The following code is ugly: ```py @property def data(self) -> dict[str, float, list[float]]: """Expose app's output data values in a dictionary.""" known_bad_keys = ("ram", "elev.default", "mapproj.utm.zone", "mapproj.utm.northhem") skip_keys = known_bad_keys + tuple(self._out_param_types) + tuple(self.parameters) data_dict = {} for key in filter(lambda k: k not in skip_keys, self.parameters_keys): value = self.__dict__.get(key) if not isinstance(value, otb.ApplicationProxy) and value not in (None, "", [], ()): data_dict[str(key)] = value return data_dict ``` Could be use `GetParameterRole()` to determine if the parameter is intended for output? ```py pyotb.Smoothing(...).app.GetParameterRole("ram") # 0 pyotb.Smoothing(...).app.GetParameterRole("in") # 0 pyotb.OrthoRectification(...).app.GetParameterRole("elev.default") # 0 pyotb.ReadImageInfo(...).app.GetParameterRole("spacingx") # 1 pyotb.ExtractROI(...).app.GetParameterRole("out") # 1 ``` Additionally, we should use `GetParameterTypes()` to avoid processing wrong params. ```py # Types returned from GetParameterTypes() types = { otbApplication.ParameterType_Int : "otbApplication.ParameterType_Int", otbApplication.ParameterType_Float : "otbApplication.ParameterType_Float", otbApplication.ParameterType_Double : "otbApplication.ParameterType_Double", otbApplication.ParameterType_String : "otbApplication.ParameterType_String", otbApplication.ParameterType_StringList : "otbApplication.ParameterType_StringList", otbApplication.ParameterType_InputFilename : "otbApplication.ParameterType_InputFilename", otbApplication.ParameterType_InputFilenameList : "otbApplication.ParameterType_InputFilenameList", otbApplication.ParameterType_OutputFilename : "otbApplication.ParameterType_OutputFilename", otbApplication.ParameterType_Directory : "otbApplication.ParameterType_Directory", otbApplication.ParameterType_Choice : "otbApplication.ParameterType_Choice", otbApplication.ParameterType_InputImage : "otbApplication.ParameterType_InputImage", otbApplication.ParameterType_InputImageList : "otbApplication.ParameterType_InputImageList", otbApplication.ParameterType_InputVectorData : "otbApplication.ParameterType_InputVectorData", otbApplication.ParameterType_InputVectorDataList : "otbApplication.ParameterType_InputVectorDataList", otbApplication.ParameterType_OutputImage : "otbApplication.ParameterType_OutputImage", otbApplication.ParameterType_OutputVectorData : "otbApplication.ParameterType_OutputVectorData", otbApplication.ParameterType_Radius : "otbApplication.ParameterType_Radius", otbApplication.ParameterType_Group : "otbApplication.ParameterType_Group", otbApplication.ParameterType_ListView : "otbApplication.ParameterType_ListView", otbApplication.ParameterType_RAM : "otbApplication.ParameterType_RAM", otbApplication.ParameterType_Bool : "otbApplication.ParameterType_Bool", otbApplication.ParameterType_Field : "otbApplication.ParameterType_Field", otbApplication.ParameterType_Band : "otbApplication.ParameterType_Band", } ```