import shape files with shared boundaries

[Anonymous]

I need to import a shape file with lots of polygons with shared boundaries and also islands etc.

Using mapimport I tried both import polygons as closed polylines ticked and unticked and I do get all the shape to display correctly in CAD.

My problem is that GIS has two overlapping  lines for polygons with shared boundaries, while in CAD we only have a single line representing the border between adjacent polygons. I need to create Topology with the imported polygons and this you cannot do if there are lines on top of each other. I tried to remove them with Drawing cleanup but no lines are removed. 

Any suggestions on how to get rid of the duplicate lines or to prevent them during import?

[braudpat]

Hello

Not sure to well understand your problem / need !?

Please can you share with us your SHP, SHX, DBF, etc (ZIP/RAR please) ?
+ a beautiful Image of your DWG with more details ...

THE HEALTH, Regards, Patrice

[Anonymous]

I have attached the DWG.

If you look at the linework almost everywhere there are 2 lines on top of each other.

I have also done an "explode" command and then "Drawing clean up" to remove the duplicate lines, but no objects were removed.

I want to create topologies, it will not work with the duplicate lines. see jpg or dwg attached.

I generally work in ArcGIS, (so I am not a CAD expert) and only use 3D map for digitizing polygons from geotiff images for seafloor classification. I then create topologies and export to shapefile. In this case I had to go back to CAD to do additional digitizing, but this does not seem so easy.

[Anonymous]

Hi 

I just solved my own problem:

I converted the polygon shapefiles to line shapefiles in ArcGIS before importing into Map 3D.

I can also create a centroid for each polygon in ArcGIS which will already have the correct attribut to assign the layer. 

[braudpat]

Hello

OK so go on with ArcGIS ...

THE HEALTH, Regards, Patrice

[АлексЮстасу]

Try Drawing Cleanup for the original dwg with my settings - polygons.dpf. . (Could only attach with the extension zip).
There is only one error in the topology after it.

[O_Eckmann]

Hi,

To use MAPCLEAN to do the job, you have to add 3 actions

(Sorry for french interface, hope english order of action is the same as french) : 

1st : cut object at intersection (3rd position in list)

2nd : remove duplicate objects (1st position in list)

3rd : connect free node (7th position in list)

You have to execute MAPCLEAN twice with same options before you can create topology without errors.

Olivier

[АлексЮстасу]

---

@O_Eckmann wrote:

Hi,

To use MAPCLEAN to do the job, you have to add 3 actions

(Sorry for french interface, hope english order of action is the same as french) : 

1st : cut object at intersection (3rd position in list)

2nd : remove duplicate objects (1st position in list)

3rd : connect free node (7th position in list)

You have to execute MAPCLEAN twice with same options before you can create topology without errors.

Olivier

---

Probably, "7th position in list", Décomposer les nœuds... - Snap Clustered Nodes? I have this 6th position.

If I do only these three actions, then after twice their launch, the topology creation shows me many errors. Mainly because of Dangling objects or gaps.

[O_Eckmann]

Hi Alexander,

Here is my screencast to proceed from OP drawing with my settings in Mapclean and success of creation of polygonal's topology 

Olivier

[АлексЮстасу]

Hi, Olivier,

Yes, you are absolutely right!
These three actions of yours are really enough!

My mistake was that I decided to use the tolerances not 0.

And this led to unnecessary actions.
As always, when I want to be "too smart"!  🙂