[GRASS-dev] What is the meaning of output from i.cluster

[Michael Barton]

i.cluster produces a text output file that looks like this (for the landsat 2000 images from the nc_spm_08 demo data set).

#produced by i.cluster
#Class 1
247
69.1174 50.3603 41.3482 18.9514 17.4534 117.049 14.2105 
10.5837 
12.6608 22.8737 
17.1663 29.6708 45.1628 
7.36345 9.28993 16.6389 47.4367 
9.14573 9.22619 16.9756 47.1115 70.631 
7.75037 6.67348 10.1294 13.043 14.9941 17.5505 
7.63372 6.74497 12.0565 27.4981 43.3025 12.0629 30.7522 
#Class 2
2059
70.0257 53.2035 46.205 61.085 61.5935 121.271 35.6688 
9.28262 
7.5725 9.99696 
11.3514 11.8868 22.0678 
-6.02017 -0.713125 -9.81723 54.7357 
-1.33501 2.43359 2.91134 15.8135 40.1529 
4.98865 4.49973 6.3419 -2.73927 -1.77851 11.3745 
5.31077 6.34246 10.6505 -4.60692 19.1398 3.18893 19.0243 

[more for the other classes]

So what does this mean? There is no clear explanation of this in the manual, and there are no variable names in the output.

I am guessing that 

line 1 is possibly the number of pixels in the class
line 2 is the cluster mean within each original raster input file (landsat maps bands in this case)

The remaining lines are some kind of matrix. If a correlation matrix, I don't understand why the diagonal is not 1--or at least the biggest number for the relevant input maps.

Any explanation? 


Michael
____________________
C. Michael Barton
Director, Center for Social Dynamics & Complexity 
Professor of Anthropology, School of Human Evolution & Social Change
Arizona State University

voice: 	480-965-6262 (SHESC), 480-727-9746 (CSDC)
fax:          480-965-7671 (SHESC),  480-727-0709 (CSDC)
www: http://www.public.asu.edu/~cmbarton, http://csdc.asu.edu











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