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Multi-band sampling strategy [message #72184]

Tue, 17 August 2010 20:10

JessW
Messages: 5
Registered: August 2010

Junior Member

Hi all,

I'm using an IDL script in ENVI to retrieve the values of a multiband
image at a user-specified number of pixels. The script works as
intended, but is quite slow; sampling an 8-band image at ~ 38,000
pixel locations takes
52.35 minutes. The issue is the following loop:

FOR i= 0L, nSamplePix - 1 DO BEGIN
pixValues[i,*] = ENVI_GET_SLICE(fid=fid,line=(index[1,i]-1),$
pos=bandsSelected,xs=(index[0,i]-1), xe=(index[0,i]-1))
ENDFOR

If anyone can suggest an alternate, faster sampling strategy--
preferably one that doesn't include the purchase of a new, faster
computer--I would be extremely grateful.

Thanks,

Jess

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[Message index]

		Multi-band sampling strategy By: JessW on Tue, 17 August 2010 20:10
		Re: Multi-band sampling strategy By: penteado on Wed, 25 August 2010 11:30

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