[GRASS-dev] i.segment: Invalid region id -1
nik at nikosalexandris.net
Tue Dec 3 02:22:46 PST 2013
Nikos Alexandris wrote:
> >> I've tested this with at least three different similar cases. All work
> >> fine without the seed map! All fail with a seed map supplied. I guess,
> >> the only real difference is time for the processes to complete, right?
> > OK, I've just discovered that I mixed 8-bit (the Pan images) for the seed
> > map and 16-bit (the Multi-Spectral images). So, seed -> 8-bit, group to
> > be segmented -> 16-bit. Does this play a role?
> No, the seed map must be integer (not more than 32 bit int), that's
> the only limitation. The data to be segmented can be anything, integer
> and/or floating point.
Good to know.
> But it does not make sense to use a pan band as seeds when segmenting
> the other bands. Seeds are typically the result of a previous run of
> i.segment or the result of a previous classification of the same data.
Then I have inserted a small mistake in my tests/workflow. Wanted to drive
"finer objects" (from Pan) in bigger ones (based on MS). Will adjust.
Maybe we can add 1-2 sentences what a seed map is actually. What kind of
numbers per object for example.
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