[GRASS-dev] [GRASS GIS] #2057: Expand i.oif.py to work with any number of multi-spectral bands

#2057: Expand i.oif.py to work with any number of multi-spectral bands
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Reporter: nikosa | Owner: grass-dev@…
     Type: enhancement | Status: new
Priority: normal | Milestone: 7.0.0
Component: Imagery | Version: unspecified
Keywords: i.oif, i.oif.py, oif, permutations | Platform: Unspecified
      Cpu: Unspecified |
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I see no reason for i.oif.py 1) to work only with Landsat5 TM bands, 2) to
not accept a user-desired number of spectral bands as an input. See also:
[http://lists.osgeo.org/pipermail/grass-dev/2013-May/063975.html\].

Attached a quick change that makes i.oif.py read 8 spectral bands and
perform OIF calculations for 56 combinations (justified by the need to try
the script in an 8-band WorldView2 acquisition which features 8 spectral
bands).

It would be nice if the module would accept any number (4 or greater) of
spectral bands as an input and derive the OIF for all possible
combinations of the requested bands. I don't know if it really makes
sense for high-dimensional data, such as ones acquired by hyper-spectral
sensors -- no experience.

Changing the number of permutations (see def perms() in the script) is I
guess not that hard. At least, I think so. I have no idea about how to
count how many spectral bands are fed in to the module, so as to adjust
the number of permutations that the module should yield.

Are there any other similar scripts? Are there any "hard" restrictions
for a maximum number of bands to combined and derive OIF stats?

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Ticket URL: <http://trac.osgeo.org/grass/ticket/2057&gt;
GRASS GIS <http://grass.osgeo.org>

#2057: Expand i.oif.py to work with any number of multi-spectral bands
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  Reporter: nikosa | Owner: grass-dev@…
      Type: enhancement | Status: closed
  Priority: normal | Milestone: 7.0.0
Component: Imagery | Version: unspecified
Resolution: fixed | Keywords: i.oif, i.oif.py, oif, permutations
  Platform: Unspecified | Cpu: Unspecified
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Changes (by lucadelu):

  * status: new => closed
  * resolution: => fixed

Comment:

Hi,

I implemented the diff and improved it, now you are able to use at least 4
bands
and there is no maximum limitation.

I close the ticket, please reopen if needed.

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Ticket URL: <http://trac.osgeo.org/grass/ticket/2057#comment:1&gt;
GRASS GIS <http://grass.osgeo.org>