[geos-devel] left and right buffer

[zhangjing]

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
>> >>
>> >>	
>> >>
>> >>
>> >>
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>> >>
>> > 
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>> 
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