[mapserver-users] Re: [OSRS] very large image handling & serving?

[Paul Ramsey]

Performance and stability are always great themes to dwell on when
selling to PHBs. They sound both important and measurable. My anecdotal
experience with IMS and Mapserver has convinced me that Mapserver is
both faster, and more stable. However, I just have only a few personal
data points. Has anyone ever done a benchmarking which could be released
and used by other Mapservernauts to advance the cause?

"Lawrence E. Mallach" wrote:
> 
> Hi All
> 
> While this is not a free solution, it is a very good and very inexpensive
> solution. Try www.innomage.com.
> 
> ----- Original Message -----
> From: Matt.Wilkie <Matt.Wilkie at gov.yk.ca>
> To: <freegis-list at intevation.de>
> Cc: <osrs at remotesensing.org>; mapserver-users at lists. gis. umn. edu (E-mail)
> <mapserver-users at lists.gis.umn.edu>
> Sent: Thursday, August 23, 2001 5:18 PM
> Subject: [OSRS] very large image handling & serving?
> 
> > Hi All,
> >
> > What is the current state of open source / free software solutions
> > for handling and serving very large images?
> >
> > Please reply to me directly and I will summarize the responses back
> > to the lists in about a week.
> >
> > The goal is to serve up ortho-mosaics with the following dimensions
> > and size (uncompressed):
> >
> > RAW MOSAIC
> > 30 metre Standard: 37,000 x 32,000 pixels = ~ 1.2gig
> > 15 metre Panchromatic: 74,000 x 64,000 pixels = ~ 4.8gig
> > 60 metre Thermal:       18,500 x 16,000 pixels = ~ 296 meg
> >
> > IMAGE PRODUCTS
> > 30 metre RGB Composite      =  1.2gig x 3  =  3.6gig
> > 15 metre Enhanced Composite =  3.6gig x 4  = 14.4 gig
> >
> > The user would display a decimated reference image of the entire mosaic
> and
> > draw a selection box to select their area of interest.
> > This could be via a web or standalone app. Most areas of interest
> > would probably not be larger than screen size (eg. 1280x1064).
> >
> > Clients would require everything from full resolution 1to1 images
> > for remote sensing analysis to decimated "web-ready" screen shots.
> >
> > Other notes:
> >
> > - clients are desktop publishing apps (Word, Excel, Publisher,
> > Illustrator, PhotoShop), low end GIS (ArcView, MapInfo), high
> > end GIS/RS (ArcInfo v7&8, PCI), and web browsers (IE, NS).
> >
> > - Mutli-segmented intranet, Windows NT 4 domain servers
> >
> > - hardware of the server is yet determined but is not likely to
> > be that good, at least initially (eg. ~1ghz, 768mb ram, IDE RAID)
> >
> > - the sysadmins are all mostly Win32 based, the *nix expertise is
> > limited thus any *nix-based solution must be GUI and and should be
> > WIMP friendly.
> >
> > - there is a non-trivial amount of ESRI inertia, thus for
> > Mapserver to win out over ArcIMS there must be compelling
> > arguments with pretty pictures.
> >
> > - there is a non-trivial amount of Microsoft inertia, thus more
> > compelling arguments and more pretty pictures.
> >
> > I have no idea what the actual demand on the server will be, but
> > potentially a lot -- 595 computers spread over 21 subnets on the
> > intranet just answered to "net view".
> >
> > The results of this query are not likely to be implemented by
> > myself; I will be writing it up a report and passing on
> > recommendations.
> >
> >
> >
> > -matt
> >
> > -----------------------------------------------------------------
> > Matt Wilkie * Yukon Renewable Resources GIS
> > http://renres.gov.yk.ca/pubs/rrgis/
> > -----------------------------------------------------------------
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-- 
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     | Paul Ramsey
     | Refractions Research
     | Email: pramsey at refractions.net
     | Phone: (250) 885-0632
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