[OpenLayers-Users] Vector-like feature interaction with large, complex layers

[Eric Lemoine]

On Wednesday, June 3, 2009, Tom B <seileef at gmail.com> wrote:
>
> Hi all,
>
> I've read about a couple of methods (clustering strategy, choosing WFS or
> WMS based on zoom level) for working around the issue of WFS layers being
> unusable for performance reasons when large numbers of complex features are
> involved.  Neither of these are terribly good solutions for our map, though,
> and I wanted to see if anyone had any other ideas of good approaches.
>
> Our map has multiple layers with features that span many scales, and some
> layers have large numbers of complex polygons (e.g. counties of China).
> We'd ideally like to be able to highlight features/labels when the mouse
> hovers over them, and click on a feature to get its info instead of making a
> request to the map server that finds features based on the pixel location.

We often use a mechanism where a request is sent to the server when
the mouse pauses. The server returns the feature, which we highlight
using a vector layer. The


>
> I'm guessing that this isn't doable, given how these interface options rely
> on vector layers, and using vectors for such complex data isn't realistic
> performance-wise.  Using the method of switching between WFS and WMS based
> on zoom level wouldn't really work for us because of the wide variety of
> scales of our features.
>
> Are there any other approaches to this?  It seems like a performance issue
> that just can't be avoided, but maybe there are some creative solutions that
> I'm missing?
>
> Thanks,
> Tom
> --
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>
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-- 
Eric Lemoine

Camptocamp France SAS
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