High resolution rainfall in real-time


NOVIMET 11 boulevard d'Alembert
78280 Guyancourt

Phone: +33 (0)1 80 28 53 16
Fax : +33 (0)1 80 28 53 31

Email :



NOVIMET provides innovative information systems and technological solutions in hydro-meteorology for authorities and economic actors to help them to optimize their management of water resources and/or hydrological risks.

NOVIMET’s offer is modular and adaptable to the needs of meteorological agencies, municipalities, airports and agricultural cooperatives. NOVIMET provides a complete range of services from hardware (i.e. HYDRIX® radar) to the software for data interpretation (ZPHI®, RAINPOL®).

NOVIMET is composed of experts in radar meteorology with a strong scientific background. They have developed NOVIMET’s innovative solutions to be cost-effective and targeted for:

  • Urban hydrology: rain water management in normal and crisis situations.
  • Rural hydrology: fluvial hydraulics, flood forecasting or ground water management.
  • Agriculture: efficient and cost effective farm management.
  • Airports: improved air traffic management taking into account potentially dangerous meteorological events.

Products and services

HYDRIX® Radar :


The HYDRIX® weather radar proposed by NOVIMET is a specialized radar for the rainfall measurement. Associated to the ZPHI® software, it offers the same precision as 11000 rain gauges spread over a radius of 60 km.

HYDRIX® radar operates at X band and possesses the Doppler and polarimetric capability. At X band, an accurate antenna resolution is obtained with a moderate antenna size (1.5 m diameter). Thus wind resistance (to 180 km/h) of the positioner may be achieved without radome. Operating without radome has two main advantages:

1 – When raining over the radome, a water film develops, that induces a severe insertion loss and biases the radar calibration. Hydrophobic painting on the radome is not a practical solution since it loses its property after six months of outside exposure. Operating without radome allows avoiding this major inconvenient.

2 – The radome increases significantly the total mass of the system and increases infrastructure constraint and complexity of installation.

The HYDRIX® antenna of the offset type has been specified for particularly low side lobes (<-30 dB), which reduces the ground clutter and improves the radar visibility in complex terrain.

The mass of the aerial (about 350 Kg) is very light and fits on existing infrastructure like telecoms tower, water tank, silo, building roof.


 ZPHI® Software :


The ZPHI ® software implements three CNRS patents on which NOVIMET holds the exclusive license.

It takes advantage of  the “dual polarization” radar technology to extract the value of the intensity of rain with unprecedented precision.

ZPHI ® features are:

  • Measurement of the rain rate on the ground, with a precision better than a gauge.
  • Separation of precipitation echoes from clutters (ground clutter or sea).
  • Classification of different types of precipitations (rain, snow, sleet, hail).

The specific advantages of ZPHI ® lies in the fact that:

  • It corrects the estimation of the rain rate from the attenuation effects (for C-band and X-band).
  • It adapts itself to the natural variability of the rain, adjusting automatically the convertion “radar signal → rain intensity”, without degrading the spatial resolution of the input data…
  • It allows you to check the internal absolute calibration of the radar.
  • It has a module for classification of types of precipitations also suitable for attenuated band frequencies.

The ZPHI ® algorithm is applicable to  X-band (~ 9 GHz), C-band (~ 5 GHz) and S-band (~ 3 GHz).

RAINPOL® Web Platform:


RAINPOL® is a web-based interface. It allows :

  • to achieve specific treatment of hydrometeorological radar data.
  • to view the data on a basemap.
  • to be configured according to the needs of the client and the intended applications. It can be delivered with a rainfall-runoff model assimilating online measurements of precipitation and delivering in real-time flood forecasting. In addition, RAINPOL® platform is scalable. If the customer wants to implement new applications, especially commercial applications NOVIMET can implement them. Revenue from these commercial applications can participate in ROI of the overall system.

NOVIMET ensures the real time data distribution in a format compatible with your information system, for the following informations:

  • Rainfall during the last ten minutes.
  • Accumulated rainfall during the past hour.
  • Accumulated rainfall during the last 24 hours.
  • Accumulated rainfall from a specific date/time.
  • Classification of the nature of the precipitation (rain, snow, hail).
  • Animation of the rainfall (or snowfall) of the past two hours and anticipated rainfall fpr the next two hours.