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 1234I would really appreciate help on this.
Thanks a lot
Harini
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| Harini Nagendra E-MAIL : harini@ces.iisc.ernet.in |
| Center for Ecological PHONE : 91 80 309 2639 (Hostel: LR-94)|
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| Indian Institute of Science FAX : 91 80 334 1683 |
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any help is very welcome
Heiko Kehlenbrink