topic Make a multipart polygon of touching polygons, not merge in ArcGIS Pro Questions

Make a multipart polygon of touching polygons, not merge

AdrianWelsh — Thu, 03 Oct 2019 18:41:24 GMT

This may not be possible. But, how do you take adjoining polygons, merge them together, but still keep the diving lines (in case you want to dissolve or explode it later)?

This is what I have:

Those selected ones are four separate polygons. I want to make them into a multipart feature without losing the middle lines. Is this possible?

ArcGIS Pro 2.4.1 (or any version, doesn't matter)

Re: Make a multipart polygon of touching polygons, not merge

DanPatterson_Retired — Thu, 03 Oct 2019 18:50:08 GMT

Adrian, dissolve with shared boundaries will remove the boundary.

You could use a very small negative buffer for the shapes, then dissolve creating a multipart polygon.
You could also just create a polyline representation of the shapes (sans attributes) to use to split the dissolved polygons should you need to have them as singlepart again.
Finally, storage is cheap.... just create singlepart and multipart versions of the files

Re: Make a multipart polygon of touching polygons, not merge

AdrianWelsh — Thu, 03 Oct 2019 21:32:02 GMT

Dan, thanks for the reply. What you're saying is that no, there is not a native way to do this, but here are some alternative workarounds. I appreciate the assistance but I wished these solutions worked for what we're looking for!

Re: Make a multipart polygon of touching polygons, not merge

DanPatterson_Retired — Thu, 03 Oct 2019 22:44:59 GMT

and I await the day that a null point doesn't return (0, 0)