[OpenLayers-Users] marker implementation using images ?

[Phil Scadden]

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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