| Re: what does hyperspectral mean? [message #2086] |
Tue, 17 May 1994 08:02  |
8015
Messages: 52
Registered: November 1993
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Member |
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In article <2railb$mmm@usenet.ins.cwru.edu>,
Mirko Vukovic <at913@cleveland.Freenet.Edu> wrote:
>
> The subject says it all. Answers, references, examples are welcome
>
It commonly refers to the number of bands in a data set. For instance,
the LandSat Thematic Mapper data is multi-spectral because it has
seven bands of data in the visual and infra-red bands of light
(electromagnetic spectrum for those really into technical terms).
"Multi" typically refers to a number from 4 to about 12 bands. "Hyper"
typically refers to a number of bands greater than that. There are
hyper-spectral scanners generating up to a couple hundred bands these
days. I don't know if they've gone commercial, though. Assuming the
spectral coverage of a multi- and hyper- scanner is the same, each
hyper- band is much narrower in spectrum coverage than a multi-spectral
band, so you end up with a data set which provides much more
discrimination, which is particularly applicable for material
classification. If there are "hard" numbers for where the terms multi
and hyper pertain to, I'm not aware of them.
Hopefully, that's an accurate answer, and if you stretch your
imagination, there is an example in there. Sorry, I don't have any
references.
Mike Schienle Hughes Santa Barbara Research Center
mgs@sbjse0.sbrc.hac.com 75 Coromar Drive, M/S B28/87
Voice: (805)562-7466 Fax: (805)562-7881 Goleta, CA 93117
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| Re: what does hyperspectral mean? [message #2093 is a reply to message #2086] |
Tue, 17 May 1994 08:54  |
ian
Messages: 26
Registered: February 1992
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Junior Member |
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Word has it that at913@cleveland.Freenet.Edu (Mirko Vukovic) may have said:
>
> The subject says it all. Answers, references, examples are welcome
Hyperspectral means having a lot of frequencies, like AVIRIS (224), while
multispectral means having more than one frequency, like Landsat (6?).
+-Ian Novack (Particle Man and Comatose Reader)-----+-ian@gomez.jpl.nasa.gov--+
| "...I was convinced that the public consisted | Jet Propulsion Lab |
| entirely of raging idiots." -- Dave Barry | Pasadena, CA |
+--Disclaimer: Had this been an actual opinion, it would still be mine.-------+
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