Nick and Daniel,
Thanks for the suggestions. I did manage to get it to run after playing
with some of the variables. If I used the default values for "sample"
and "min_size" it worked. Unfortunately the default values are less than
ideal. I think the main problem is with the "sample" parameter
Also, make sure you mask any Nulls since that often seems to be the problem
when i.cluster doesn't work as expected, especially if you are using landsat 7
slc-off imagery - although I've also experienced it with Landsat 4 and 5
imagery.
[Sent from a mobile device]
On Feb 18, 2011, at 4:38 PM,
Hi Ned and Daniel,
I have run into this problem in the past, and I believe it may have to do
with your convergence, min_size, and classes settings. Try decreasing some
of those and see if you don't get better results. You can also try
increasing your separation from 0.0 (the default) to 1.0 or 1
Hi Ned,
I have been using i.cluster in GRASS 7 on a 64-bit fedora server,
without any trouble. However, I managed to replicate your problem
and create a single class output by setting the parameter
'sample=5,5' as you had done in your example. If I run i.cluster without
that parameter, the signat
Hi - I would like to do an unsupervised classification using i.cluster
from GRASS 7 on my Ubuntu 64-bit machine. When I run i.cluster then
i.maxlik on a Landsat image I only get one output class, the entire
image. Only one class appears in the signature file so the problem is
with the i.cluster
