[Mapserver-users] Raster Image Limitation

[Rene Teniere]

Thanks Ed, I was hoping you would respond. We have a similar site
running ArcIMS and it is also slow, however, it does not crash when
trying to access the images (It uses MrSID's). What format are you
using, and what would you recommend?

Rene

Rene J.R. Teniere - BSc., D.GIS
GIS Technician
Nova Scotia Department of Natural Resources
Forestry Division (GIS) - Truro

Phone: (902) 893-5655
Mobile: (902) 209-8956

>>> "Ed McNierney" <ed at topozone.com> 2004-04-15 12:42:34 PM >>>
Rene -

If the problem crops up with the high-resolution data only (i.e. the
ECW
data) I would look to ECW first.  We certainly run several hundred
users
at a time on a database of several hundred thousand raster images and
have no problems like you report; we do not, however, use ECW.

	- Ed

Ed McNierney
President and Chief Mapmaker
TopoZone.com / Maps a la carte, Inc.
73 Princeton Street, Suite 305
North Chelmsford, MA  01863
ed at topozone.com 
(978) 251-4242  

-----Original Message-----
From: Rene Teniere [mailto:TENIERER at gov.ns.ca] 
Sent: Thursday, April 15, 2004 10:21 AM
To: gerry.creager at tamu.edu 
Cc: mapserver-users at lists.gis.umn.edu 
Subject: [Mapserver-users] Raster Image Limitation

Gerry,

I'll have to forward this off to the network admin in order to get
those
answers for you.

Rene

>>> Gerry Creager N5JXS <gerry.creager at tamu.edu> 2004-04-15 11:03:04
AM
>>>
What are the particulars on the server?  Also, are you backing up to a

database, or is this solely the rasters?  (Sorry, I'm looking at it
now,
but I've not had time to grok it all)... I'm thinking "Server" at this

point, as you're moving a lot of bits and thus have a lot of diskIO.

If you're talking 'bout a SCSI-based RAID5, you've got some of the
overhead covered.  If you're using a slow IDE disk, it's a lot worse.

Gerry

Rene Teniere wrote:
> Hi All,
> 
> We have a site that we want to go public (built using Chameleon
because
> my coded site is not ready yet and this had to be out ASAP) that
uses
a
> lot of rasters (410 indexed ecw's @ 18 - 25mb each). There are 4
other
> full images at much lower resolution that are scale dependent, once
you
> reach a certain scale the high res stuff kicks in. The problem is
that
> it works fine with one person, when multiple people use it, it craps

> out. We tested it out and it seems that it can only handle four high
res
> images at a time. Is this MapServer, ecw, or a server problem? Here
is
> the site:
> 
> http://nfis.gov.ns.ca/gmap/juan/index.phtml 
> 
> Thanks for your time,
> 
> Rene
> 
> _______________________________________________
> Mapserver-users mailing list
> Mapserver-users at lists.gis.umn.edu 
> http://lists.gis.umn.edu/mailman/listinfo/mapserver-users 

--
Gerry Creager -- gerry.creager at tamu.edu 
Network Engineering -- AATLT, Texas A&M University	
Cell: 979.229.5301 Office: 979.458.4020 FAX: 979.847.8578
Page: 979.228.0173
Office: 903A Eller Bldg, TAMU, College Station, TX 77843

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