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Message from discussion Mean preserving interpolation (conservative interpolation)
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wlandsman  
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 More options Oct 16 2012, 1:14 pm
Newsgroups: comp.lang.idl-pvwave
From: wlandsman <wlands...@gmail.com>
Date: Tue, 16 Oct 2012 10:14:24 -0700 (PDT)
Local: Tues, Oct 16 2012 1:14 pm
Subject: Re: Mean preserving interpolation (conservative interpolation)
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On Tuesday, October 16, 2012 12:52:39 PM UTC-4, Coyote wrote:

> The keyword you are looking for is MINUS_ONE:

While the /MINUS_ONE keyword works for your particular example, I don't believe it is a general solution.     I'd suggest frebin.pro ( http://idlastro.gsfc.nasa.gov/ftp/pro/image/frebin.pro ) as a flux-conserving alternative to CONGRID.

IDL> x = randomn(seed,100)*10
IDL> y = congrid(x,367,/minus_one,/interp)
IDL> z = frebin(x,367)                  
IDL> print,mean(x),mean(y),mean(z)
    -0.593289    -0.546786    -0.593280


 
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