[mapserver-users] It takes more than 2 minutes for my map server to generate a world map

[Stephen Woodbridge]

You probably need to run gdaladdo to add reduced resolution overviews of 
you images which will speed up display when you are zoomed way out.

for x in *.tif ; do
   gdaladdo $x 2 4 8 16 32 64 128 256
done

Regardless, to draw the whole world you will need to open all 4659 files 
and fetch something from each one. You can probably speed this up be 
creating a super overlay image at reduced resolution and setup you 
mapfile to use the super overlay when zoomed out and then change to the 
tiles when zoomed in.

Read this might help:
http://mapserver.org/optimization/raster.html

Also the GDAL list will be able to help you on how to create a super 
overlay at reduced resolution.

-Steve W

On 7/28/2011 11:17 AM, Carlos Ruiz wrote:
> JK (?),
>
> One question: did you use gdaltindex ?
>
> IC Carlos Ruiz
>
> *From:* jk <jk.chen at sdl.usu.edu>
> *To:* mapserver-users at lists.osgeo.org
> *Sent:* Wednesday, July 27, 2011 6:20 PM
> *Subject:* [mapserver-users] It takes more than 2 minutes for my map
> server to generate a world map
>
> Hi,
>
> I have a tile system of 4659 tiles, each is a 5 meter resolution raster
> image a particular spot in the world (as you know it is sparse, the
> collection of tiles do not cover the enter world).
>
> When I asking for a map of the world (ie, high-level view, a bbox with
> values close to the lonlat boundary of the world), my map server
> consistently takes long time to finish, (close to 2.5 minutes, yeah,
> minutes, not seconds). This is very slow.
>
> If I submit a bbox that matches a particular tile, the map is returned
> instantly.
>
> How could it take so long to generate the world map?
>
> How to fix that?
>
> Anything I'm missing? Any idea?
>
> I'm not using tile cache yet. But I think 2.5 minutes for world view is way
> too slow. Something must be wrong.
>
> If you know of any clues, let me know.
>
> Thanks for your help.
>
> JK
>
>
> --
> View this message in context:
> http://osgeo-org.1803224.n2.nabble.com/It-takes-more-than-2-minutes-for-my-map-server-to-generate-a-world-map-tp6628127p6628127.html
> Sent from the Mapserver - User mailing list archive at Nabble.com.
> _______________________________________________
> mapserver-users mailing list
> mapserver-users at lists.osgeo.org <mailto:mapserver-users at lists.osgeo.org>
> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>
>
>
>
> _______________________________________________
> mapserver-users mailing list
> mapserver-users at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/mapserver-users