This formula works for all except a few special zones. Here we use a simple mathematical formula to find the appropriate zone for a given longitude value. Zones are longitudinal projection zones numbered from 1 to 60. To eliminate this confusion, and to speed location of points, a zone is sometimes subdivided into 20 zones of Latitude. Is applied separately to the Northern and Southern Hemi sphere, thus within a single zone, a single X / Y pair of values will occur in both the Northern and Southern Hemisphere. The best known use of the transverse Mercator projection is the specialized form called Universal Transverse Mercator () projection system. The application asks you to click locations within a grid zone as specified by randomly generated coordinates. It is frequently used for the production of topographic maps and for georeferencing satellite images (Walker 1993).Īre you ready to try your hand at positioning within a coordinate system grid? The Flash application linked below lets you test your knowledge. This is a projection system based upon the Transverse Mercator projection. Main articles: Universal Transverse Mercator and Universal Polar Stereo graphic. A projected coordinate system that divides the world into 60 north and south zones, 6 degrees wide. Acronym for universal transverse Mercator. If more than one zipper grid line component is required, you must highlight the original zipper component and, using the shortcut (context) menu, add the specific number of zippers required. Zipper grid lines start and stop at the zone boundaries. , Lat/long and State Plane Projection Systems Extract the Spearfish sample data set for GRASS:Ģ. It has become the most used because it allows precise measurements in meters to within 1 meter.ġ. The idea of the transverse mercator projection has its roots in the 18th century, but it did not come into common usage until after World War II. Universal Transverse Mercator Geographic Coordinate System The grid is used commonly in GIS technology in the United States. Is there something simple? Alternately, can someone recommend a good textbook on the different map systems (and conversion principles)?Ī map projection and plane coordinate system based on sixty north-south trending zones, each 16 degrees of longitude wide, that circle the globe. Hi - I was wondering if there was a computationally simple way to produce readings given lat/lon. Novice UTM users usually do not realize that each UTM Zone is in fact a different projection using a different system of coordinates. Use a straightedge that is long enough to draw a line across your map. Start by finding a flat surface to work on. Since many USGS 1:24,000 scale topographic maps do not have grid lines printed on them, you will need to draw them in by hand. As the name suggests, the Universal Transverse Mercator projection is based on the cylindrical Transverse Mercator projection.
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