ENH: Don't write RPC twice in image file

Modules/IO/IOGDAL/src/otbGDALImageIO.cxx

@@ -1940,27 +1940,18 @@ void GDALImageIO::KeywordlistToMetadata(ImageMetadataBase::Keywordlist kwl, int
     }
     else if (kv.first == MetaData::MDGeomNames.left.at(MDGeom::RPC))
     {
-      // RPC Models are exported directly from the ImageMetadata.
-      Projection::RPCParam rpcStruct = boost::any_cast<Projection::RPCParam>(m_Imd[MDGeom::RPC]);
-      this->SetAs("RPC/LINE_OFF",   rpcStruct.LineOffset);
-      this->SetAs("RPC/SAMP_OFF",   rpcStruct.SampleOffset);
-      this->SetAs("RPC/LAT_OFF",    rpcStruct.LatOffset);
-      this->SetAs("RPC/LONG_OFF",   rpcStruct.LonOffset);
-      this->SetAs("RPC/HEIGHT_OFF", rpcStruct.HeightOffset);
-
-      this->SetAs("RPC/LINE_SCALE",   rpcStruct.LineScale);
-      this->SetAs("RPC/SAMP_SCALE",   rpcStruct.SampleScale);
-      this->SetAs("RPC/LAT_SCALE",    rpcStruct.LatScale);
-      this->SetAs("RPC/LONG_SCALE",   rpcStruct.LonScale);
-      this->SetAs("RPC/HEIGHT_SCALE", rpcStruct.HeightScale);
-
-      this->SetAsVector("RPC/LINE_NUM_COEFF", std::vector<double> (rpcStruct.LineNum,   rpcStruct.LineNum   + 20 / sizeof(double)), ' ');
-      this->SetAsVector("RPC/LINE_DEN_COEFF", std::vector<double> (rpcStruct.LineDen,   rpcStruct.LineDen   + 20 / sizeof(double)), ' ');
-      this->SetAsVector("RPC/SAMP_NUM_COEFF", std::vector<double> (rpcStruct.SampleNum, rpcStruct.SampleNum + 20 / sizeof(double)), ' ');
-      this->SetAsVector("RPC/SAMP_DEN_COEFF", std::vector<double> (rpcStruct.SampleDen, rpcStruct.SampleDen + 20 / sizeof(double)), ' ');
-    }
-    // Note that GCPs have already been exported
-    SetMetadataValue(kv.first.c_str(), kv.second.c_str(), band);
+      // RPC Models have already been exported (see InternalWriteImageInformation)
+    }
+    else if (kv.first == MetaData::MDGeomNames.left.at(MDGeom::GCP))
+    {
+      // GCPs have already been exported (see InternalWriteImageInformation)
+    }
+    else if (kv.first == MetaData::MDGeomNames.left.at(MDGeom::ProjectionWKT))
+    {
+      // WKT projection have already been exported (see InternalWriteImageInformation)
+    }
+    else
+      SetMetadataValue(kv.first.c_str(), kv.second.c_str(), band);
   }
 }