[OpenLayers-Users] Fastest way to create and frequently update ~1000 Features

[Alexandre Dubé]

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? <adube at mapgears.com <mailto:adube at mapgears.com>>
>     To: openlayers-users at lists.osgeo.org
>     <mailto:openlayers-users at lists.osgeo.org>
>     Subject: Re: [OpenLayers-Users] Fastest way to create and frequently
>             update ~1000 Features
>     Message-ID: <5062F410.6040205 at mapgears.com
>     <mailto:5062F410.6040205 at mapgears.com>>
>     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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