Shared vertex and other delights...

[Chip.Haynes]

So I've run into an interesting problem on our municipal boundaries layer where a complex polygon (think hourglass shape with the middle pinch-point touching) features a shared or fused vertex at that pinch-point. I've figured out how to make that fusing of vertex happen (move vertex over vertex with the Snap ON), but: Has anyone found a consistant procedure to de-fuse that shared vertex point, allowing you to reconfigure the overall polygon and eliminate the pinch-point?

[Chris.Tolken]

I think the only way to de-fuse two vertices on the same Polyline is to step through it with the PEDIT command. This will place an X at each vertex and then would allow you to move only one of them.

(I assume you are referring to a PLINE as the MUNPOLY object will not allow you to create an hourglass type of polygon using grips.)

[Chip.Haynes]

Thank you, sir!

I've been experimenting with procedures on this one, and have had some limited (random?) luck with splitting a single shared vertex if the line had been created using Draw/Line, but no luck at all if the line was created in Draw/Polyline (without exploding the line and re-joining it). In our actually application, exploding the line is not an option.

As it stands right now, using the "break Line" function under Modify in the upper tool bar menu has produced the desired result, but not consistantly.

Thankfully, there aren't too many shared vetex to deal with on our map layers, but it would be nice to have a set procedure that I knew would work every time. (Or at least every two out of three.)

[Chris.Tolken]

Chip,

What is the source of your data? Is it imported from SHP or DXF or something else?

Depending on the type of objects being created there are different ways to edit them. You can list the object to check the type using the LIST command or checking in the properties palette.

For LWPolylines you can use the PEDIT command.
For MPolygons you can use the MAPMPEDIT command.
And for MunPolygons you have a whole bunch of tools on the Object pull-down menu.

I agree - you dont want to explode them to lines if you dont need to.

[Chip.Haynes]

Right now I'm simply working in a fresh Munsys.dwg file to hash out the procedure. I ran across this issue doing annexation changes to the Pinellas County city limits lines the other day, as some of our cities have very complex limit lines, causing a number of shared/fused vertices. I don't doubt that I will have to deal with this again some time, and I want to be ready.

I willl also freely admit that I'm the new guy here, and have only been working in AutoCAD/Munsys for less than six months, so everything I learn I've been writing down in a book. It's turning in to quite a book.

Can't wait for the movie.

[Chris.Tolken]

No problem - just post on the forum or email us if you get stuck.

[Chip.Haynes]

Thank you, sir- I will.

And if you ever find yourself in downtown Clearwater with nothing to do, stop by the Pinellas County Planning Department's GIS Section and have a look at Munsys in action. I'll give you the fifty-cent tour.