Stephen Kelly wrote:
Alexandra,
Hi, if you are really interested we have developed a tool here to create tiles for one of our mapping tools, and we generate about 100,000 very large mapserver maps per day and it would be easy for us to do some timing tests for you of both ways and to see which way is the fastest.
I use the TIGER 2008 data. Do you use it in one of your maps ?
One thing we have discovered is that what you do to your shape files is
generally more important for speed, than what you do to your map files.
Right. Could you give me some examples of what you do ? One thing I do
is generalize my shapes and merge them together per state to have a
faster map a lower scales. Do you do the same for each of your scale
level ?
We use KaMap to tile our map for each zoom level, so in the end we have
a fast map but it sure takes some to cache the whole tiles.
Although we do not rely on min/max scale and choose manually at what zoom what
information is shown, and have that in separate map files, as that is the
fastest (for what we need to do).
I always edit my mapfiles manually, so having 11 instead of one seems
like a lot of maintaining work, but I'm interested to hear more if
you're willing...
If you have any specific data / map files that you wanted me to test it on- I
am sure that we could accommodate that.
That's very kind of you, but I must decline the offer. I can't share
the actual mapfile, sorry.
We can do 16,000 images one way, 16,000 the other way and time each image and
see which way works.
Thanks
Thanks to you,
Alexandre
Stephen Kelly
www.Peepel.com
-----Original Message-----
From: mapserver-users-boun...@lists.osgeo.org
[mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of Alexandre Dube
Sent: Friday, 12 June 2009 11:21 PM
To: MAPSERVER USERS
Subject: [mapserver-users] Multi layer/class : performance
Hi,
I wonder which of theses two cases is better :
CASE 1 : Multi layer :
Define one layer per scale with minscale and maxscale, each having one
set of classes.
CASE 2 : One layer :
Define one layer only with one set of classes per scale. The classes
would have the minscale and maxscale properties.
I find the second case "cleaner" but I'm wondering about performance.
Would it be slower to draw the bottom classes ( the ones with minscale
properties only, for example) ?
Thanks,
--
Alexandre Dubé
Mapgears
www.mapgears.com
_______________________________________________
mapserver-users mailing list
mapserver-users@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/mapserver-users
