[GRASSLIST:5700] i.class class seperability

[Heiko Kehlenbrink]

Hi all,

i'm just working on some classifications using Landsat Images and i.class.
I'm wondering if there is a way to get informations about the 
seperablility of the classes.
Maybe the signature files could be used ?
Did anybody know something specific about the coloumns in the signature 
files?
There was a posting a long time ago regarding this...

>Hello all,
>I have classified a set of 20 landscapes using Grass4.1 for linux, using 
>i.class followed by i.maxlike. After getting the classified landscapes, I 
>have been trying to see how the landscapes look in terms of various 
>landscape parameters.. patch sizes, shapes, landscape connectivity, etc. 
>I want to now check how dependent the results of this landscape analysis 
>are on the input training sets I have provided for i.class. What I 
>thought is, I can play around with the signature files generated by 
>i.class, change the means/std.deviations/covariances slightly, reclassify 
>the landscapes with these, and then check how my landscape parameters 
>look - this will give me an idea of how robust these parameters of 
>landsacpe structure are. 
>So - for this I need to know what each of the numbers in the signature 
>files mean.. I have figured out part of it but need help on the rest. 
>Also, any suggestions on the usefulness or otherwise of what I am 
>planning to do would be appreciated.
>I am enclosing a signature file below.. my imagery has 4 bands
>
>#
>#eucalyptus
>16 - this is the number of pixels which I have marked
>42.812500 23.875000 25.687500 61.187500 - mean intensities in Bands 1,2,3,4
>0.429167                        | these 3 lines must be the covariances 
>-0.091667 0.383333              | between bands - I need to know which 
>0.270833 0.158333 0.629167      | one is for which pair of bands
>-0.095833 -0.308333 -0.204167 0.829167 - this is the std.devns for bands 1234
> 
>
>I would really appreciate help on this.
>Thanks a lot
>Harini
>------------------------------------------------------------------------
>| Harini Nagendra               E-MAIL : harini at ces.iisc.ernet.in      |
>| Center for Ecological         PHONE  : 91 80 309 2639 (Hostel: LR-94)|
>| Sciences                             : 91 80 309 2506 (Department)   |
>| Indian Institute of Science   FAX    : 91 80 334 1683                |
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>


any help is very welcome

Heiko Kehlenbrink