RE: [MI-L] Complicated Buffer Query

Wed, 15 Mar 2006 13:36:03 -0800

Hi Rich
 
Thanks for the suggestion...I think i see what result that would weild.
 
Unfortunately I forgot to mention that i need to add the individual polygon buffers to their original polygon...
 
so i will end up with a table of polygons that are larger than the original, but only expanded in a direction where there is no other existing polygon.
 
And another added complication is: how do i handle polygons that meet during the buffering process? i guess there's no way to get the buffers to stop when they "meet in the middle"
 
Oh man what a can of worms! where's that lid?!?! AAAARGH!
 
Cheers
 
Mat
 
From: Richard Ashton [mailto:[EMAIL PROTECTED]
Sent: Thursday, 16 March 2006 9:57 AM
To: Apers Mathieu
Subject: Re: [MI-L] Complicated Buffer Query

Hi Apers,

If I understand correctly, maybe a brute force method would do it, i.e. I don't program. If the data set isn't too big, how about buffering all the polys and selecting "one buffer for each object" and save it to a new file. Then erase the original file from it leaving buffers where no poly existed from the original which you can add to a copy of the original. Let me know if I'm out to lunch on this otherwise I hope it helps.

Cheers,
Rich.

Apers Mathieu wrote:

Hi folks

I am confronted with a bit of a problem and was wondering if anybody had any clues as to how I might get around it…

The situation is this:

I have a table with complex polygons that I need to buffer - only I need to maintain any existing boundaries between polygon objects - I can't have any overlaps.

Is there a way to run a complex buffer that does not buffer any line segment that is a boundary between existing polygons?

I had thought of copying my existing table, converting it to polylines and somehow removing all lines that are unique, (theoretically leaving me with only lines that are a boundary between 2 polygons) and using this table as a "cookie cutter" on the standard buffer result, but that will still leave me with loads of "slices" of polygons I will then need to delete… and I'm pretty sure there are other problems with this idea though that I don't even want to think about…

Any help would be much appreciated!

Cheers

Mathieu Apers
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