![]() ![]() You'll need to click the that button and select the appropriate transformation to go from TM65 to whichever CRS you chose. When you Ok out or hit apply, you should get a warning that your point layer doesn't match the dataframe with a button called Transformations on it. Set it to WGS84 (or whatever geographic datum/CRS you want to use to generate your lat/long values). Open the dataframe properties, either by double-clicking or right-clicking it in the ToC and go to the Coordinate System tab. ![]() While you're adding fields, add a lat field and a long field using at least float data type. If you move a point via editing, they will not update. Be aware that if they are there or if you calc them, those are now just attributes and have no relation to the point geometry. I think your original XY coordinate columns will be there, but if not you can add two new fields (I'd call them TM65X and TM65Y) to recalculate the values. Be sure to specify the coordinate system as TM65 with either tool to correctly define the coordinate values of the points.ĭepending on how you create them you may need to save the result to a feature class or shapefile for permanence. You can use Add XY Data or as faith_dur suggested in a comment the Make XY Event Layer tool. You cannot merely transpose from longitude/latitude to x/y like that because the world isn't flat.First add your coordinate data to ArcMap. Nice animation of the Mercator projection
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