Raster - TIF vs JPG

[Roland Martin]

"Tiled TIFF files with overviews pre-built are one of the highest
performance ways of serving large raster images."
From:
http://mapserver.gis.umn.edu/docs/howto/raster_data/?searchterm=raster%20tiff

Not sure what it means by 'overviews', though!

Presumably JPG images require decompression prior to creating the output
image, whereas TIFFs can just be read straight off.

Cheers,
Roland.



On 21/08/06, Léveillé, James <James.Leveille at mtq.gouv.qc.ca> wrote:
>
>  Hi,
>
> I have about 4 000 georeferenced images.
> I can use either TIF (with overviews) or JPG format.
> Which one should I use with MapServer ?
> Which one offers the most performance ?
>
> Regards
>
> __________________________________________
> *James Léveillé*
>
> *Intélec Géomatique*
> 420, boul. Charest Est
> Bureau 400
> Québec (QC), Canada
> G1K 8M4
>
> Intélec Géomatique: 418.687.5000
> MTQ: 418.380.2005 (#227)
>
>



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