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
<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
*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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