ENH: no-data value can be chose

app/otbClassificationMapMosaic.cxx

@@ -87,6 +87,10 @@ public:
         "is higher than the input pixel size, increasing this parameter will reduce aliasing artefacts.");
     SetDefaultParameterInt            ("interpolator.bco.radius", 2);
 
+    // No-data
+    AddParameter(ParameterType_Float, "nodata", "No-data value");
+    SetDefaultParameterFloat         ("nodata", 0.0);
+
     // Output
     AddParameter(ParameterType_OutputImage, "out", "output classification map");
     SetDefaultOutputPixelType("out", ImagePixelType_uint8);
@@ -132,6 +136,15 @@ public:
       {
         m_ArgmaxMosaicFilter->PushBackInput(inputArray->GetNthElement(i) );
       }
+
+      // Set nodata
+      FloatVectorImageType::PixelType nodatapix;
+      m_ArgmaxMosaicFilter->UpdateOutputInformation();
+      nodatapix.SetSize(filter->GetOutput()->GetNumberOfComponentsPerPixel());
+      nodatapix.Fill(GetParameterFloat("nodata"));
+      m_ArgmaxMosaicFilter->SetNoDataInputPixel(nodatapix);
+      m_ArgmaxMosaicFilter->SetNoDataOutputPixel(nodatapix);
+
       SelectInterpolator<ArgmaxFilterType>(m_ArgmaxMosaicFilter);
     }