Role of `S coefficient` in Bayesian pansharpening

OTB Usage
1

Hi,
I am currently working with a few WorldView2 satellite images that I would to pan-sharpen from the 1.6m native resolution to 0.4m using OTB.

I have been able to do the whole process correctly but there is one thing I do not understand : what is the role of the S coefficient in the Bayesian Pansharpening ?

I could not find any explanation for this option, nor in the BundleToPerfectSensor and Pansharpening documentation, nor in the scientific literature. I tried to change it, using different values between 0.01 to 40.0, but I couldn’t see any different among the output images.

Could anyone add a description of the parameter ?

Thanks in advance,

Tom

2

Hi Tom,

This parameter is useless and has no effect. I am not the person who write this code thus I can not guess what the person was trying to do but the parameter has no effect in the code (it is always override here Modules/Core/PanSharpening/include/otbBayesianFusionFilter.hxx · develop · Main Repositories / otb · GitLab ).
I add an issue to remove this parameter from the documentation as it is useless. It will be remove in future versions.

3

Ok I see.

Thanks a lot for your answer !