I'm running arcmap 10.4.1 trying to make a simple outline from a polygon shapefile. Should be a piece of cake, but a small part of the polygon extends off past the dataframe at the default projection. When I reproject with a 180° central meridian to get the entire thing in one piece, arcmap creates a vertical line where the polygon crossed the dataframe by adding extra vertices.

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I can edit these vertices normally such that the line should disappear, but as soon as I deselect the polygon (before I can even save edits) it adds the extra vertices back in!

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Has anyone seen anything like this?

closed as unclear what you're asking by PolyGeo Jul 13 '17 at 22:42

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • in what coordinate system is your polygon ? Did you also change the central meridian of the data or only of the dataframe ? – radouxju Jun 22 '17 at 14:54
  • 2
    Does this link help? desktop.arcgis.com/en/arcmap/10.3/guide-books/map-projections/… – GBG Jun 22 '17 at 15:10
  • That link is very helpful, thanks. The data uses GCS_Mercury (a Plate_Carree projection) and I did only change the meridian of the dataframe. I'll see what can be done about reprojecting the data itself. – JMartin Jun 22 '17 at 15:43
  • Please use the edit button beneath your question to revise it with any requested clarifications. – PolyGeo Jul 5 '17 at 23:13