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Net.Noise owner news at
Wed Jun 2 10:32:15 EDT 1993

Newsgroups: info.grass.user
From: shapiro at (Michael Shapiro)
Subject: Re: scaling imagery
Message-ID: <C800Dp.E5u at>
Sender: news at (Net.Noise owner)
Organization: US Army Corps of Engineers Construction Engineering Research Labs
References: <9305291454.AA04430 at wilson>
Date: Wed, 2 Jun 1993 14:32:13 GMT
Lines: 25

In <9305291454.AA04430 at wilson> kelly at (Kelly Elder) writes:

>In the past I have used ipw for image processing, and
>before using clustering and classifying routines I have
>scaled the input values from the imagery (i.e. mean=0,

>I would like to use the grass routines, i.cluster and
>i.maxlik for future imagery work and for classification
>schemes of nonimagery data. The obvious problem is the
>inability of grass to handle floating point numbers,
>which means scaling by conventional methods is impossible.
>Is there a statistically sound way around this problem?

>thank you, kelly

GRASS will handle 32 bit integers raster maps. It treats images
as raster maps. So scale them up to large integers (provided ipw
can do this).
Michael Shapiro               shapiro at
U.S. Army CERL                (217) 373-7277
P.O. Box 9005 
Champaign, Ill. 61826-9005

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