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
[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]
Sent: 11 January 2013 13:24
To:
geoserver-users@lists.sourceforge.net<mailto: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<mailto:cha...@airdata.co.uk>
To:
geoserver-users@lists.sourceforge.net<mailto: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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