![]() These lines are standard on all UTM maps. This grid uses as its basic element of identification not squares, as the city map does, but lines. It was requirements such as these which led to the development of the rectangular map grid. Military tacticians also need a more exact system of pin-pointing places on maps. A petroleum engineer, for example, who wishes to describe the location of an oil well on a flat piece of prairie would hardly be satisfied with saying that it is located somewhere within an area covering 25 square kilometres. For most topographic maps, however, many of whose features bear no name, such a system would not be sufficiently precise. This system works fairly well for city and road maps, where the names of streets, cities, etc., are clearly printed. A combination of letters and numbers, such as "B-7", indicates the square formed by the intersection of column B and row 7 it is here that the desired street is to be found. The grid spaces formed by these lines are designated along one margin by letters and along the other by numbers. Such maps are usually divided by vertical and horizontal grid lines. However, due to the divergence of the lines of longitude of the UTM zone from the UTM grid, the width of the zone at northernmost 100,000 metre horizontal grid line (9,200,000 North) is only 80,000 metres.Īt one time or another, most of us have used a city map to find the location of a street. At the equator, the width of the UTM zone is approximately 1,000,000 metres. A UTM zone has a width of 6 degrees of longitude where its maximum width, in distance, is at the equator and its minimum width (zero) is at the North Pole. ![]() Vertical lines of the UTM grid are parallel to the central meridian of the UTM zone and the horizontal lines of the UTM grid are parallel to the equator. ![]() For the UTM grid, basic grid lines are 100,000 metres apart. This diagram shows how the width of the UTM zone changes as compared to constant dimensions of the UTM grid. Figure 1 is an illustration of the 100,000 metre UTM rectangular grid superimposed over a UTM zone. ![]()
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