The alternative is to create your own manual formula to do the calculation and perform it on the coordinate attributes (which, btw, aren't actually tied to the geometry - changing those values would not affect the point locations or their projection in any way). This method would be easiest because it's all set up in the software already (and is essentially the proper way to do the conversion you're talking about). So if your points are in UTM, and you reproject them to WGS84, and then field calculate the x and y coordinates, you will get the decimal lat/long coordinates you seek. When I search on net I am getting completely different formulas. What is Convert Lat Long To X Y Z Coordinates. The suggestions to reproject the data are because (at least in ArcGIS, probably in QGIS as well) if you field calculate an x or y coordinate it does so based on the current projection. Search: Convert Lat Long To X Y Z Coordinates. This makes things a bit easier to convert coordinates between, as since they're on the same datum no transformation is required. It just so happens that the UTM projection system also uses WGS84 as the datum. Projected is flat, geographic is 'round'. Online converters Geographic Tools: Coordinate Conversion / Datum Transformation or Convert Geographic Units gave the following answer: Northing 1242142.4, Easting 721103.5, Zone 51. It breaks the earth into 360 degrees along the equator (180 East and 180 West). UTM Zone 60 : Lon Band:174.0->180. WGS84 is properly a datum, but also refers to a geographic coordinate system whose units are degrees. The Latitude/Longitude system is the most commonly known coordinate system. To convert UTM or MGRS coordinates into Lat/Long. They are converted from the lat/long decimal values. UTM and MGRS (NATO UTM ) formats are available for display. Universal Transverse Mercator and Military Grid Reference System. UTM is a projected coordinate system (aka CRS, what I think you mean in your comment) whose units are meters. DegreeMinutesSeconds: N 40 34' 36.552' W 70 45' 24.408' Coordinate System Conversion. Old question, but if you haven't figured it out by now UTM is not a coordinate unit.
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