[mapserver-users] MrSid

[Lowell Filak]

Correct, they are not multi-res however nothing says that you can't create multiple catalogs of multiple resolutions.
Dating back to an older post (Ed M.) to the group: if a 1' pixel takes 20MB a 2' pixel only takes 5MB & etc.
We did this for TIFF & WLD files using ImageMagick & Perl and produced 2', 4', 8', & 10' pixel versions of our original 1' photography and are very pleased with the result and speed of rendering. The only special thing that needed done during the map creation is to have a minscale & maxscale for the layers so the appropriate layer is displayed.
If you can use it and are willing to hack the Perl code that has been written particular to our site let me know and I'll send it to you.
Lowell F.

The following message was sent by John Hagstrand <johnhagstrand at interageresearch.com> on Sun, 07 Apr 2002 10:04:55 -0600.

> Thanks for your suggestion, Ben.  However, correct if I'm wrong, the 
> GeoTIFF format is not multi-res like MrSid.
> John
> 
> 
> At 07:48 PM 4/6/2002, you wrote:
> >On Sat, Apr 06, 2002 at 01:26:14PM -0600, John Hagstrand wrote:
> > > Hi,
> > > I have a MrSid file I want to display as a layer in MapServer.  Does 
> > anyone
> > > have an interface to do that?
> >
> >I'm new to Mapserver and don't know whether there is a Mapserver
> >interface or not--it would be very cool if there is.  In the mean
> >time...
> >
> >The MrSid Viewer is available for free download from the LizardTech
> >website (http://www.lizardtech.com).  The Windows version has the
> >ability to export the whole MrSID file or a portion of it as GeoTIFF
> >or, I think, TIFF with world files.  If you use Linux (as I do) I
> >suggest downloading the Windows version and running it under Wine.  At
> >least that worked well for me.  The Unix version of the MrSID viewer
> >doesn't have as many features and you can only save the currently
> >viewed region. :-(
> >
> >BTW, there seem to be several different flavors of the viewer for the
> >Windows platform.  The one you want is the Standalone Viewer and the
> >download is 6+ Mb.
> >
> >Hope this helps,
> >Ben
> >
> >--
> >Ben Logan: ben at wblogan dot net
> >OpenPGP Key KeyID: A1ADD1F0
> 
> 
> -------------------------------------------------
> John Hagstrand
> Interage Research, Inc.
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> Software Development Consulting for Internet Archive Retrieval
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