Orphéon is a real-time RTK Full GNSS precision augmentation GPS correction system allowing users to position themselves with centimeter precision in the national reference anywhere in France and the West Indies with a single GNSS receiver:

Provide RTK GPS corrections

The Orphéon network is made up of nearly 220 observation stations, spread over the entire territory of metropolitan France and the West Indies. All of our stations form a large balanced RTK network that allows us to deliver centimeter RTK corrections to our many customers to increase the accuracy of their precision GPS. Our various services are marketed in the form of subscriptions or hourly packages.

Accuracy and availability

Thanks to its precision and the availability of its RTK GPS corrections, the Orpheon network offers increased productivity to all of its users in the fields of topography, construction, 3D digitization, machine control, precision agriculture and bathymetry, but also for new applications concerning autonomous vehicles, drones (UAV) and connected objects (IOT and M2M). Géodata Diffusion continues to develop the quality of its services through personalized support, responsive technical assistance and continuous improvement of its infrastructures. Our objective is to offer customers a secure and innovative service, guaranteeing them a high and constant utilization rate wherever they are, throughout the territory.

GPS Accuracy

The natural position provided by a GPS alone, gives a good idea of ​​where it is within a few meters, but is not precise enough to allow precision work. It requires correction so that its precision is increased and usable in agricultural work, topography, machine guidance or in many other fields of application (see).

Sustainable development

In addition, the Surveyors-Experts have introduced, in addition to a methodological approach to their work, a Sustainable Development approach for each of their services and can, here too, count on the assets of the Orphéon network to:

  • Perpetuate the land boundaries (georeference the works in the national geographic coordinate system in force in order to guarantee their consistency and the interoperability of the data)
  • Dematerialization of the documents produced (plans, plot reports, etc.) and delivery of the documents in the form of computer files.
  • Dematerialization of procedures: (Use of smart RFID terminals, boundary report, documents on digital media, etc.)
  • Sustain and update legal, land and administrative information
  • Conflict prevention in land operations
  • Optimize the movement of field vehicles
  • Manage construction waste
(Extract from the collection of services – Ordre des Géomètres-Experts)

knowledge of the earth :

Thus the monitoring of the movements of elements on the earth’s surface is an essential element for feeding analyzes of the evolution of the climate and the environment. Thanks to geodesy measurement techniques, it is possible to follow tectonic movements to the nearest centimetre. It is also possible to study the Earth’s atmosphere by analyzing the propagation of signals from positioning satellites in the different layers. Precision geopositioning also makes it possible to study the oceans and sea currents thanks to floating beacons equipped with GNSS receivers and operating 24 hours a day.

In the prevention of flood risks :

  • Catchment Study: Nominal Terrain Survey for Runoff and Flood Simulation
  • Georeferencing of measuring points (wells, meteors etc.)

In precision agriculture, reasoned production:

Monitoring the state of soils, crops, from seed to harvest, thanks to methodical monitoring and databases (GIS) then by crossing these data with the operating equipment itself connected and geolocated with precision, it is possible to reduce the quantity of pesticides or fertilizers spread, by determining and then administering precisely the quantities necessary in small areas. It is thus also possible to control the necessary watering more efficiently.

Territorial monitoring and population protection

In the prevention of landslide risks:

The monitoring of unstable areas consists of identifying cracks and shifts in the ground. tracking of ground movements using GPS measurements is carried out in the most active areas. These measurements made it possible to know that the earth moves in places by 80 cm per year on average, imperceptibly. Mountain slopes, for their geological diversity, their steep slopes and the multiple degradation factors (freeze-thaw, rainfall, earthquakes) that affect them, require often costly protection measures and risk management procedures. But also the very strong increase in traffic, both road and rail, has gradually highlighted the high vulnerability of transport infrastructures to natural risks and the costs, both human and financial, that they could represent.

The stability of a slope or cliff can be affected by the following external factors:

  • climatic phenomena: rain, snowmelt, cyclone, monsoon, freeze-thaw cycle, thermal gradient;
  • hydrological phenomena: modification of superficial and deep flows, coastal erosion, erosion of the foot of the slope by the bed of a watercourse, rapid decrease in the level of a river at the foot of the slope, flooding, impoundment of a blocade ;
  • phenomena that are sources of vibrations: earthquake, vibration linked to mining activity or the presence of infrastructure;
  • anthropogenic actions: earthworks at the foot of the slope, overloading at the crest, insufficient control of water discharges and surface runoff. The presence of water, through the development of pore pressures in the unstable mass of soils or rocks, is often considered to be the preponderant triggering factor.
Reasons for setting up a monitoring system:
  • Safety of installations and populations
  • Warning and risk prevention systems
  • Maintenance and renovation program
  • Development plans, reforestation, grassland
  • Watershed management

Monitoring of works of art

Monitoring the phenomenon of aging of engineering structures consists of identifying and then monitoring the signs that reflect this aging and monitoring the effectiveness of the measures implemented to control it. Depending on the nature, structure and classification of the structures concerned, various monitoring programs are put in place; either by regular inspection visits, or by the installation of permanent monitoring means.


All operations requiring centimeter precision are faster, more efficient, and more economical. From the preparatory study phases, to the construction or development operations and end-of-site control, everything is optimized. We offer you an overview of the different applications of the Orpheon network.

Orpheon subscriptions

The Premium Orpheon offer These subscriptions give access to unlimited Real-Time correction services in the NRTK Full GNSS centimetric repeatable GPS + Glonass + Galileo + BeiDou network.

Hourly Packages

The non-binding offer This is access to the N-RTK GNSS correction network with real-time centimeter accuracy (GPS, Glonass). Often used to discover our services.

Online post-processing and RINEX files from the Orpheon network

The 3D control offer This is access to the N-RTK Full GNSS correction network with centimeter precision (GPS, Glonass, Galileo, Beidou). Often used to control the accuracy of its measurements or even for areas where a mobile internet connection is not available for real time.


In your professional practice you can count on the knowledge, the know-how and the centimetric precision of the Orphéon network to meet your missions and your obligations. The network has been thought out and designed according to the rules of the art, it is constantly monitored and checked regularly. (The network-Orpheon). Everything has been thought out to allow you to benefit from increased productivity.
With the Orphéon network, you work with identical precision throughout the territory thanks to a uniform distribution of stations in metropolitan France and the West Indies. Whatever your position, the distance from the nearest reference station is never more than 30 km.

100% Galileo and BeiDou correction services in addition to GPS and GLONASS:

  • more satellites (+22 Galileo)
  • faster fixing,
  • more measurement stability,
  • more availability,
  • better positioning
  • fewer multipaths
Choose your area of ​​coverage and your duration of commitment according to your real need for an adapted price and discounts
RTK precision positioning geo-references your measurements or photogrammetry images in one step in real time to save production time. Or even as a control tool thanks to the post-processing available online.
A regular mesh and a reinforced infrastructure for you to secure data transfer, for greater reliability and repeatability on a daily basis.
The availability of the service gives the possibility to work from day to night, in foggy weather etc. by focusing their attention on the GPS guidance tool and no longer on driving for an always impeccable result