[Mapbender-users] RE: recommendation for grouping layers

Melchior Moos nimix at gmx.net
Fri Jan 11 11:22:06 EST 2008

Hi Karsten,
The trunk version of TreeGDE2 can already handle grouped layers, so you 
can try that (only for testing) or wait for Mapbender 2.5 which I think 
will have the feature integrated. Unfotunately you can't copy the new 
file to an old mapbender because it depends on changes to map.php.

karsten vennemann schrieb:
> Hi I tried to experiment with both options
> 1. using ConfTreeGde to group layers into folders
> And
> 2. using TreegGde2 and multiple local wms to group layers into different
> folders
> (see also message below)
> I didn't come up with a conclusion yet what is better regarding performance
> ( I have 90 layers and a map file with 5000+ lines), but it seems that
> mapbender is using stacking multiple transparent images on top of each other
> to assemble the map. Is that correct ?
> In that case this could have performance advantages if only switching off
> one group (WMS) during work with the maps and the other wms stay untouched -
> mapserver has to render fewer layers this way when a user switches off
> groups.
> However on the other hand initially loading multiple wms could slow down
> performance initially during the start of the session (compared to option
> 1)? Did anybody ever compare those or has  thoughts on that ?
> Also in the documentation I read about treeGde2 at
> http://www.mapbender.org/index.php/TreeGDE2 : "Group information (nested
> layers) is already available in the database but is not used to display in
> TreeGDE2."
> Is there anybody that tried to accomplish nested layers (one level is enough
> for my purposes) in treeGde2?
> Or could anybody point out what would be involved adding that (I might give
> it a shoot, even being new to mapbender). It sounds that the database
> already has some of the information needed to do that.
> Karsten 
> ---
> From: karsten vennemann [mailto:karsten at terragis.net] 
> Sent: Monday, January 07, 2008 18:05
> To: 'mapbender_users at lists.osgeo.org'
> Subject: recommendation for grouping layers
> Hi,
> in my project only local wms will be used and I wanted  to ask your opinions
> on the best way to do the group of the layers.
> The original map file's (on a MapServer only WebMap) layers are already
> grouped using the MapServer group tags.
> Now on the mapbender wiki I have read that I can use the custom tree to
> organize and group layers. Thus, I thought I could either produce one wms
> and one map file for each group -  or I could stay with one map file and use
> the custom tree to do the grouping.
> Would there be any advantages / disadvantages to either approach (having one
> or multiple wms) ?
> Would I have to expect any differences in performance?
> How does that work anyway with multiple wms ?
> Does mapbender wait for responses from each wms and then assemble one output
> image? or would it be multiple transparent images stacked on each other?
> This really would be interesting to know.
> Thanks
> Karsten 
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