[OpenLayers-Users] Problem with markers performence

[Robert Buzink]

hi there,

I might be missing the point totally, but if the problem is indeed the
alpha-channel png images of the markers, why don't you just define
jpg-images for the markers in an openlayers cvs file. Drawback is that the
markers have to be square, but hey, square is the next big thing :-).

At least you'll now whether the png's are the problem or the parsing of the
csv-file. Which makes me wonder: is csv parsing faster then xml-parsing,
Christopher?

Robert.

On 1/9/07, Christopher Schmidt <crschmidt at metacarta.com> wrote:
>
> On Tue, Jan 09, 2007 at 12:00:56PM +0530, suneel kota wrote:
> > Hi Christopher, Thanks for ur reply..
> >
> >                I am using IE for displaying the markers.. With out
> parsing
> > the xml file how can i get the latitude and longitude to display the
> markers
> > on the map..
>
> If you are using IE, you are running into limitations in IE's
> implementation of transparent image handling. There is no way to speed
> up the addition of hundreds of alpha-transparent images to the map in
> IE.
>
> >               Is there any other way to display lot of markers on the
> map.
> > I tried using text file and xml file with openlayers api.. Even its
> taking
> > much time..
>
> Yes, it's a limitation of the browser, not your particular method of
> adding the markers. If you were to try it in Firefox, I think you would
> see a much more managable timeframe for adding hundreds of markers --
> though more than 500 is not well supported.
>
> The solution to this may be for you to investigate an imagemap based
> solution to the problem. Others on the list have expressed an interest
> in this type of solution as well -- you might want to look through the
> list archives or send out an email asking if anyone else is interested
> in working on a solution to the problem.
>
> At the moment, OpenLayers does not have a solution for the problem you
> want to solve. If you find a way to solve it, the solution would
> probably be something generally useful, and worth contributing back to
> the core.
>
> Regards,
> --
> Christopher Schmidt
> MetaCarta
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>



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