MapServer Performance Tips

[Timothy J Nolte]

You should be able to see that I'm already using MINSCALE/MAXSCALE for those
layers as well as others. I'm generating a 1000x700 pixel image. These
layers I don't have showing until the zoom is at around 90 miles. I have
already broken these layers into individual shapes that are smaller than the
states (actually about county size). I'm not really sure that I want to move
these separate layers into one with just class definitions because the
legend does display the class definitions only layers (unless I'm missing
something here with Chameleon). This has all been very helpful information
and I'm going to do my best to take all that has been suggested and work
something out. I'm really wondering if this is a hardware issue. The box is
a Sun server with 4 x 400MHz processors and 4GB ram. That might not be a
powerful enough machine to do what I'm trying to do.

On Tue, 7 Aug 2007 14:16:20 -0500, Fawcett, David
<David.Fawcett at STATE.MN.US> wrote:

>Like Steve says, if the performance is bad when fully zoomed out,
>tileindexes won't help at all.  
>
>If at full zoom-out, the smaller features are not recognizable or
>relevant (e.g. drawing 6 million points on a 100x100 image), think about
>using scale dependency to show a more generalized data layer(s) when
>zoomed out, and your original data when zoomed in beyond a certain
>scale.  
>
>Of course, pre-generating these data layers (as opposed to
>filtering/expression your original data) will lead to the performance
>gain.
>
>You would use MINSCALE and MAXSCALE in the LAYER.
>
>David.