Hi Andreas,
Here's a good example:
http://openlayers.org/dev/examples/getfeature-wfs.html
The states are drawn as an image from a web map server using the WMS
protocol, in this case GeoServer. The same software also supports WFS,
which returns feature information and its geometry as well. Clicking or
drawing a box generates a WFS GetFeature query and returns features.
The states from the image come from a WMS GetMap request.
So, as you can see, features with their geometries are only returned
when needed to interact with.
You should also take a look at the following example:
http://openlayers.org /dev/examples/getfeatureinfo-control.html
Click on the map, on a water body. You'll see feature information
returned to the right. This is accomplished exclusively using WMS. The
map is an image returned by a WMS server, which makes it fast.
HTH,
[1] http://en.wikipedia.org/wiki/List_of_GIS_software (see Web map servers)
On 12-09-27 03:41 AM, Andreas Schnieders wrote:
Thanks again, but I'm afraid, that won't work for me.
Each 3 of that total number of features are combined to form one
"metafeature" which is selectable and modifiable. On selection further
information is displayed. I don't see, how I would achieve that
through an image of the features?!
Maybe I just don't know the technology to "render" an image from the
feature information on server side (geoserver?). Could you provide an
example documentation or something on that? So I at least could have a
deeper look in the theory.
Kind regards,
Andreas
Message: 4
Date: Wed, 26 Sep 2012 08:24:48 -0400
From: Alexandre Dub? <[email protected] <mailto:[email protected]>>
To: [email protected]
<mailto:[email protected]>
Subject: Re: [OpenLayers-Users] Fastest way to create and frequently
update ~1000 Features
Message-ID: <[email protected]
<mailto:[email protected]>>
Content-Type: text/plain; charset="windows-1252"; Format="flowed"
Hi Andreas,
What Phil meant is that you should switch to a WMS server returning
an image to display your all your features, and if you need to
query or
manipulate them use WFS but only with a small number of features
at a time.
HTH,
Alexandre
On 12-09-26 06:33 AM, Andreas Schnieders wrote:
> Hi,
> >> to those of you being experienced with large numbers of
features: What
> >> do you consider the fastest way to create something around 1000
> >> features and update the every 5 - 60 seconds? Or is there even an
> >> "official" best practice?
> >Large no. of features and KML dont go well together in my
opinion. I
> >would strongly consider using WMS for image, WFS for any query. You
> >might want to see how well your application fits WMS-T.
>
> Thanks! But where exactly would be the benefit of switching from KML
> to GML3 for example? GML is "just" another xml-structure OpenLayers
> would have to evaluate...?
> Or would you recommend switching to JSON-output for WFS? How
would you
> create the features on client-side in that case?
>
> Kind regards,
> Andreas
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Alexandre Dubé
Mapgears
www.mapgears.com
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