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Re: Resample (neighborhood averaging) a 3D array with missing data [message #86767 is a reply to message #86766]

Mon, 02 December 2013 02:39

lecacheux.alain
Messages: 325
Registered: January 2008

Senior Member

Le lundi 2 décembre 2013 11:35:47 UTC+1, alx a écrit :
> Le lundi 2 décembre 2013 02:51:50 UTC+1, zhang...@gmail.com a écrit :
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>> Hello, everyone:
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>> I want to resample a 128x20000x32 (sample,line, band) image with missing data into a 32x5000x32 image, using neighborhood averaging over 4x4 pixels.
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>> The REBIN function cannot help, since it has no NaN keyword like MEAN; The "Average Arrays with Missing Data" tip in the "Examples To Illuminate the IDL Way" is for two arrays (http://www.idlcoyote.com/idl_way/smallexamples.html).
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>> The total amount of images is hundreds of gigabytes. Is there any fast solution to this?
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>> Thanks.
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>> Clark
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> resampled_array = mean(mean(reform(array,4,32,4,5000,32,/OVER),DIM=1,/NAN),DIM =2,/NAN)
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> alx.

Maybe faster would be:
resampled_array=mean(transpose(reform(array,4,32,4,5000,32,/ OVER),[0,2,1,3]), DIM=1,/NAN)

alx.

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[Message index]

		Resample (neighborhood averaging) a 3D array with missing data By: zhangj.sdu on Sun, 01 December 2013 17:51
		Re: Resample (neighborhood averaging) a 3D array with missing data By: Matthew Argall on Sun, 01 December 2013 20:55
		Re: Resample (neighborhood averaging) a 3D array with missing data By: zhangj.sdu on Mon, 02 December 2013 02:35
		Re: Resample (neighborhood averaging) a 3D array with missing data By: lecacheux.alain on Mon, 02 December 2013 02:35
		Re: Resample (neighborhood averaging) a 3D array with missing data By: lecacheux.alain on Mon, 02 December 2013 02:39
		Re: Resample (neighborhood averaging) a 3D array with missing data By: lecacheux.alain on Mon, 02 December 2013 02:44
		Re: Resample (neighborhood averaging) a 3D array with missing data By: Moritz Fischer on Mon, 02 December 2013 02:47
		Re: Resample (neighborhood averaging) a 3D array with missing data By: zhangj.sdu on Mon, 02 December 2013 16:28

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