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I am currently trying to generate some lines with a dataset that has points on either side of the Pacific ocean. When I try to generate the line, it creates one long line connecting them through the center of the map, as seen here.

as seen here

I've tried changing the central meridian of the map view, but still end up with this line through the middle. I have a feeling it's something to do with the projection of the points, but I cannot figure out what it is. Unfortunately, I cannot split the dataset into two, as they need to be in one line.

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  • I think this is a fairly standard problem when a line crosses the 180 degree meridian. You're connecting points with a high positive value to points with a high negative value. For example, -179 degrees to +179 degrees, drawn on a graph, is 358 degrees long. Of course, you want it to "shortcut" across the meridian. If you can use, great circle lines instead.
    – Barry Carter
    Commented Aug 25, 2022 at 14:40
  • identify the pair that straddles the date line, add a vertex on the line, then make it multipart. It's actually may be easier to split in two, then Dissolve, but a simple UpdateCursor could fix the features in situ.
    – Vince
    Commented Aug 25, 2022 at 14:41

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For data that crosses the date line I would use PDC Mercator projection which centres on the Pacific Ocean rather than Greenwich meridian.

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  • This worked!! Thank you, it's exactly the answer I was looking for.
    – PintSizeSlash3r
    Commented Sep 15, 2022 at 17:04

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