Using OTB algorithms in QGIS Model Designer


I would like to use the OTB algorithms in the Model Designer of QGIS.

I first used the “Segmentation” algorithm, but it seems not to be valid. I receive this error :

The “Segmentation” algorithm is invalid, because:

  • Value for is not acceptable for this parameter

Is there a way to make it usable in the Model Designer ?

I’m not sure if I’ll be able to use the output model from the “TrainVectorClassifier” afterward, on the Model Designer, but this is another issue.

Configuration setup
Version of the OTB: 8.0.1
I installed the OTB with: Can’t remember
QGIS version: 3.26.0-Buenos Aires

Thank you for your attenion,
Bye !

Dear @Jib,

Thank you for using OTB.

The output of “TrainVectorClassifier” application is a model file that you can use with the “VectorClassifier” application. I don’t think you will be able to use it with Model Designer of QGIS.

When using the “Segmentation” application, you can select the segmentation algorithm with the -filter [meanshift|cc|watershed|mprofiles] parameter. If you select the cc (Connected Components) algorithm, you are expected to provide the string parameter, to precise the connection condition for the algorithm, written as a mathematical expression. For example, you could set this parameter to intensity_p2 > 0.5.

Your error means that the mathematical expression provided is not built correctly.