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divide by zero problems [message #15362]

Tue, 11 May 1999 00:00

Mark Rehbein
Messages: 8
Registered: January 1999

Junior Member

Hi,

I'm having problems with floating point divide by zero's. The
application I'm using IDL for is image composition and masking.
Basically, my images have cloud pixels that I have changed to a zero
value. I also have a mask of the image that has values 1 for good pixel
and 0 for bad pixels (cloud). I then add all my images together to get
a "sum image" and add all my masks together to get a "sum mask".

Now to composite or average the images I do the following:

composite=sum image/ sum mask.

sometimes my images are very cloudy and as such my "sum mask" has zero's
in it and likewise for my "sum image". So I get divide by zero's and
NaN's in my resultant composite image. In fact I get whole image of
NaN's in my composite even though my sum image and sum mask have decent
values in them.

I'm using IDL 5.2 on UNIX box running solaris 2.6. Can anyone help?

please email me

mrehbein@aims.gov.au

Thanks in advance

Mark

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[Message index]

		divide by zero problems By: Mark Rehbein on Tue, 11 May 1999 00:00
		Re: divide by zero problems By: korpela on Sat, 15 May 1999 00:00
		Re: divide by zero problems By: bowman on Fri, 14 May 1999 00:00
		Re: divide by zero problems By: mallors on Fri, 14 May 1999 00:00
		Re: divide by zero problems By: Mark Hadfield on Fri, 14 May 1999 00:00
		Re: divide by zero problems By: davidf on Thu, 13 May 1999 00:00
		Re: divide by zero problems By: korpela on Thu, 13 May 1999 00:00
		Re: divide by zero problems By: Frank Monaldo on Tue, 18 May 1999 00:00

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