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

[GRASS GIS]

#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>
GRASS GIS <http://grass.osgeo.org>