[mapserver-users] Buffer features?

[Tamas Szekeres]

Steve,

Did you mean to achieve something like?:

LAYER
     CONNECTIONTYPE TRANSFORM
     CONNECTION sourcelayer  # reference to another layer
     NAME transformlayer
     PROCESSING "TRANSFORM=(buffer([shape]))"
     TEMPLATE query.html
     ....
END
LAYER
     CONNECTIONTYPE SHAPE
     DATA myfile.shp
     NAME sourcelayer
     ....
END


Which is simple and easy to implement.

Best regards,

Tamas



2011/2/15 Lime, Steve D (DNR) <Steve.Lime at state.mn.us>

> I’d approach RFC 22, especially the transform piece, differently now with
> the parser changes  implemented in 6.0. We now have (with GEOS enabled) an
> expression syntax available to support things like buffering, convex hull,
> differences, etc… or combinations thereof. I’d implement layer-level
> GEOMTRANSFORMs in that case using these expressions.
>
>
>
> On the query result side of things I’d consider adding a layer template as
> a layer option. This would kinda work like the approach outlined for Bob.
> You’d define a presentation template layer (no DATA value) and run the query
> results through it instead of the regular layer (for certain querymap types,
> e.g. highlight).
>
>
>
> Steve
>
>
>
> *From:* mapserver-users-bounces at lists.osgeo.org [mailto:
> mapserver-users-bounces at lists.osgeo.org] *On Behalf Of *Tamas Szekeres
> *Sent:* Tuesday, February 15, 2011 3:06 AM
> *To:* Bistrais, Bob
> *Cc:* mapserver-users
> *Subject:* Re: [mapserver-users] Buffer features?
>
>
>
> In accordance with the problem mentioned, I recall a resonable enhancement
> as described in RFC22a<http://www.mapserver.org/development/rfc/ms-rfc-22a.html>which would provide an option to configure all the stuff in the mapfile (not
> requiring MapScript) and would make it easier to customize the query maps as
> well.
>
> With this enhancement 2 new layer data providers could be implemented,
> like:
>
> 1. CONNECTIONTYPE=QUERYRESULT would provide to represent the result sets of
> one layer in a new layer.
> 2. CONNECTIONTYPE=TRANSFORM would provide simple geometry transformations
> on a source layer and then provide the modified features as a new layer.
>
> By chaining these layers together in a map configuration we could get such
> results<http://trac.osgeo.org/mapserver/attachment/ticket/2128/sample4.png>as included in the RFC document.
>
> I consider this kind of enhancement could be implemented within the scope
> of 1-2 days of work (comparable with a fully elaborated MapScript solution
> providing the same)
>
> Best regards,
>
> Tamas
>
>
>
> 2011/2/14 Bistrais, Bob <Bob.Bistrais at maine.gov>
>
> This question may have come up before, but I haven’t found it in the
> archives.  I would like to take a selected feature and buffer it to a
> specified distance.  I know it’s possible to do a queryByPoint with a buffer
> distance, but I need to create an actual buffer shape to display on the
> map.  Has anyone done something like this before?  Does MapServer have this
> capability?
>
>
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>
>
>
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