[GRASSLIST:5700] i.class class seperability
Heiko Kehlenbrink
heiko.kehlenbrink at vermes.fh-oldenburg.de
Fri Feb 28 18:03:14 EST 2003
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 |
>| Bangalore 560 012 India TELEX : 845 8349 IISc IN |
>------------------------------------------------------------------------
>
any help is very welcome
Heiko Kehlenbrink
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