I have reprojected a file of global ocean zoning to Winkel III shifting the central meridian to -180 to center it on the Pacific using ArcGIS 10.5. Doing so, a gap at the dateline appears: enter image description here

In a closeup, it's actually a line and a gap: enter image description here

The whole file remains one polygon though. I've tried the Integrate tool but no success. I wonder which tool to use instead, if I am making a mistake regarding the reprojection or if there is any cosmetic fix to make the line disappear (but keep other outlines) in maps?

  • Did you try the Dissolve tool? – FSimardGIS May 1 '18 at 16:45

Normally I use this for a similar looking display issue East-West across the map, but you could try moving the wrap parameter the .prj file. (e.g. +lon_wrap=-180) See wrap parameter explanation here.


I do this by creating a custom projection. Then you should be able to customize/write your own .prj file. See the documentation links for Arc and QGIS below.

Arc link // QGIS Link

  • Thank you for the suggestion. How would I move the wrap parameter? I am not familiar with Python in ArcGIS and cannot open the .prj in any meaningful way either. – Kristina May 11 '18 at 19:40
  • You can always open .prj using notepad and take a look at what's there 👍 – Lisa May 16 '18 at 22:03

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