Date (Revision)

2025-10-21

Citation identifier

RMI-be / synop

Status

On going

Point of contact

Organisation name	Individual name	Electronic mail address	Role
Royal Meteorological Institute of Belgium		info@meteo.be	Point of contact
Royal Meteorological Institute of Belgium		info@meteo.be	Owner

Maintenance and update frequency

Continual

User defined maintenance frequency

P0Y0M0DT1H0M0S

GEMET - INSPIRE themes, version 1.0

• Meteorological geographical features

Keywords

• Reporting INSPIRE

• federal government

• observation

• synoptic

• cloudiness

• visibility

• wind speed

• wind direction

• gusts

• temperature

• dew point

• humidity

• pressure

• weather type

• precipitation

• snow

• sun duration

Spatial scope

• National

Access constraints

Other restrictions

Other constraints

No limitations on public access

Use constraints

Other restrictions

Other constraints

Creative Commons Attribution 4.0 International (CC BY 4.0) This is a human-readable summary of (and not a substitute for) the license. You are free to: Share — copy and redistribute the material in any medium or format Adapt — remix, transform, and build upon the material for any purpose, even commercially. Under the following terms: Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.

Classification

Unclassified

Spatial representation type

Vector

Language

English

Topic category

• Climatology, meteorology, atmosphere

Begin date

1952-01-01T00:00:00

Unique resource identifier

EPSG:4258

Distribution format

Name	Version
CSV	1.0
GML	2
GML	3.1
GML	3.2
GeoJSON	1.0
KML	1.0
Shapefile	1.0

OnLine resource

Protocol	Linkage	Name
WWW:LINK-1.0-http--link	https://opendata.meteo.be

OnLine resource

Protocol	Linkage	Name
OGC:WMS-1.3.0-http-get-capabilities	https://opendata.meteo.be/service/synop/wms?service=WMS&version=1.3.0&request=getCapabilities	synop:synop

OnLine resource

Protocol	Linkage	Name
OGC:WFS-1.0.0-http-get-capabilities	https://opendata.meteo.be/service/synop/wfs?service=WFS&version=1.1.0&request=GetCapabilities	synop:synop

OnLine resource

Protocol	Linkage	Name
WWW:DOWNLOAD-1.0-ftp--download	ftp://opendata24-me.oma.be/observations/synop

OnLine resource

Protocol	Linkage	Name
WWW:LINK-1.0-http--link	https://opendata.meteo.be/ftp/observations/synop

OnLine resource

Protocol	Linkage	Name
WWW:LINK-1.0-http--link	https://opendata.meteo.be/documentation/?dataset=synop	Documentation

Hierarchy level

Dataset

Other

dataset

Statement

SYNOP data are first subjected to an automatic quality control where we check for missing values and if the values are within certain physical limits. This automatic QC is followed by a manual QC performed by RMI staff members.

Different instruments are calibrated by RMI in its calibration laboratory.

The TEMPERATURE sensors are calibrated by comparing the pt100 sensor of the station with the pt25 reference sensor of the calibration lab (which are calibrated by the national metrology lab). They are compared in a thermostatic bath which contains an “azeotropic mixture of propyleenglycol and water” (50-50%). This allows the same bath and mixture to be used for the entire temperature range (-25°C to 35°C). The calibration is performed at 6 fixed temperatures: -25°C, -10°C, 0°C, 10°C, 20°C and 35°C.

The calibration of the PRESSURE sensors is performed using a balance system with two pumps (for under and over pressure) and three reference sensors: a recent one (rpm4) and two older ones (paroscientific) in an automated way with 3 up and down cycles within the pressure range 810-1050hPa, with a calibration every 30hPa.

The calibration of the HUMIDITY sensors is performed in a climate closet (Weiss) by varying the temperature and relative humidity and by using a chilled mirror sensor.

Metadata

File identifier

RMI_DATASET_SYNOP XML

Metadata language

English

Hierarchy level

Dataset

Date stamp

2025-10-21

Metadata author

Organisation name	Individual name	Electronic mail address	Role
Royal Meteorological Institute of Belgium		info@meteo.be	Point of contact

Other language

Language	Character encoding
French	UTF8
Dutch; Flemish	UTF8
German	UTF8