[geos-devel] left and right buffer

[Martin Davis]

Yes, I know that negative buffer won't doesn't handle left/right - that
suggestion was in answer to Stephen's question about "shrinking"
buffers.

What I'm looking for is some examples of what left/right buffers look
like (especially for pathological cases such as very narrow V shapes)

Martin Davis, Senior Technical Architect
Vivid Solutions Inc.      www.vividsolutions.com
Suite #1A-2328 Government Street Victoria, B.C. V8T 5G5
Phone: (250) 385 6040 - Local 308 Fax: (250) 385 6046


> -----Original Message-----
> From: geos-devel-bounces at geos.refractions.net 
> [mailto:geos-devel-bounces at geos.refractions.net] On Behalf Of 
> zhangjing
> Sent: May 17, 2006 6:28 PM
> To: GEOS Development List
> Subject: Re: RE: [geos-devel] left and right buffer
> 
> 
> Our client need a tool like ArcToolbox Buffer which has 
> functionality of Left/Right/Full buffer, and i believe 
> negative distances could not be applied to polyline geometry.
> 
> Thanks. 
> 	
> 
> 
> 
> >Am I missing something?  Isn't this the functionality that negative 
> >buffer distances gives today?
> >
> >Martin Davis, Senior Technical Architect
> >Vivid Solutions Inc.      www.vividsolutions.com
> >Suite #1A-2328 Government Street Victoria, B.C. V8T 5G5
> >Phone: (250) 385 6040 - Local 308 Fax: (250) 385 6046
> >
> >
> >> -----Original Message-----
> >> From: geos-devel-bounces at geos.refractions.net
> >> [mailto:geos-devel-bounces at geos.refractions.net] On Behalf Of 
> >> Stephen Woodbridge
> >> Sent: May 17, 2006 10:06 AM
> >> To: GEOS Development List
> >> Subject: Re: [geos-devel] left and right buffer
> >> 
> >> 
> >> Hi Martin,
> >> 
> >> I think a useful variant of this for polygons it to be able
> >> to specify 
> >> inside or outside, so you could effectively grow and shrink 
> >> the polygon.
> >> 
> >> The "grow" option is great for finding abutters, and I think
> >> the buffer 
> >> command today already does this.
> >> 
> >> The "shrink" option is great for defining/showing boundary offsets
> >> within a lot that might be needed to insure zoning rules.
> >> 
> >> -Steve
> >> 
> >> Martin Davis wrote:
> >> > I'm curious what your use case is for this 
> functionality.  Can you
> >> > post some sample data that you want L/R buffers for, and 
> perhaps an 
> >> > image of what you expect the results to look like?
> >> > 
> >> > Martin Davis, Senior Technical Architect
> >> > Vivid Solutions Inc.      www.vividsolutions.com
> >> > Suite #1A-2328 Government Street Victoria, B.C. V8T 5G5
> >> > Phone: (250) 385 6040 - Local 308 Fax: (250) 385 6046
> >> > 
> >> > 
> >> > 
> >> >>-----Original Message-----
> >> >>From: geos-devel-bounces at geos.refractions.net
> >> >>[mailto:geos-devel-bounces at geos.refractions.net] On Behalf Of
> >> >>zhangjing
> >> >>Sent: May 17, 2006 12:10 AM
> >> >>To: geos-devel at geos.refractions.net
> >> >>Subject: [geos-devel] left and right buffer
> >> >>
> >> >>
> >> >>hi,
> >> >>
> >> >>Is there any way in GEOS to calculate geometry's left or right 
> >> >>buffer ?
> >> >>
> >> >>TIA
> >> >>Jing Zhang
> >> >>
> >> >>	
> >> >>
> >> >>
> >> >>
> >> >>_______________________________________________
> >> >>geos-devel mailing list
> >> >>geos-devel at geos.refractions.net 
> >> >>http://geos.refractions.net/mailman/listinfo/g> eos-devel
> >> >>
> >> > 
> >> > _______________________________________________
> >> > geos-devel mailing list
> >> > geos-devel at geos.refractions.net
> >> > http://geos.refractions.net/mailman/listinfo/geos-devel
> >> > 
> >> 
> >> _______________________________________________
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> >> 
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> >http://geos.refractions.net/mailman/listinfo/geos-devel
> 
> 
> 
> 
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