The principle of the RGF93 :
The RGF93 provides practical access to a geodetic system.
It can be :
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- Light on the RGF93 (French Geodetic Network 1993)
- Light on the RGF93 (French Geodetic Network 1993)
- Light on the RGF93 (French Geodetic Network 1993)
- Light on the RGF93 (French Geodetic Network 1993)
- Light on the RGF93 (French Geodetic Network 1993)
- Light on the RGF93 (French Geodetic Network 1993)
- Light on the RGF93 (French Geodetic Network 1993)
- Light on the RGF93 (French Geodetic Network 1993)
- Light on the RGF93 (French Geodetic Network 1993)
- Light on the RGF93 (French Geodetic Network 1993)
Light on the RGF93 (French Geodetic Network 1993)
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What is RGF93?
In Metropolitan France, the official geodetic system is the RGF93, which provides a precise reference mark for the whole country while adapting to modern technologies…
… Compatible with world references, the RGF93 is a component of the European ETRS89 system.
As part of the maintenance of national geodetic references, TERIA partner IGN has recalculated all the Permanent GNSS Network data for the period 1998-2019.
With an impact of less than a centimetre, these updates have been migrated without any interruption of service to ensure accurate and consistent results for your measurements.
A little history
RGF93 is the successor to the old French geodetic system, the Nouvelle Triangulation de la France or NTF. From the end of the 19th century onwards, this old process enabled landmarks to be materialised using angular measurements (more information on the IGN website)
When the GNSS system was deployed in 1989, it was clear that the NTF no longer met the needs of surveyors or topographic surveys. So the RGF93 was born.
- ” Materialised ” through a set of physically defined points (monuments, landmarks) whose coordinates are known in the RGF
- “Active“, represented by all the permanent GNSS stations in the RGP (more information)
Characteristics of the RGF93 :
- Three-dimensional geocentric
- Linked to the global reference system ITRS (International Terrestrial Reference System)
- Associated with the IAG GRS 1980 ellipsoid
- With the international meridian ( Greenwich meridian) as its prime meridian
- Associated with the Lambert-93 projection and the CC 9 Zones projections
- Horizontal accuracy of between 1 and 2 cm (relative to global systems)
- Vertical accuracy between 2 and 5 cm (relative to world systems)
- Suitable for modern positioning techniques
RGF (French Geodetic Network)
Composed of 3 parts:
- RRF : French Reference Network with 23 points determined by space geodesy
- RBF : French Base Network made up of 1009 sites determined by space geodesy
- RDF : French Detail Network made up of NTF sites whose coordinates have been recalculated in RGF93
RGP (PERMANENT GPS NETWORK)
The Network is constantly expanding: 517 stations to date
You can find the list of stations on the official IGN website: http: //rgp.ign.fr/STATIONS/liste.php
Maintaining the reference benchmark in France
Maintaining the reference benchmark in France
The average changes in coordinates observed are as follows:
EST: -2.6 mm
NORD : -2.8 mm
HAUTEUR : -8 mm
These very minimal updates, with an impact of less than a centimetre, have been migrated without any interruption to service, so you can be sure of consistent measurement results for your surveys and layouts.
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