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Re: Band reader [message #37561 is a reply to message #37471]

Tue, 30 December 2003 05:13

julio
Messages: 31
Registered: December 2003

Member

Thanks Fotis, I'll try it!
Julio

Fotis <fotis@physics.uoc.gr> wrote in message news:<bsr9pk$njg$1@nic.grnet.gr>...
> Julio wrote:
>> Hello, I'm a new user of ENVI/IDL and I'm writing a routine to
>> calibrate the channels 1 and 2 of AVHRR images. Acording to KLM User's
>> Guide, the slope and intercept coeficients values depend on the CN.
>> I'm using the ENVI_GET_IMAGE to read the channels, but it reads the
>> matrix, and not unit values. How can I do to read only the CN and then
>> apply the right values of intercept and slope?
>> Thanks a lot!
> Assume that calibr. factors change for CN values larger or less
> than 499.
> Assume b1 is the matrix of the first band (0.63 micron)
> temp1=fltarr(ns,nl)
> temp2=fltarr(ns,nl)
> calibr_b1=fltarr(ns,nl)
>
> temp1=float(b1)* SLOPE1 + INTERC1
> temp2=float(b1)* SLOPE2 + INTERC2
>
> calibr_b1=temp1 * (b1 le 499) + temp2 * (b1 gt 499)

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[Message index]

		Band reader By: julio on Sun, 28 December 2003 19:22
		Re: Band reader By: julio on Tue, 30 December 2003 05:13
		Re: Band reader By: Fotis on Mon, 29 December 2003 23:34

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