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Re: Congrid/Rebin Conundrum [message #55927]

Thu, 13 September 2007 07:28

wlandsman
Messages: 743
Registered: June 2000

Senior Member

On Sep 13, 9:57 am, David Fanning <n...@dfanning.com> wrote:
> wlandsman writes:
>> So CONGRID is always just resampling your 4 x 4 array to a 1 x 1
>> array, so it just takes the value of data[0,0]. --Wayne
>
> OK, suppose I buy that. Then what is REBIN doing?
>

REBIN is averaging as your example shows. So I am making a
distinction between interpolation (finding a value at a point by using
values at neighboring points) and averaging. In general, CONGRID
is for interpolation (including nearest neighbor) whereas REBIN is for
averaging (though it does use interpolation for expansion).

I should mention frebin.pro (http://idlastro.gsfc.nasa.gov/ftp/pro/
image/frebin.pro ) which averages using partial pixels and thus,
unlike REBIN, can shrink or expand to any size. --Wayne

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		Re: Congrid/Rebin Conundrum By: wlandsman on Thu, 13 September 2007 07:28
		Re: Congrid/Rebin Conundrum By: David Fanning on Thu, 13 September 2007 06:57
		Re: Congrid/Rebin Conundrum By: wlandsman on Thu, 13 September 2007 06:48

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