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Data Conversions / Projection Transformation

Due to the curvature of the earth, no single projection can cover the entire planet and still be a viable source for comparing vector data. As a result, vector data is often received in varying projections, which may be converted to a common projection for use. The Alberta Provincial Digital data is stored in either 3TM, UTM or 10TM projections. (See diagrams below)

  • The 3TM projection is used to represent data within three degrees of longitude zone with the 114th degree as a centre.

  Description: Z:\MNOffice\MNC\mnc_Official_web\updated_20110623\images\projections-3tms.jpg

  • The 6TM (or UTM) projection divides Alberta into two zones (UTM Zone 11 and UTM Zone 12) to represent data, six degrees east and west of the 114th degree of longitude.

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  • The 10TM projection completely covers Alberta, running from the 120th degree of longitude to the 110th.

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Return to Data Conversions

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Copyright © Martin Newby Consulting Ltd. 2008

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