You could also try to make a rendering transformation for it, see
http://docs.geoserver.org/stable/en/user/styling/sld-extensions/rendering-transform.htmlfor
a start.
So instead of storing the rings in your database you could have geoserver
create them on the fly with a WPS process that's only applied at render
time.
On Fri, Jan 11, 2013 at 10:10 AM, Gabriel Vatin <
gabriel.va...@mines-paristech.fr> wrote:
> **
> True that this kind of buffers is quite good... if you keep the same
> resolution. If you zoom in or out too much, it looses its interest.
> Thanks Stephen for the triggered buffers, it's good to know !
>
>
> On 11/01/2013 15:23, Stephen V. Mather wrote:
>
> Not a bad way to go, doesn't show you the styling but in mapserver. The
> advantage to this approach is you are not recalculating the buffers each
> time. The disadvantage is the same-- they are static, so to change them
> requires creating new geometry in the database.
>
> Here it is in broken (google) English:
>
>
> http://translate.google.com/translate?sl=auto&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&eotf=1&u=http%3A%2F%2Fsimonmercier.net%2Fblog%2F%3Fp%3D1214
>
> Also, I have a pretty old post on this with the buffers created as a
> trigger on insert (probably requires an update trigger as well which is not
> in this example-- also may not be the best plpgsql, so buyer beware):
>
>
> https://smathermather.wordpress.com/2010/05/26/multi-ring-buffers-in-postgis/
>
> Depending on your geometry, this could be quite expensive
> computationally.
>
> Best,
> Steve
>
>
> [image: http://sig.cmparks.net/cmp-ms-90x122.png] Stephen V. Mather
> GIS Manager
> (216) 635-3243 (Work)
> clevelandmetroparks.com <http://www.clemetparks.com>
>
> ------------------------------
> *From:* Gabriel Vatin [gabriel.va...@mines-paristech.fr]
> *Sent:* Friday, January 11, 2013 8:42 AM
> *To:* Chris Haste
> *Cc:* geoserver-users@lists.sourceforge.net
> *Subject:* Re: [Geoserver-users] Polygons with outlines using gradients
>
> Hy Chris,
>
> If you can understand french, I found a tutorial on a blog about this
> question, some weeks ago. As Edward wrote it, you cna do it with buffers,
> and then display it wih different opacities.
> Here is the article : http://simonmercier.net/blog/?p=1214
>
> He creates buffers that do not overlap ("ring" buffers) on the server
> side, and then applie transparency and color with MapServer.
>
> Gabriel
>
> On 11/01/2013 14:34, Chris Haste wrote:
>
> Thank you, Edward.
>
>
>
> I wouldn’t want to end up with the polygon being smaller, so would that
> approach still work if a positive value was used?
>
>
>
> *From:* Edward Mac Gillavry
> [mailto:emacgilla...@hotmail.com<emacgilla...@hotmail.com>]
>
> *Sent:* 11 January 2013 13:24
> *To:* geoserver-users@lists.sourceforge.net
> *Subject:* Re: [Geoserver-users] Polygons with outlines using gradients
>
>
>
> Chris,
>
> My approach would be to use the geometric transformation "buffer" several
> times on the polygon. Using a negative value, you would get polygons
> smaller than the input area. with every transformation you set a different
> colour to achieve a fading line effect, though generated using polygons.
>
> Kind regards,
>
> Edward
> ------------------------------
>
> From: cha...@airdata.co.uk
> To: geoserver-users@lists.sourceforge.net
> Date: Fri, 11 Jan 2013 08:10:38 -0500
> Subject: [Geoserver-users] Polygons with outlines using gradients
>
> Hello all,
>
>
>
> Is it possible to style polygons so that their outline appears as a
> gradient? I’d like to define a coastline, for example, using a line that
> is, say 5 pixels wide, but whose colour fades to transparent. The gradient
> should be oriented with the solid colour closest to the inside of the
> polygon and the lighter colour furthest away from the polygon.
>
>
>
> Not the best explanation, but hopefully you will understand what I mean!
>
>
>
> Thanks
>
>
>
> Chris
>
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