MARWIS-UMB – Mobile Road Weather Data Collection System

MARWIS is the first mobile road and runway weather sensor that has been developed specifically for the detection of road conditions, friction, temperatures, and other parameters in real-time from driving vehicles.

The mobile road weather sensor referred to as MARWIS turns vehicles into driving weather stations by detecting numerous runway weather and crucial road parameters. It can also be installed on vehicles with a distance of around 1 to 2 m above the surface.

Furthermore, it gives information regarding dew points, water film heights, temperatures, road conditions (wet, dry, ice snow, and moist), ice percentages, friction, and relative humidity ranging up to a frequency of 100 times per second.

MARWIS acts as significant decision support concerning preventive gritting. As a result of the open interface protocols, it can be combined easily into current winter maintenance monitoring networks. Likewise, the mobile road sensor has the potential to communicate directly with the help of a control system on gritting vehicles. The measurement data output supports the protocol UMB binary.

Table 1. Source: OTT HydroMet

. .
Parameters measured: Layer thickness of water, snow and ice, surface conditions (dry, damp, wet, snow, ice), friction, optional: road surface temperature
Measurement technology: Weighing principle
Product Highlights: Mobile, plug and play, 100 measurements per second with max. output rate of 10Hz, multifunctional, real time thermal mapping, wireless data transfer
Interface: Bluetooth, RS485, CAN-Bus


MARWIS-UMB-Mobile Road Weather Data Collection System

Image Credit: OTT HydroMet

MARWIS-UMB-Mobile Road Weather Data Collection System

Image Credit: OTT HydroMet


  • Easy data transfer via Bluetooth, RS485 or CAN-Bus
  • Dynamic mobile data in real time and 100 times per second and a max. output rate of 10Hz.
  • Multifunctionality
  • Measurements both on the ground and in the ambient air
  • Easy to install and to clean
  • Free MARWIS app for calibration, data view as well as transfer available on Google Play and iTunes
  • One or two meter version for different vehicle types

Examples of Use

  • Decision support for winter maintenance operators on roads, motorways, highways (municipalities, federal states and provinces)
  • Decision support for the de-icing of runways (higher efficiency)
  • As important part of the IDS (Ice Detection System) in form of a RCC (Runway Condition Code), water film height (aqua-planning risk) and friction detector on airports (digital alternative to mechanic grip testers)
  • For smart city applications
  • For weather data collection and weather forecast model improvements

Technical Data

Table 2. Source: OTT HydroMet

Dimensions Height approx. 110 mm, width approx. 200 mm, depth approx. 100 mm
Weight 1.7 kg
Admissible storage temperature -40...70 °C
Operating rel. humidity <95 % relative humidity non-condensing
Operating voltage 10...28 VDC on the sensor
Power consumption Approx. 3VA without heating, 50VA with heating
Operating temperature -40...60 °C
Operating rel. humidity 0...100 % RH
Protection type IP68
Surface conditions Dry, damp, wet, snow-/ice-covered, chemically wet, critically wet
Admissible height above absolute altitude 3000 m
Interface RS485, 2 wire, half duplex, bluetooth, CAN
Road surface temperature
Principle Optical
Measuring range -40...70 °C
Unit °C
Accuracy ± 0.8 °C @ 0 °C
Resolution 0.1 °C
Ambient temperature
Measuring range -50...70 °C (°F switchable)
Unit °C (°F switchable)
Resolution 0.1 °C
Relative air humidity
Measuring range 0...100 %
Unit %
Principle passive, calculated out of air temperature and humidity
Relative humidity above road surface
Measuring range 0 ... 100 %
Unit %
Resolution 0.1 %
Principle passive, calculated out of air temperature and humidity above road surface
Dew point temperature
Measuring range -50 ... 60 °C
Unit °C
Resolution 0.1 °C
Principle passive, calculated out of air temperature and humidity
Accuracy 1.5 °C @ temperature of 0...35 °C
Waterfilm film height
Principle Optical
Measuring range 0 ... 6000 µm
Unit µm
Resolution 1 µm
Accuracy 10%
Ice Percentage
Measuring range 0 ... 100 %
Unit %
Resolution 1%
Measuring range 0...1
Resolution 0.01

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