Hi! I have a problem with modules i_ function classes. I get an error "Parameter subgroup (Name der Eingabe-Bild-Untergruppe) is missing". But I've created it and I put it in the appropriated field from the list.
Thanks! By!
On 10/29/2010 02:39 PM, nsofina wrote:
Hi! I have a problem with modules i_ function classes. I get an error "Parameter subgroup (Name der Eingabe-Bild-Untergruppe) is missing". But I've created it and I put it in the appropriated field from the list.
Can you try:
i.group -l group=<your group name> subgroup=<your subgroup name>
What do you get?
Thanks! By!
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Micha Silver
Arava Development Co. +972-52-3665918
http://www.surfaces.co.il
Hello Natalia:
(Returning to the list - perhaps someone else can help also)
The “too many subclasses” is not necessarily an error. I believe that it means one classification is too complicated, that is the spread of pixel values is such that it can’t create a signature for that class.
Did the process finish?
How did you make the training map? Are all the training areas with the same category uniform? If you setup a training area that is too large, with a broad mix of pixel values, then gensigset won’t be able to create unique signatures for each class.
HTH
Hi, Micha!
I can’t create a “sig-file” still… Below it is what I got after starting the i.gensigset:
(Fri Nov 05 12:47:14 2010)
i.gensigset trainingmap=my_cl@image_classification group=train@image_classification subgroup=train_sub signaturefile=train_sig
No need to explicitly enter the mapset here. It shoud be enough to do:
i.gensigset trainingmap=my_cl group=train
subgroup=train_sub signaturefile=train_sig
Finding training classes…
6 classes found
Reading raster maps…
Clustering class 1 (3324 pixels)…
Removed a singular subsignature number 5 (9 remain)
Removed a singular subsignature number 8 (8 remain)
Number of subclasses is 6
Clustering class 2 (1898 pixels)…
Removed a singular subsignature number 9 (9 remain)
Number of subclasses is 3
Clustering class 3 (2710 pixels)…
Number of subclasses is 10
Clustering class 4 (1347 pixels)…
Removed a singular subsignature number 10 (9 remain)
Removed a singular subsignature number 6 (8 remain)
Removed a singular subsignature number 2 (7 remain)
Number of subclasses is 6
Clustering class 5 (1024 pixels)…
Number of subclasses is 4
Clustering class 6 (2107 pixels)…
Number of subclasses is 1
So far this looks normal. You have a few thousand pixels in each training area which should be enough.
unable to create signature file train_sig for subgroup train_sub of group train@image_classification
Hmmm… What went wrong? One additional test below…
ERROR: Unable to create signature file <train_sig>
(Fri Nov 05 12:47:19 2010) Command finished (5 sec)
My training map I make so as it is described in your paper. I’ve tried to create it with different sizes of the training areas. And the color of the area I define using the function r.what.color.
I’m not sure what you mean here. Each training area should cover a uniform feature in the landscape. Perhaps send the output of:
r.info my_cl
r.univar my_cl
···
--
Micha Silver
Arava Development Co. +972-52-3665918
[http://www.surfaces.co.il](http://www.surfaces.co.il)