Opened 13 years ago
Closed 10 years ago
#1281 closed defect (fixed)
i.cluster not working with a high sample count
| Reported by: | nedhorning | Owned by: | |
|---|---|---|---|
| Priority: | normal | Milestone: | 7.0.0 |
| Component: | Imagery | Version: | svn-trunk |
| Keywords: | i.cluster, cluster sample | Cc: | |
| CPU: | x86-64 | Platform: | Linux |
Description
I am using i.cluster on GRASS 7.0 on a 64-bit Ubuntu computer.
If I use the default values for "sample" and "min_size" i.cluster works but if I set "sample=5,5" the resulting signature file only has one class. When I enter "sample=5,5" I assume that every fifth pixel from every fifth line is being sampled for use in calculating the cluster statistics. This is apparently too many samples for i.cluster to handle. If I use "sample=100,100" the program appears to work. I have a feeling that the sample array is not able to handle a large number of samples but have not verified this. It would be nice to be able to use "sample=1,1" even on large images.
Change History (2)
comment:1 by , 13 years ago
| Component: | Default → Imagery |
|---|---|
| Keywords: | i.cluster added |
| Version: | unspecified → svn-trunk |
comment:2 by , 10 years ago
| Resolution: | → fixed |
|---|---|
| Status: | new → closed |
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I have made a test with the example in i.cluster (using r61736) and did not run into this problem. Likely some internal data structures have been updated since your report.
I take liberty to close the ticket, feel free to reopen with an example (ideally based on the NC sample dataset).