[mapserver-users] Mathematical Scaling of Floating Point Data in Mapserver Map File

[Frank Warmerdam]

Peter Willis wrote:
> Frank Warmerdam wrote:
>> There isn't anything magical about 256.
>>
> 
> 256 or better raster scales sure are pretty though.... :)
> 
> Seriously though, the raster data is floating point log data
> with relatively random spatial distribution. Short of making
> two images, one log float and one anti-log float, it would be
> nice to be able to scale on the fly without duplicating the
> original data.
> 
> Duplication of rasters is O.K. if you have one or two, but
> once you near the 30k-40k files mark the disk space becomes
> a tad expensive.
> 
> Would it be out of line to suggest some scaling functions
> like the generic math functions:
> 
> log
> log10
> sin

...

Peter,

I understand your point, but I remain somewhat hesitant to build it
a lot more complexity into the floating point handling for display.

Best regards,
-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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