clive.farquhar@[EMAIL PROTECTED]
wrote:
> I am trying to detemine the best band combinations in both Landsat TM
> and Terra ASTER. Currently I am using 3-band combinations, but I am
> looking to expand this to 4+ bands. I have not seen any literature on
> using more than 3 band with OIF. Does anyone know of any studies on
> this subject.
I assume by "OIF" you mean Optimum Index
Factor. Don't know of any studies, but why
would there be any? If you have 4+ bands
then you can't display them. What you can
do is stuff like Principle Components
Analysis or classification. Such techniques
can use *all* of the bands, and don't
particularly benefit from being given a
subset.
Anyway, Optimum Index Factor ranks the bands.
If you want 4+ then instead of selecting the
first three, select the first 4+.
> Also I am looking to see what all possible band combiantions are,
> using 3, 4, 5, 6, 7, and 8 band combinations in Terra ASTER imagery.
> Does anyone know a way to produce a list of all possible band
> combinations?
This is just basic statistics. Assuming
order is unim****tant (which is mostly
correct for visual display), there are
6!/(3!*(6-3)!) combinations of three bands
from six. See:
http://en.wikipedia.org/wiki/Combinations
To produce a list, spend 10 minutes with a
pen and paper.
--
Regards,
Martin Leese
E-mail: please@[EMAIL PROTECTED]
http://members.tripod.com/martin_leese/
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