Improving performance when using raster image tiles assembled with shape file

[Rahkonen Jukka]

Hi,

I am usually creating a quick look image of size 1000 by 1000 or 2000 by 2000 pixels first over my whole site first and make a separate layer from that. By playing with maxscale and minscale I show first the quick look and switch to tileindex when the resolution is not good enough any more. I set imageformat to GeoTIFF and save the resulting image on disk by asking the layer through wget so creating the quick look image does not take many minutes.

Gdaladdo overviews are good for fine tuning but they do not remove the need to go through every image your request concerns.

-Jukka-


-----Original Message-----
From: UMN MapServer Users List on behalf of antti siukola
Sent: Wed 5.7.2006 10:27
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: [UMN_MAPSERVER-USERS] Improving performance when using raster image tiles assembled with shape file
 
Hi!

What is the best way to improve performance when using large tif tiles
assembled with shape files. Now my response time is about 20 sec. per
page load when viewing the whole map since the whole size of the map
is about 3.3GB. Is pre-built overviews the solution (gdaladdo)?

AnttiS