Hi all,
I'm trying to create a signature file using i.gensig.
I aquiered the training sites with v.digit and
converted them to raster. My raster file consist of 5
small "clumps" with value 1 and the rest is null. When
I run i.gensig I gue the message
Signature 1 not positive definite
and the signature file only contains # on the first
line
What could be wrong?
Thanks
Daniel
__________________________________
Do you Yahoo!?
SBC Yahoo! DSL - Now only $29.95 per month!
http://sbc.yahoo.com
On Tue, Jul 01, 2003 at 10:51:28AM -0700, Daniel Victoria wrote:
Hi all,
I'm trying to create a signature file using i.gensig.
I aquiered the training sites with v.digit and
converted them to raster. My raster file consist of 5
small "clumps" with value 1 and the rest is null. When
I run i.gensig I gue the message
Signature 1 not positive definite
and the signature file only contains # on the first
line
What could be wrong?
Probably the traiing areas are to small or do not cover
the image channels?
You may try to use
i.gensigset
i.smap
instead which performs usually better than i.maxlik.
Markus