[OpenLayers-Users] marker implementation using images ?

[Alessandro Ferrucci]

yes I noticed those JSONP requests, and I notice along the payload is the
pixel information of width and height for each feature.. that is how they
know the borders of each box.


On Thu, Jul 7, 2011 at 9:36 PM, Phil Scadden <p.scadden at gns.cri.nz> wrote:

> Look more closely at the Net returns. The GET requests to mapslt?layers
> are the images, but intertwined with that are per tile (I think) calls
> to GET ft?layers which return feature information in JSONP format. You
> could do something very similar by making WFS BBOX queries to return
> features, but you notice that what is being returned obviously has some
> filtering mechanism to limit the no. of features return. (Look at the
> returns for whole world versus a zoomed in part). Your hover mechanism
> to search points runs out of grunt when over 500 features returned
> because they have to be all stored in memory and linearly searched.
>
> You get some sort of thing with vector file in openlayers  (Mapbox does
> it with single layer KML files).
>
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-- 
Signed,
Alessandro Ferrucci
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