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'Ghost' line between polygons after merging

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02-10-2024 10:12 PM
HanliePetoors
Frequent Contributor

Hi,

I'm working on Windows 10, ArcGIS Pro 3.2.2 in a file gdb.

After merging two polygons I get this 'ghost' line between the two previous polygons. In the illustration below I have merged only one polygon.

HanliePetoors_0-1707631698332.png

When I identify or select I get the whole polygon but the ghost lines are still visible:

HanliePetoors_1-1707631780793.png

I've run repair geometry on the feature class but that fixed nothing.

Anyone come across this before? What do those ghost lines mean and how do I get rid of them?

Thanks

Hanlie

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The first thing I can think to troubleshoot is to hit "Edit Vertices" and see what you get.

This almost looks like it's being stored as a multi-part polygon that happens to be contiguous.

 

Quick fix, you can delete the offending vertices if they are there.  But the bigger issue is likely in the base dataset: Did you allow multipart polygons?  Should you have?  Is there some other reproducible bug?

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M Reed
"The pessimist may be right oftener than the optimist, but the optimist has more fun, and neither can stop the march of events anyhow." — Robert A. Heinlein, in Time Enough for Love

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2 Replies

The first thing I can think to troubleshoot is to hit "Edit Vertices" and see what you get.

This almost looks like it's being stored as a multi-part polygon that happens to be contiguous.

 

Quick fix, you can delete the offending vertices if they are there.  But the bigger issue is likely in the base dataset: Did you allow multipart polygons?  Should you have?  Is there some other reproducible bug?

------------------------------
M Reed
"The pessimist may be right oftener than the optimist, but the optimist has more fun, and neither can stop the march of events anyhow." — Robert A. Heinlein, in Time Enough for Love
HanliePetoors
Frequent Contributor

Hi @MErikReedAugusta ,

You're right, I could fix the problem by editing the vertices and deleting the ones that were causing the 'ghost' lines.

I think the original polygons had slight gaps or overlaps and that is what caused the problem. The original was supplied by a client and so I'm not in control of how they created that. 

Good lesson for the future: check first for slivers/gaps!

Regards

Hanlie

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