Avoid overlapped new features

[Anonymous]

Hello guys,

I want to create new features manually to a map layer using “create>new feature>polygon”. I would like to pick the vertices points of each polygon features and then Map 3D would generate this feature. But this polygon feature geometry should not overlap another existing polygon features (see the picture).

I mean, the new polygon feature should exclude existing features areas. The new features vertices should be the red points.

Can I do it with map 3d?

Thanks,

[Anonymous]

Hi Diego,

you can only snap to the vertices when digitizing the new feature. There is no feature in Map which automatically cuts off the overlapping part when creating the new polygon (FDO data).

On side note: when you work with CAD entities you can create a topology in Map. For a polygon topology the lines of adjacent polygons will be shared. That comes close to what you want/need - not needing to digitize shared line features twice. You then can directly export a polygon topology as SHP or whatever you want...

Rob

[Anonymous]

Hello Robert,

Don’t Map 3D have some “avoid intersections” in snapping options? What I am looking for is something like an autocomplete function when creating a feature.

Thanks,

[Thomas_Stuehle]

Hello @Anonymous,

Does the function "Analyze => Feature Overlay => Erase" help you at this point - doing one step more?

Let me know if this solved your issue. If so please dont hesitate to mark this post as solution or let me know if you need any additional help.

[Anonymous]

Hello Thomas,

Maybe it can help but It wasn’t what I was expecting. For increase productivity I would like use it as a topology rule. I mean, I would like to digitalize some polygons and, at real time, it would wipe out the overlapped area from the newest polygon.

We are digitalizing a large area with a large amount of polygons.

The Support Team wrote me and said that this feature wasn’t implemented on Map 3D.

I couldn’t find how to make our task easy. My workaround was install QGis and use this feature there.

Do you have any ideas?

Thank you for your reply.

[Thomas_Stuehle]

Hello @Anonymous

Thank you for your reply.

Did you already try to use the "Visual Basic Editor" or the "Visual LISP Editor". With these options you can create your own functions. Samples for VBA and LISP in Map3D are located here: <Map3D_install_folder>\Sample and you also find other examples/videos on the web.

The function you talked about sounds great. You could post it to the idea-station: http://forums.autodesk.com/t5/autocad-map-3d-ideas/idb-p/90/tab/most-recent

If the function "erase" is a workaround for you, you can accept it as a solution for similar questions in the future.

Best regards,

[parkr4st]

May seem backwards, but draw a polygon over the entire area and use split feature and then you only draw the dividing lines and not the along the edge of the existing polyogns.

before you divide make sure you all the data fields set in the data table so you can edit each split off polygon as you go along

for the sake of display you can use a field to set the original polygon with a different style or even not visible

dave