Modified transverse Mercator
The modified transverse Mercator (MTM) coordinate system is a metric grid-based method of specifying locations, similar to the Universal Transverse Mercator coordinate system (UTM). MTM uses a transverse Mercator projection with zones spaced 3° of longitude apart.
The coordinate system is used by various government institutions in Canada in particular.[1][2][3]
Due to its narrower zones, MTM exhibits a scale factor of 0.9999 (distortion of 1:10,000) in the midpoint of a zone, versus 0.9996 (1:2,500) for UTM. This makes it more suitable for land surveying, with its target maximum distance (closure) error of 1:5000.[4]
References
[edit]- ^ "Projections". CGRSC.ca. Canadian Geodetic Reference System Committee. Retrieved 16 October 2025.
- ^ "Carte du Québec: Systèmes de projection" (PDF). Ministère des terres et forêts du Québec. Retrieved 16 October 2025.
- ^ "Converting between UTM, MTM, and lat/long". CanadianGIS. Retrieved 16 October 2025.
- ^ "Technical support: Projections in Nova Scotia" (PDF). GeoNOVA. Retrieved 16 October 2025.
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