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Re: efficient comparing 1D and 3D arrays [message #60678 is a reply to message #60677]

Wed, 11 June 2008 10:29

Jelle
Messages: 19
Registered: May 2008

Junior Member

On Jun 11, 5:37 pm, Jean H <jghas...@DELTHIS.ucalgary.ANDTHIS.ca>
wrote:
> Hi,
> Yes you can...do something like:
> minVals = [15,30,12] ;Min val in each band
> maxVals = [75,80,60] ;Max val in each band
>
> allMin = rebin(minVals, nb,nl,ns) ;repeat the min band value for every
> pixels in each band
> allMax = rebin(maxVals, nb,nl,ns)
>
> goodPixels = where(imgData gt allMin and imgData lt allMax)
>
> ==> returns the indexes of imgData that satisfy the condition in EVERY band.
>
> Jean

:( unfortunately it does not return the indices I was hoping for. It
returns an array with between 0 and 75 elements, for each individual
element. So it tells me for which pixel which band matches. This I
*could* of course use to calculate the array_indices, subset by only
row/colum indices and reverse back into 1D positional elements, make
uniq() and then create the layer, but I am hoping there is a fell
swoop with which I can do this in one step; a way to create a [ns, nl]
bytearr with 0/1 to match the condition that each band for that bixel
falls within the desired range...

J

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[Message index]

		Re: efficient comparing 1D and 3D arrays By: Jelle on Wed, 11 June 2008 16:05
		Re: efficient comparing 1D and 3D arrays By: Chris[5] on Wed, 11 June 2008 14:24
		Re: efficient comparing 1D and 3D arrays By: Jelle on Wed, 11 June 2008 10:29
		Re: efficient comparing 1D and 3D arrays By: Jelle on Wed, 11 June 2008 09:48
		Re: efficient comparing 1D and 3D arrays By: Jean H. on Wed, 11 June 2008 09:37
		Re: efficient comparing 1D and 3D arrays By: Jelle on Wed, 11 June 2008 08:46
		Re: efficient comparing 1D and 3D arrays By: Craig Markwardt on Wed, 11 June 2008 08:09
		Re: efficient comparing 1D and 3D arrays By: Jean H. on Wed, 11 June 2008 13:46
		Re: efficient comparing 1D and 3D arrays By: Jean H. on Wed, 11 June 2008 16:21

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