topic Re: 'Ghost' line between polygons after merging in ArcGIS Pro Questions

'Ghost' line between polygons after merging

HanliePetoors — Sun, 11 Feb 2024 06:12:05 GMT

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.

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

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

Re: 'Ghost' line between polygons after merging

MErikReedAugusta — Sun, 11 Feb 2024 06:25:17 GMT

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?

Re: 'Ghost' line between polygons after merging

HanliePetoors — Sun, 11 Feb 2024 16:27:06 GMT

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