HydroClass FAQ

Q: How does HydroClass treat typical failure cases related to dpolapp.conf, such as:

Configuration file missing?

A: switches off until restart of IRIS/RDA.
Syntax errors in dpolapp.conf parameter lines?

A: switches off until file is fixed.

Q: How to feed in the melting level (ML) value as an external input to HydroClass?

A: When operating:

RVP10 with IRIS/Radar setup_change -load tool, see SRI Product documentation
RVP10 without IRIS, contact Vaisala
IRIS/reingest, the ML stored in RAW is used

To use these momentary values of ML, HydroClass configuration dpolapp.conf must be set up with:

dpolapp.Quality.iAux[0] = 0

Alternatively, you can edit and update (either manually or with customized script tools)

dpolapp.Quality.iAux[0] = 1

and

dpolapp.Quality.iAux[1] = 3500

(where 3500 represents an example ML value, meters above mean sea level)

Q: How to monitor the ML value used/in use?

A: When operating in IRIS/Radar, use the utility command:

setup_change - list | grep ifalls.

When operating plain RVP10, use dspx > Mp

Q: When running HydroClass in distributed PC architectures such as RVPO900/AMR:

Where is the HydroClass configuration in use?

A: At PC running IRIS/Radar
Where to update the melting level with setup_change?

A: At IRIS/Radar

Q: How do HClass data look when HydroClass is tested using noise source input?

A: In commissioning phase and anytime, a viable method of testing functionality of HydroClass is to couple a coherent noise source to RVP10 IF inputs (for example, AMR built-in noise).

HydroClass can process such a data stream, by configuring RVP10 appropriately.

Observing HClass data stream with ascope, for example, see the data in the following figure.

Figure 1. Polarimetric measurements with HClass in an Ascope view when RVP10 is processing artificial noise inputs (correlated IF Signal in both receiver ports H and V)

HydroClass is in default configuration and uses the melting layer height value given in the configuration file (2300 m).