MTM Notes

The following image shows the MTM zones as provided by this tool for the eastern portion of Canada. Starting with zone 14, things are regular all the way west to zone 32. I believe the zones here matched the definitions in NRCan's earlier tool GSRUG online tool (Feb 2008 version -- this tool is now replaced by TRX). The triangles show the position of the reference meridian and the zone number. My current (2015) understanding is that there is no formal definition of MTM zones in Canada. The map below would perhaps represent common usage, but nothing more (and in particular, no formal definition). In other words, the same lat/lon could be in one MTM zone (ie. use a given central meridian) in one application, and in a different MTM zone in another.

Zones up to 11 are part of the series that spans Quebec (center meridian on half degree, zone 11 centered on W82.5). Zones from 12 onwards are part of the series that spans the Prairies (with center meridian on a degree, zone 12 centered on 81.0). And indeed, zone 12 backtracks from zone 11 which is really strange. So in many cases, an explicit center meridian would be needed as explained below.

[MTM zones in Canada]

This page was generated with GPS Visualizer, using these tracks as input, and the following options: width=1100, fullscreen (?), trackOpacity=100, trackWidth=1, waypointStyle=smallTriangles, permanentLabels.

There are two discontinuities in zones, which can be grouped as follows:

To cover problem cases, where the above MTM definitions here don't match your needs, the reference meridian can be explicitly provided when converting to/from MTM. Right now, the false easting cannot be changed, but if there is need, I could add this too. I don't think MTM makes sense on water.

Some specific notes that I have:

Other provices do not appear to use MTM zones.

Another view of MTM zones from www.posc.org.

Comments/corrections most welcome:  (français, English, Deutsch).