[OpenLayers-Dev] Making BBOX strategy smarter - part2

Ivan Grcic ivan.grcic at geofoto.hr
Thu Nov 13 06:37:29 EST 2008

...and now when i lowered the ratio on bbox strategy, i can see big
difference in refreshing the data (discarding old ones, fetchin new
Before i didnt see it because it was always fetching data for much bigger area.

So now I can say that bbox strategy works pretty well for me!

On Thu, Nov 13, 2008 at 12:32 PM, Ivan Grcic <ivan.grcic at geofoto.hr> wrote:
> Hi, i just saw that by default bbox has a ratio parameter:2 Creating
> bbox strategy with lower value did a lot of improvement for me, since
> it fetches much less data (filtering it)
> The improvement is off course noticable more on larger scales (zoomed out)
> new OpenLayers.Strategy.BBOX({ratio:1.4}
> Regards, Ivan
> On Thu, Nov 13, 2008 at 12:04 AM, Christopher Schmidt
> <crschmidt at metacarta.com> wrote:
>> On Wed, Nov 12, 2008 at 11:20:00PM +0100, Ivan Grcic wrote:
>>> This post continues on previous discussion opened under name "bbox
>>> strategy and zooming"
>>> OK, I made a little mess here :) Im pretty new with this, so I still
>>> dont know really well how things function.
>>> > Tim says
>>> > Keep in mind that the cluster strategy doesn't know anything about bbox, and vice-versa.
>>> So what  bbox does, is fetching the data, and cluster is then, well
>>> clustering that data? (without getting any new data, cuz thats bbox'es
>>> work)
>>> So on layer pan/zoom, first bbox is activated to fetch, and then
>>> cluster to process. Did i get it right?
>>> Well knowing that, then thers not so much to say about Cluster
>>> strategy. Its allready doing its job pretty well.
>>> Its only about making bbox more efficient, cuz of reasons that
>>> Tim/Christopher said:
>>> Tim said:
>>> > I want to have maxfeatures, and more aggressive invalidation because of it.
>>> Christopher said (thats my case btw)
>>> > Someone else might have a specific need to make the strategy more
>>> > aggressive because the server returns more detailed data based on the
>>> > extent of the request (I don't know, just making things up here).
>> These are actually reversed -- I'm Tim above, and Tim is Me.
>> Regards,
>> --
>> Christopher Schmidt
>> MetaCarta
> --
> Ivan Grcic

Ivan Grcic

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