RWIS Systems 00 En

7/28/2019 RWIS Systems 00 En

1/13

[Text eingeben]

Road Weather Information SystemsRWISDescription

SWARCO TRAFFIC SYSTEMS GMBH

RWIS_Systems_00_en


2/13


SWARCO TRAFFIC SYSTEMS GMBH Business Unit InterurbanNiederkircher Strae 16, D-54294 Trier, T. +49-651-81002-0, F. +49-651-81002-999, E. [email protected] 2/13

RWIS_Systems_00_en

Content

1 Functionality of RWIS Systems .................................................................................................... 32 The RWIS center ............................................................................................................................ 4

2.1 Tasks ....................................................................................................................................... 42.2 User stations / operating software ........................................................................................... 4

3 Central Software Architecture ...................................................................................................... 53.1 Data distribution ....................................................................................................................... 53.2 Data provision and archiving ................................................................................................... 53.3 Applications ............................................................................................................................. 5

4 Communication with the Meteorological Service ...................................................................... 64.1 Provision of data from the measurement stations ................................................................... 64.2 Receiving data from the meteorological service ...................................................................... 74.3 Data retrieval and processing .................................................................................................. 74.4 Plausibility check ..................................................................................................................... 74.5 Data evaluation road condition ................................................................................................ 84.6 Forecasts ................................................................................................................................. 8

4.6.1 Trend forecasts ................................................................................................................ 84.6.2 Consideration of the weather forecasts from the meteorological service ........................ 8

5 Warning model ............................................................................................................................... 95.1 General .................................................................................................................................... 9

5.1.1 Data base ...................................................................................................................... 105.1.2 Calculation intervals ...................................................................................................... 10

6 Alarming ....................................................................................................................................... 116.1 Generating alarms ................................................................................................................. 116.2 Notification per SMS and e-mail ............................................................................................ 12


3/13



RWIS_Systems_00_en

1 Functionality of RWIS Systems

Measurement stations collect a variety of measurement values such as road surfacetemperature, residual salt and precipitation.

In the local computer centre, the collected data is combined with general weather data of theNational Meteorological Service.

The resulting temporally and locally differentiated information on weather and road conditionsare evaluated and visualized in a graphical user interface.

They are basis for an optimized winter road service adapted to the current weather situation.

Image 1 Overview map of RWIS system in Hesse, Germany


4/13



RWIS_Systems_00_en

2 The RWIS center

2.1 Tasks

Communication per TLSoverIP or TC57 protocol

Retrieval of data of the stations connected with the GSM network, from the server.

Data reception per GSM-SMS

Central archiving of all RWIS data

Interface to the National Meteorological Service (forwarding of data from the

measurement stations, reception and forwarding of weather reports and warnings)

WAN-Com interface for the exchange of data from the measurement stations (as

standard only forwarding, optional extension for the reception of data)

Providing of data of the different measurement stations on a FTP server

Plausibility check, data processing for all measurement stations

Evaluation of forecast values, alarms and warning states for all measurement stations

Web-based user interface for the complete RWIS system

Alarm of the winter service personnel per SMS / e-mail

2.2 User stations / operating software Display of weather data in form of maps, tables and graphics

Access to historical data

Overview of error reports

Access to weather reports and weather warnings

Access to parameter settings (Data processing, forecast, ice warning model,

alarming, etc.)

Access to configuration settings (measurement station data, user administration, data

transmission and reception via external interfaces, etc.)

The user software is web-based, all measurement stations can be operated and visualizedvia RWIS center.


5/13



RWIS_Systems_00_en

3 Central Software Archi tecture

The system consists of the three parts datadistribution, data management and otherapplications.

The most important system-internal interface is the interface between the applications andthe data distribution.External interfaces are provided by applications working as protocol converter betweeninternal and external data formats.

3.1 Data distribut ion

The data distribution is the central system component for the communication between theapplications.

3.2 Data provision and archiving

The Data management archives all logged data and provides the data sets for systemconfiguration and parameterization.

The data management stores all data occurring during operation (data from externalsystems, results of data processing, weather reports etc.) and data necessary for theoperation of the system (especially configuration and parameterization). The data is stored ina central database.

All data are stored in the RWIS center or exported daily from the database. Data formats andname schemes of export files can be customer-specifically adapted.

3.3 Applications

The applications are used for all functional and technical requirements not covered by thedata distribution and management, such as data acquisition and processing, control model,external communication as well as operation and visualization.

Functions:

Configuration of the system at system start / retrieval of all data used for theconfiguration of the system from the central data management (configuration list ofexternal systems, configuration of operation and visualization, etc.)

Administration of the parameters which can be adjusted online (parameterization of

data acquisition and processing, ice warning algorithms, alarms, etc.

The operating software takes care of the retrieval and adaptation (edit) of all parametersettings as well as the configuration. Parameter changes are transferred into the next cyclewithout restart. For configuration changes, depending on their nature (e.g. change of theconfiguration of an outstation) a restart may be necessary.


6/13



RWIS_Systems_00_en

4 Communication with the Meteorological Service

Functions and tasks:

Provision of data from the measurement stations in the according format and cyclicalupload on the according server

Retrieval of current weather reports and warnings from the server Retrieval of the weather forecasts for a certain station from the server

4.1 Provision of data from the measurement stations

The according data are summed up in a 15 minute cycle (at XX:00, XX:15, XX:30, XX:45

oclock), converted into the according format and sent to the meteorological service.

The data is uploaded on the server of the meteorological service via internet per FTP.

Only those data are forwarded from the RWIS center to the meteorological service, which arerated plausible. Implausible or faulty data will not be forwarded, instead the according errorindication will be used.

The operation and visualization allows the configuration of the data sent to the meteo-rological service.

Here,

the selection of the data to be forwarded (measurement stations, amount of data permeasurement station),

the identification and geographical characteristics of the measurement station

can be adjusted by the authorized operating personnel.


7/13



RWIS_Systems_00_en

4.2 Receiving data from the meteorological service

The following data can be collected from the meteorological service:

10 day forecast, regional tables Weekly forecasts weather dangers General road weather forecasts Detailed regional road weather forecasts (in climate zones) Regional warning status reports Weather warnings concerning freezing, snow, snow drifts and black ice

The weather reports and warnings are evaluated and ordered according to their identificationin the message head:

Type of report (10-day / general / detailed / warning) Climate zone (detailed forecast) Location (weather warnings) Type of weather warning

The data is retrieved via internet per FTP transfer. The RWIS center cyclically checks theavailability of new weather reports and warnings and downloads them. Access informationand passwords can be set by the operator via user interface. The data from themeteorological service is stored in the RWIS center.

4.3 Data retrieval and processing

The RWIS center accepts environmental data, operating data and system reports as statusdata from the outstations.

Measurement stations, for which no time synchronization can be executed (GSM / GPRS-measurement stations generally), send their time stamp in UTC-format without respect todaylight saving time. For these measurement stations, the RWIS center adds the correctlocal time stamp (time zone, DST) based on the reported time stamp.

4.4 Plausibi lity check

The environmental data from the outstations are checked for plausibility. There is noreplacement of measurement values.

Plausibility checks:

Failure monitoring: A measurement value is considered as failure if it is indicated asfaulty or if it has not been transmitted within a parameterized time after themeasurement interval has expired (exception SMS data)

Threshold value monitoring: Checks weather the measurement value is within adefined parameterizable value range. The parameterization is possible for each

individual sensor. (A list of monitored threshold values is available on demand).


8/13



RWIS_Systems_00_en

Permanently identical measurement values (defective sensor / measurement station);the time range is individually configurable per measurement value.

Comparison of data from different sensors. (A list of data is available on demand)

All threshold values can be parameterized.

Incomplete data sets and/or implausible and faulty single data are identified and excludedfrom further processing (especially visualization, forecast, warning status evaluation). Validvalues of a complete data set and/or of a data set with partly implausible or faulty data will beprocessed.

4.5 Data evaluation road condit ion

The road condition status from the RWIS measurement stations are allocated to the roadcondition status according to the relevant (nationally required) coding1

.

Threshold values are parameterizable. The basic service is executed in coordination with thecustomer. The evaluation can be activated / disabled per measurement station.

4.6 Forecasts

4.6.1 Trend forecasts

Forecast values are provided as trend forecast (90 minute horizon, parameterizable) basedon current measurement values for the following measurement values:

Air temperature Relative humidity Dew point temperature Road temperature (surface, TT1, TT3)

The forecast is done by means of a linear extrapolating of the trend line taken from themeasurement values of the last 5 120 min (parameterizable). The parameter of thealgorithm can be changed online by the administrator individually for each measurementstation or for all measurement stations.

4.6.2 Consideration of the weather forecasts from the meteorological service

Measurement station related forecast values for air and road temperature from themeteorological service are considered in the evaluation of the forecast values by anaccording extension of the forecast algorithm via weighting of the trend forecast and forecastvalues by the meteorological service. The precipitation forecasts provided by themeteorological service per location are processed for the forecast horizon by means of aprecipitation probability.

The algorithms for processing / fusing the weather forecasts from the meteorological serviceare executed in cooperation with the customer. The parameters can be adjusted, the fusion

of forecast values can be disabled.

1For Germany, the coding is according to the German Technical delivery terms for roadway stations


9/13



RWIS_Systems_00_en

5 Warning model

5.1 General

An ice warning model is used to standardize the warnings based on the following datausually available:

Road surface temperature Road condition Air temperature Dew point temperature

Not only slipperiness due to precipitation, but also due to hoarfrost/rime with regard to roadtemperature and dew point temperature is consideredDefined warning messages and color codes with an accordingly allocated meaning are used:

green no danger of slipperiness white slipperiness possible when weather changes (e.g. beginning precipitation) yellow with continuing trend, slipperiness possible on short notice red slipperiness possible at once

Here, also combined warning messages are possible. The warning model can beactivated/deactivated and parameterized per measurement station on RWIS level.

In Germany, the warning model issued by the Federal Highway Research Institute is used:

Image 2 German warning model


10/13



RWIS_Systems_00_en

5.1.1 Data base

The following indicators are used as basic data:

Road surface temperature Road condition Air temperature Dew point temperature Forecast value road surface temperature Forecast value dew point temperature

Only those data sets are processed for which the analysis data mentioned above arecomplete and without errors. If the forecast values are incomplete, the algorithm is

processed. According terminating conditions within the algorithm are provided.

5.1.2 Calculation intervals

When new measurement values arrive (normally every minute) the warning model is appliedfor each measurement station. The new calculation is executed with a short delay after theupdated forecast values were calculated. Until then, the warning status of the measurementstation keeps its previous value.


11/13



RWIS_Systems_00_en

6 Alarming

6.1 Generating alarms

Measurement station related alarms and further alarms are generated and fed into the alarmmessage management as well as forwarded per SMS and e-mail.

Alarms depending on the warning status of the warning modelo Black ice (red)o black ice immediately possible (red)o rime immediately possible (red)o high risk of rime (yellow- red)o

slippery road immediately possible due to precipitation (white- red) User-defined alarms depending on measurement station values

o All measured variables of a measurement station includedo Comparison with threshold values (=, #, )o Combination of several conditions (AND, OR)

Alarms on arrival of weather reports / warningso Only certain types

Alarms for failureso Failure of a measurement stationo Failure of a communication processor remote bus

The alarm messages contain at least the following information:

RWIS station (or device) Time stamp Type of alarm message Message text

The generation of alarms can be switched on and off per measurement station. All thresholdvalues and minimum times of alarms can be parameterized. The field of responsibility for thealarm messages can also be parameterized per measurement station. Thus, certain alarm

messages can be allocated to certain user or user groups, which are to receive themessages via user interface.


12/13



RWIS_Systems_00_en

6.2 Notif ication per SMS and e-mail

In addition to the display on the user interface, the responsible personnel can be notified perSMS and/or e-mail in case of alarms. For each alarm message an individual configuration ispossible, whether it is forwarded and to whom.

The notification per SMS or e-mail complies with the following requirements:

Allocation of one or several recipients per alarm Setting of a minimum time during which the alarm is not send if it occurs again Administration of recipients:

o Name, according institutiono Telephone number or e-mail addresso

Availability depending on day groups and times

The SMS or e-mails contain the alarm message text, for SMS a short text (max. 160characters) is used.

In periods when the recipient is not available, no messages are sent. The transmission andfailures during transmission are logged.

The configuration of the notification (allocation of recipients, setting of minimum times,administration of recipients and contact data etc.) is done by an administrator via userinterface. Additionally, the notification can globally be activated / deactivated (e.g.summertime), without having to change the underlying configuration.

The notifications are sent via GSM-modem in the RWIS center. E-mails are sent viamailserver.

Documents

RWIS Systems 00 En