![]() Here ff = the fractional part of a decimal degree. (dd + mm/60 +ss/3600) to Decimal degrees (dd.ff)ĭd = whole degrees, mm = minutes, ss = secondsĮxample: 30 degrees 15 minutes 22 seconds = 30 + 15/60 + 22/3600 = 30.2561ĭecimal degrees (dd.ff) to (dd + mm/60 +ss/3600)įor the reverse conversion, we want to convert dd.ff to dd mm ss. Converting Between Decimal Degrees, Degrees, Minutes and Seconds, and Radians Some extremely tiny terms that will not seriously affect meter-scale accuracy have been omitted. Here the USGS publication is the only game in town. In defense of the USGS, their notation is constrained by space, and the need to be consistent with cartographic literature and descriptions of several dozen other map projections in the book.įor converting UTM to latitude and longitude, however, the Army publication has formulas that involve latitude (the quantity to be found) and which require reverse interpolation from tables. Its notation is more consistent and the formulas more clearly laid out, making code easier to debug. Each has advantages and disadvantages.įor converting latitude and longitude to UTM, the Army publication is better. Army Technical Manual TM 5-241-8 (complete citations below). Geological Survey Professional Paper 1395 and U. The two basic references for converting UTM and geographic coordinates are U.S. Also, old World War II era maps of Europe apparently used a single grid for all of Europe and grids in some areas are wildly tilted with respect to latitude and longitude. I saw US military maps of Germany shift their UTM grids by about 300 meters when a more modern datum was used for the maps. ![]() This means that different maps will have different grids depending on the datum used (model of the shape of the earth). UTM grids, on the other hand, are created by laying a square grid on the earth. But there is no way to determine your UTM coordinates except by calculation. If you can see the stars and have a sextant and a good clock set to Greenwich time, you can find your latitude and longitude. Longitude is determined by the earth’s rotation. Latitude is determined by the earth’s polar axis. I get enough inquiries on this subject that I decided to create a page for it.Ĭaution! Unlike latitude and longitude, there is no physical frame of reference for UTM grids. Help! My Data Doesn’t Look Like A UTM Grid! ![]() New! Javascript-Convert Between Geographic and UTM Coordinates Steven Dutch, Natural and Applied Sciences, University of Wisconsin – Green Bayįirst-time Visitors: Please visit Site Map and Disclaimer. You can convert based on the value types you know, and results are delivered at the press of a button, making it worth your while overall.Converting UTM to Latitude and Longitude (Or Vice Versa) Taking everything into consideration, we can state that UTM Converter is a straightforward coordinate conversion tool. ![]() If you want to start over, there’s a dedicated button which clears all fields for you. Note, however, that exporting values is only possible via the keyboard, because there’s no save function. ![]() Each section has dedicated fields, such as latitude and longitude for geo coordinates, as well as X and Y for UTM.Ĭonversion is done at the press of a button. The greater the level of detail, the more accuracy provided. The conversion process is two-way, meaning you can convert either from decimal degrees to UTM coordinates or the other way around, based on the values at hand. This simplicity keeps everything in a clean layout, which is even fitted with a description field for decimal degrees, stating negative values indicate West longitudes and South latitudes. Clean visuals make accommodation easyĪlthough you first need to go through a setup process to make everything work, the application doesn’t make any changes to system registry entries, so you can just as well have it deployed on a thumb drive in case you want to carry it around wherever you go.Īs far as the visual design is concerned, the application puts more focus on making the conversion process easy, rather than offer a stunning visual display. However, there are different types of coordinates, and you might not understand, or need the other type than the one at hand, and this is exactly where UTM Converter comes in handy. Based on coordinates, GPS devices can now guide you anywhere you need to go. Modern technology allowed us to map out every corner of the Earth. ![]()
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