[GRASSLIST:6366] i.maxlike does not read sig file

GRASS GRASS user
1

Hello,

I tried an unsupervised classification with i.group, i.cluster and i.maxlik.
However i.maxlik prompts that it can't read the signature file.

I read the Image Processing tutorial and the help files but cannot find what I
did wrong.

procedure:

i.group group=all_img subgroup=all_img_sub
input=mask_evi_250m16d_recode.1,mask_evi_250m16d_recode.2, .....

i.cluster group=all_img subgroup=all_img_sub sigfile=all_img_sig classes=100

i.maxlik group=all_img subgroup=all_img_sub sigfile=all_img_sig
class=all_img_class reject=all_img_rej

i.maxlik prompts:
Can't read signature file all_img_sig

Any idea where I went wrong?

thanks in advance, cheers Martin

P.S.: GRASS 6 debian rep.

2

Hallo Jachym,

On Friday 08 April 2005 13:00, you wrote:

ls $GISDBASE/$LOCAION_NAME/$MAPSET/group/all_img/subgroup/all_img_sub/

ist all_img_sig irgendwo in irgendeinem unterverzeichniss?

yes, the sig file is there.

I tried the same with the spearfish data set and did the same with i.group
i.cluster and then i.maxlik -- it worked, I received an output map.
Hence my data set must cause i.maxlik not to find the sig file, doesn't it?

Martin

P.S.:These warnings appeared as well:

i.maxlik group=test subgroup=test_sub sigfile=test_sig class=test_class
WARNING: signature 64 is not valid (ill-conditioned) - ignored
WARNING: signature 73 is not valid (ill-conditioned) - ignored
i.maxlik ...