[OpenLayers-Users] WFS Performance Issues

[Toby R]

Just putting it out there but; Have you thought about clustering?
Toby


On 10 Oct 2011, at 06:55, HughBarker <Hugh.Barker at csiro.au> wrote:

> I'm querying and displaying a WFS service that has (potentially) a huge
> amount of data - thousands of points, updated in real-time.
>
> I'm (not surprisingly) having performance issues when trying to display
> these points in a layer. I'm interested in any suggestions on how to improve
> this.
>
> I prefer to use a WFS over a WMS if possible, primarily because I can only
> use a refresh strategy on a vector layer (the refresh strategy is essential
> for my application). I'm also displaying the underlying data, and while I
> know I can do this on a WMS via GetFeatureInfo, it seems easier in
> OpenLayers when using a WFS.
>
> I've had a couple of thoughts, but I've come a bit unstuck when
> implementing.
>
> 1) Display just the most recent point - the equivalent of this WFS call to
> geoserver:
>
> http://server/geoserver/wfs?service=wfs&version=1.1.0&request=GetFeature&typeName=underway:ss2011_v03&propertyName=position&maxFeatures=1&sortBy=utctime+D
>
> Use the refresh strategy on this layer with a single point, and have a WMS
> to display the other points.
>
> This seems a bit messy, and besides from what I understand openlayers
> doesn't support sortBy.
>
> 2) Fetch and render only a subsample of points based on zoom level and
> bounding box
>
> This seems like a more reasonable solution to me. Ideally I'd like to find
> from experimentation how many points I can render with decent performance on
> my target platforms, then select only this number of points from the server
> - like using maxFeatures, but with a bit more intelligence.
>
> For example, if I'm zoomed all the way out, I don't want to try and render
> 10k points, but maybe only every tenth - whereas if I'm zoomed right in I
> might want to render all points, or some other proportion. And only fetch
> points for features I'm interested in, and that are within the map's current
> bounding box.
>
> I know this is a rather broad question, but any insights would be
> appreciated.
>
> --
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