This material updated from The Universal Transverse Mercator Grid, Department of Energy, Mines and Resources Canada, Surveys and Mapping Branch, Ottawa, © 1969, The Queen‘s Printer. To help you understand what topographic maps are and how to use them, see National Topographic System (NTS) and The basics. The important feature of the Universal Transverse Mercator Projection is that the zones are standard and readily identifiable, so that an area may easily be designated as lying within a specific zone. ![]() In the far north, where zones are narrow, medium- and small-scale maps may show parts of more than one zone. By convention, the edges of most maps fall along parallels and meridians. ![]() In Canada this is done to produce the 1:250 000 and 1:50 000 scale maps, which are the two scales of the National Topographic System. These basic sheets are divided further into sections and each section is published as a map of a larger scale. Once the zone has been flattened onto a level surface it can be divided into a basic set of map sheets of a convenient size.
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