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Asked: 2026-05-10T13:35:45+00:00

I need to convert latitude/longitude coordinates into Easting/Northing coordinates in the Alberta 10 TM

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I need to convert latitude/longitude coordinates into Easting/Northing coordinates in the Alberta 10 TM Projection.

The 10 TM projection is similar to UTM, but it is a custom projection for the province of Alberta, Canada. I think (with some effort) I could code it myself but would rather not reinvent the wheel if it’s been done already.

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  1. Grab PROJ Cartographic Projections library – open source library.

    Suggested parameters for 10TM:

    +proj=tmerc +lon_0=-115 +k_0=0.9992 +x_0=500000 +datum=NAD27

    According to this post you may need to:

    change the ellps to GRS80 if your 10TM data is referenced to the NAD83 datum (instead of NAD27/clrk66). You may also need to change the false northing (y_0) to be -5000000 if your 10TM coordinates for Alberta are less than 5,000,000 (an AltaLIS "standard").

    I should mention that proj.4 is the library to get for any kind of geographic coordinate system transformation. There’s pretty much no transformation it can’t do.

    I also recommend reading Map Projections-A Working Manual (Paperback) by John Snyder if you are into these kinds of things.. it’s a classic. 🙂 (fixed the link)

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