Slow Layer Display

[Ethan Alpert]

The .qix file will only help when zooming in to smaller areas. Are you
really able to see all 4344711 records in one display? I doubt it which
is why I suggested MINSCALE/MAXSCALE. 7-8 minutes could be fast or slow
depends on your hardward it's a *LOT* of records and is more features
than I ever show at once.

When I have such large sets I only display them at scales that make
sense.

-e

-----Original Message-----
From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On
Behalf Of Arun K Chanumalla
Sent: Monday, November 21, 2005 4:15 PM
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: Re: [UMN_MAPSERVER-USERS] Slow Layer Display


Hi Ethan,

Thanks for a quick turn around.
We are not displaying any shapefiles within a scale
limit and hence there is no scale information in the
map files.we are just trying to display the shapefiles
as they are.

how do i generate a spatial index (.qix) for the shape
file..?
is there a documentation avilable for that on the
mapserver web site.

Do you think 7-8 mins of time is reasonable for the
shape file 
with 4344711 records in the .dbf file.?

Thanks for trying to help me
Arun


--- Ethan Alpert <ealpert at DIGITALGLOBE.COM> wrote:

> Check out generating a spatial index (.qix) for your shapefile using
> shptree. This will speed up displaying when zoomed
> in to a subset.
> 
> Also check out MAXSCALE and MINSCALE to make sure
> you're only displaying
> the shapefile when it makes sense. With such a large
> number of records
> does it make sense to always display the layer?
> 
> -e
> 
> -----Original Message-----
> From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] 
> On Behalf Of Arun K Chanumalla
> Sent: Monday, November 21, 2005 3:31 PM
> To: MAPSERVER-USERS at LISTS.UMN.EDU
> Subject: [UMN_MAPSERVER-USERS] Slow Layer Display
> 
> 
> Hello Everyone,
> iam a newbie to mapserver and this is my
> first post.i have an elevation data shape file which
> has as many as
> 4344711 records in the .dbf file.This shape file is
> taking  7--8 mins to
> get completely displayed on the browser.
> 
> iam assuming that delay in display time is due to
> the large numebr of
> records in the .dbf file.
> 
> is there a way to speed up the process of displaying
> the shapefile. iam
> using PHP and html.
> 
> All your suggestions are welcome
> 
> Regards
> Arun
> 



		
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