map performance

[boice tomlin]

Hello users,

The map located here;

http://gisinventory.net/status_maps.html

takes a while to load.  At least at the national view where there is  
a lot of area to render.

I am looking for alternative ways to generate the map that will  
significantly improve performance.

Currently I am using php and looping through data and turning on  
layers as I go.  The PHP part is lightning fast.  But after I get the  
map ready mapserver takes several seconds to generate it.

I'm curious about alternative ways to handle this problem and wonder  
if anyone had comments on any of them.

1) modifying the shape files in some way so the layer information is  
in those files so that all mapserver has to do is load those files  
and not depend on the map files.
2) using a db such as postgres with postgis so that layer information  
is available all in one compact source.

Right now I have to generate a bunch of dynamic classes in PHP using  
the general method below.

		$lyr = $this->ramona_map->getLayerByName("state_yes");
                 $cla = $lyr->getClass(0);
                 $cla->setExpression("/".$expression."/");
                 $lyr->set("status", MS_ON);

I have to do this several hundred times to represent all of the  
data.  The time it takes to generate the map seem proportionate to  
the amount of layers I make visible.  And again this is on the  
mapserver side and not PHP.  PHP does its part of the operation in  
thousandths of a second.

anyone's thoughts are greatly appreciated.

-boice tomlin




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Run Skip
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boice tomlin

boice at runskip.com

503-528-6204


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