Collapsing a polygon into a line

[Tim Rideout]

Here is a question for you all:

 

If you have a road represented as a long narrow polygon is there a way that this can be converted into just a centre line? This is because the user wants to be able to apply appropriate road line styles (e.g. motorway) and you can’t do that when the object is a polygon.

 

Thanks in advance

 

Tim

 

Dr Tim Rideout

Director

 

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[David Reid]

Tim,

 

To simply convert a polyGON to a polyLINE, you can simply select the object(s), pull down menu [Objects] (or right click depending on your setup) and select "Convert to polylines".  There's still clean up left to do as you'll probably have way more polyline than necessary, also, the beginning and end nodes of the product will vary and may show up randomly within the part of the polyline you wish to maintain.

 

IF your given polygon represents say, the surface area of a given "road", where you need to "split the difference" or split equally in two to create a centerline, that would require some trickery and work around manipulation (using the create boundary tool) or call for a tool found in a much later version of MI than I have that can split this polygon as you desire (Mapcad is it called?).

 

 

HTH

David Reid

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From: mapi...@googlegroups.com [mailto:mapi...@googlegroups.com] On Behalf Of Tim Rideout
Sent: Wednesday, December 04, 2013 4:35 AM
To: mapi...@googlegroups.com
Cc: sup...@avenza.com
Subject: [MI-L] Collapsing a polygon into a line

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[Richard Greenwood]

OpenJump has a skeletonize tool.

Rich

Sent from my mobile

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[Tony Pilkington]

This may help to recover the centre-line from a simple buffer.

 

AJP

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[ktgcad]

Select all " Right click" convert to polyline.....

select all combine..

Select all disaggregate..

That solves your problem..

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[Phil Waight (sp)]

Hello,

 

http://www.spatialprojects.com.au/spatialsql_median.htm

 

Don’t know if it still functions with current MapInfo versions, but it will produce median lines between MapInfo objects and inside polygons.

 

 

Regards,

Phil Waight.

 

From: mapi...@googlegroups.com [mailto:mapi...@googlegroups.com] On Behalf Of Tim Rideout

Sent: Wednesday, 4 December 2013 9:35 PM
To: mapi...@googlegroups.com
Cc: sup...@avenza.com

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