[OpenLayers-Users] GisCloud showing tons of vectors features on Web Browser

[Eric Lemoine]

On Thu, Sep 22, 2011 at 2:27 AM,  <christopher.schmidt at nokia.com> wrote:
>
> On Sep 21, 2011, at 5:30 PM, ext Etides wrote:
>
>> Hello,
>>    I  have found today on the web a company named GISCloud  that claim to be able to show millions of vectors features in a Web Browser very fastly using html5 canvas. The demos on their web page seems to confirm what they claim…
>
> I've used thousands of vectors in a *modern* browser without problems in OpenLayers.
> Our canvas support is also reasonably good for things which are static (no
> interaction), and we have some patches for doing fast feature interactions
> on canvas as well.
>
> The problem, as always, is whether you need to support IE. If you do, Canvas means
> going through extcanvas to VML -- and although OL may not be ideal, hundreds of VML
> elements is the limit of that platform.
>
> If you don't care about that -- use Renderer.Canvas, and have at you. OpenLayers
> should scale reasonably well, and if it doesn't, it's likely that simple performance
> improvements -- like support for some kind of more condensed format for passing around
> feature data, simplifying object creation for feature objects, and the like -- can
> expose fairly large wins.

With millions of features we may have issues on the parsing side. In
the GISCloud examples the JSON tiles include pixels, which most
probably makes things faster.

-- 
Eric Lemoine

Camptocamp France SAS
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