL DOMAIN

Bounding co-ordinates: Geographic co-ordinates (latitude/longitude)

W bounding co-ordinate: -116.00
E bounding co-ordinate:  -115.50
N bounding co-ordinate: 51.75
S bounding co-ordinate: 50.5

 

DATA CREATION ENVIRONMENT

Platform: desktop IBM compatible Personal Computer (PC) 

Operating system: Microsoft Windows XP

Application: ArcSDE 9.3.1

DATA QUALITY INFORMATION

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.

BASE MAP DATA

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

GEOLOGICAL SOURCE DATA

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
Distance measurement units: metres

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.

HORIZONTAL AND VERTICAL POSITIONAL ACCURACY

The accuracies of the source components that originated in the Geomatics Canada digital files and the geological source data digital files were maintained.

POSITIONAL DISCREPANCIES

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.

SPATIAL DATA FILE TYPES

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


.shp - ArcGIS Version 9.3.1 shapefile format containing the data

 

 

GIS MAP SPATIAL DATA FILES

The data are arranged according to the following:              

FILE NAME FILE CONTENTS
Contacts geological contacts
DriftContacts          drift contacts
DriftMapUnits         drift map units
Faults                      geological faults
FaultZones             area of geological faults
Folds                       geological folds
Limits                      mine
Linear                      linear orientation data
MapUnits                geological unit polygons*
MineralLocalities   mineral localities
Planar                     planar orientation data
Sources                  source data areas
Stations                  geological stations

 

 

* 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


DEFINITIONS OF GEOLOGICAL FEATURE ATTRIBUTES

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.