[OpenLayers-Users] How to add many(>400) markers to the map?

[Lehtonen, Mika]

Hi again,
no, I believe you could use sld in this, of course in that case you 
shift to wms. OGC spesification lets you use filters like 
PropertyIsGreaterThan and PropertyIsLessThan and so on, in your sld. 
Though I think there are more sophisticated approaches into this. Some 
people use wms when zoomed out and shift into other methodes when 
zooming in. Hard to suggest anything specific with information provided, 
I am afraid.

But as this is the Openlayers Users list, it might be wiser to move to 
Geoserver list, if you like know more what you can do with it.

- mika -

willson kirjoitti:
>
> Hi,
> if you were using Geoserver and wms, dynamic symbolizer could help you. 
> Check the following out:
>
> http://blog.geoserver.org/2008/12/08/dynamic-symbolizers-part-1/
>
> - mika -
>
>
> willson kirjoitti:
>   
>> Hi,
>> try to search mailing list for strategies, performance. I have the same problem not solved yet. It looks I will have to render at server site.
>>
>> Michal
>>
>>
>> Hi everyone, this is the first post on this forum. I have search the problem on the forum, but find no anwser.
>> What I need to solve is:  I have more than 400 points need to show on the map, these points query my db every 10 secs, and change their color according to the return value. 
>> I use the openlayers.layer.marker to implement, but in ie the markers make the map so slow when zooming.
>> Then I move to  openlayers.layer.vector, but it's even slower than marker.
>> Any suggestion in such "Adding large and dynamically changed markers"  situation?
>>
>>
>>
>>
>> hi, render in serverside(may be wms) can improve the performance much, but how to make markers dynamically change color? Any solution?
>>
>>   
>>     
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>
>
> hi,
> Yes, I am using geoserver and wms. I have look at the link, but it may be not the answer. Since the data in my db change frequently,  and the marker need to reflect these changes. For example , I have a table, and a column named "kpi", when kpi<0.01, the marker's color is green, else is red. It may be not an "sld" issue.
>
>