[OpenLayers-Users] IE strategies

[Yves Moisan]

> 
> See the ratio property of the BBOX strategy. You may want to set it to 1 
> (the default is 2, which means it will request a bbox twice as large as 
> the viewport).

Thank you.

> > 
> > http://www.flickr.com/photos/30818159@N05/3182451587/ shows BBOX +
> > Cluster maxFeatures = 200 on the left (results in 101 features) and
> > maxFeatures = 10 on the right (results in 9 features ???).  There
> > clearly should be 10 features returned.
> 
> This obviously has to do with the ratio property mentioned above: 
> maxFeatures applies to the bbox requested from the server, which is 
> twice as large as the visible viewport (if using the default ratio of 2).

I see now.  One of the features was returned in the portion outside the
viewport and obviously not clustered in the display.  I forced ratio to
1 and I now see the expected behaviour.  This problem is likely to
manifest itself when maxFeatures is small so it can be tricky.

May I ask why ratio defaults to 2 ?  Is it a matter of minimizing calls
to the server for small pan moves ?  I believe most users will be
puzzled by not seeing N = maxFeatures in the viewport when they know
there are features.  

Thanx again for your explanations.

Yves