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Re: ENVI Question: Can you programmatically access the Available Spectra List? [message #53196 is a reply to message #53190]

Fri, 30 March 2007 00:07

Mort Canty
Messages: 134
Registered: March 2003

Senior Member

Jeff N. schrieb:

> Hi Mort,
>
> I already knew about your book :-) I was a TA for a remote sensing
> class in grad school last year and recommended to the prof. for that
> class that he use your book as his textbook. I still haven't gotten a
> copy for myself yet, but he has and he did say he liked it. So, in
> your book do you answer my question? I've looked everywhere for a way
> to get at this list but couldn't find it.
>
> Jeff
>

I confess (sheepishly) to never having worked with spectral libraries.
But they are just like ENVI images that you can access programmatically
with, e.g., ENVI_GET_DATA. For example the USGS Vegetation Spectral
Library is a single band image with 17 lines (the different spectra) and
420 samples (the data). So if you have a library in your available bands
list with file id FID and spatial subset DIMS, then

spectra = envi_get_data( fid=fid, dims=dims, pos=0 )

will put the whole thing into the IDL variable SPECTRA, and you can do
_anything_ you want with it.

Cheers

Mort

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[Message index]

		Re: ENVI Question: Can you programmatically access the Available Spectra List? By: Jeff N. on Fri, 30 March 2007 07:37
		Re: ENVI Question: Can you programmatically access the Available Spectra List? By: Mort Canty on Fri, 30 March 2007 00:07
		Re: ENVI Question: Can you programmatically access the Available Spectra List? By: Jeff N. on Thu, 29 March 2007 11:40
		Re: ENVI Question: Can you programmatically access the Available Spectra List? By: Mort Canty on Fri, 30 March 2007 13:34
		Re: ENVI Question: Can you programmatically access the Available Spectra List? By: Jean H. on Fri, 30 March 2007 09:21

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