[mapserver-users] Re: WMS and tiles cutting off

[Lime, Steve D (DNR)]

Note that by default I believe openlayers will request an image that is *much* larger than what is visible. Setting the layers (OL) ratio:1 makes it the same size as the view port and that can speed up rendering considerably.

Alternatively you could create a separate set of tiles for each category I suppose and switch OL layers as necessary...

Steve

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From: mapserver-users-bounces at lists.osgeo.org [mapserver-users-bounces at lists.osgeo.org] On Behalf Of Adam Eskreis [aeskreis at gmail.com]
Sent: Thursday, April 29, 2010 2:25 PM
To: mapserver-users at lists.osgeo.org
Subject: Re: [mapserver-users] Re: WMS and tiles cutting off

Ok, I just gave an untiled layer a try, unfortunately though, due to the large amount of symbols being displayed on the screen, there is about a 2 second delay every time the map is panned.  My client will most certainly find this unacceptable.  I have tried using smaller images, but I cannot sacrifice any more quality.  I believe my database query to be as optimized as it can be (has about 50 ms runtime, I honestly don't think I can get it any lower than that).

If these are the only options, is there something else besides WMS that you all would recommend using to solve this issue?

Thanks,
-Adam

On Thu, Apr 29, 2010 at 2:54 PM, Lime, Steve D (DNR) <Steve.Lime at state.mn.us<mailto:Steve.Lime at state.mn.us>> wrote:
So use two layers. One for the background, use tilecache for that. Then use an untiled wms/mapserver layer for the overlayed points. - Steve
________________________________________
From: mapserver-users-bounces at lists.osgeo.org<mailto:mapserver-users-bounces at lists.osgeo.org> [mapserver-users-bounces at lists.osgeo.org<mailto:mapserver-users-bounces at lists.osgeo.org>] On Behalf Of Adam Eskreis [aeskreis at gmail.com<mailto:aeskreis at gmail.com>]
Sent: Thursday, April 29, 2010 1:24 PM
To: mapserver-users at lists.osgeo.org<mailto:mapserver-users at lists.osgeo.org>
Subject: Re: [mapserver-users] Re: WMS and tiles cutting off

I have thought about using tilecache with metatiling, however there is a caveat about this map that i forgot to mention in my main post, and it has to do with that "categories" parameter.  Basically, each point/symbol on the map has an associated category in the database backend.  I am using mapserver/WMS parameters to change the categories which are called.  Each time the user selects a category, only the points in that category are shown.  My query in the mapfile looks something like thi:

SELECT point_geom,gid,symbol,angle FROM mapdata WHERE category IN(%CATEGORIES%)";

And each time the user changes the categories, I use openlayers to merge new parameters, and input the new category values that should be used.  Is tilecache still useable if I have a system like this set up?

Thanks,
-Adam


On Thu, Apr 29, 2010 at 6:14 AM, kaipi <mapcollect at gmx.net<mailto:mapcollect at gmx.net><mailto:mapcollect at gmx.net<mailto:mapcollect at gmx.net>>> wrote:

Hi,

you can use  http://tilecache.org/ Tilecache   with the option metatiling
enabled. With metatiling enabled Tilecache will fetch larger tiles (eg.
4096x4096) from Mapserver and will cut them into smaller tiles (eg.
256x256). It will also increase performance because Mapserver does not need
to render tiles when they are already in cache.

kaipi
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