[mapguide-users] Tiling and other methods to improve performance

[Kori Maleski]

George,

Upgrade to 1.2, since the tiled maping/base layer performance is much
better.


Then use the tiling engine to pre-tile just the area of interest at large
scales.  Small scales you may tile the whole thing.

This will reduce the number of tiles significantly.


The tiling engine allows you to specify a bounding box in tile row/columns.
If you specify these bounds you can limit the tile generation to required
areas only.  This will have to be done for each zoom threshold - easily done
with a batch script.

I generated a tiled base map for the entire state of California in this
manner.  I tiled the entirety of all the small scale thresholds and then
just specific areas of interest (urban centres) at large scale thresholds.

To reduce tiles (and the amount of space they require) - try to reduce the
number of thresholds.  Some may be unnecessary.


Cheers,

________________________________




Kori Maleski
Senior Application Developer
WEBSOFT DEVELOPERS, INC.
P: (530) 759-8754 ext 114
F: (530) 759-0923
kori.maleski at websoftdev.com
________________________________

 

-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org
[mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of George McLean
Sent: Wednesday, September 19, 2007 3:32 PM
To: MapGuide Users Mail List
Subject: [mapguide-users] Tiling and other methods to improve performance

Hello,

I have a large base map that covers an area for an electric utility. The 
base map is in state plane grid coordinates and the map is about 100 
miles in both X and Y. Most of this map in this 100x100 region is blank 
since we only have base information near where the utility's facilities 
are located. I am trying to improve performance by using tiles. I would 
like to have zoom levels in pretty close, maybe on the order of 1:500 as 
well as zoom levels that much farther out. If I set this up with Base 
Layers in studio and then generate tiles using Websoft's tiling engine 
for each zoom level, I will get a huge number of tiles. If I do not 
generate tiles then performance is perceived as poor.

Are there any better strategies for dealing with large base maps that 
must be viewed both at the detail level and high zoom scales? I m still 
using MGOS 1.1 (maybe I should upgrade).

Thanks,

George McLean



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