Preface Introduction Getting Started About the CD-ROM Contacts

About the CD: Projections

File and Data Structure
Data Dictionary
Projections
Legend

Projection used for this CD is the Universal Transverse Mercator (UTM) projection. This map projection is the same projection as the basemap that was used to compile the data. The project area lies in 2 UTM grid zones with each zone having a defined central meridian. The map sheets lie in either grid zone 11 or 12. Please see this link to view the index map with the zones of the project area. Originally the data was compiled from 1:50 000 base maps with UTM projections and a datum based on the North American Datum of 1927 (NAD27). The digital data was transformed to a more accurate datum of the North American Datum of 1983 (NAD83). Below is a table summary for the projection defined for each data set:

PROJECTION UTM
UNITS METERS
DATUM NAD83
SPHEROID GRS80
ZONE 11 or 12

 

Transverse Mercator (TM) projection was used for viewing all map sheets together. This required defining a new central meridian that runs along the centre of the project area. The following projection parameters were used to combine both maps from zone 11 and 12. The file using this projection would be under NTSALL directory or it can be conveniently viewed in SurView under the menu item Geology and select View All.

PROJECTION TM
UNITS METERS
DATUM NAD83
SPHEROID GRS80
CENTRAL MERIDIAN: 113° 45'
SCALE FACTOR: 1

 

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Natural Resources Canada GSC  Terrain Sciences Division SE Cordillera NATMAP Project Area