4DBloc

4DBloc is a GNSS‑based sensor designed for continuous, real‑time monitoring of ground surfaces and built assets. It delivers reliable positional data to track movements and structural behaviour over time.

Developed and validated in partnership with the French National Institute of Geographic and Forest Information (IGN), 4DBloc was created with the objective of providing a positioning solution that is robust, easy to deploy, cost‑efficient and capable of delivering a high level of measurement accuracy.

4DBloc, the accurate, robust and economical GNSS deformation sensor

Requiring no calibration or special maintenance, 4DBloc is a very simple sensor, and unlike other sensors in this family requires no regular maintenance.
It also consumes very little energy, and can be powered by a single solar panel installed at the same time.
It is the ideal instrument for the long-term monitoring of locations where access is challenging. 4DBloc data is processed by a dedicated, unique and fully automated algorithm to deliver a level of accuracy within a few millimetres, depending on circumstances and location.

4DBloc and its applications

4DBloc applications include:

Transport infrastructures: bridges, rails, roads, etc.
Hydraulic infrastructures: dams, coastal defences, harbours, etc.
Historic buildings and monuments
Mines

Principle of operation

Each 4DBloc sensor communicates with a gateway station using a radio transmission.

The gateway station transfers the data in real-time automatically via the internet.

The millimetric position is possible utilising two parameters:

Differential positioning: the position of each 4DBloc is calculated in reference to the 4Blocs within the network that are considered stable.
A powerful calculation algorithm developed with IGN

The 4DBloc solution gives you:

A robust system with a small footprint and low power consumption
The best GNSS-based deformation system on the market
Unrivalled value for money

The added benefits of using 4DBloc:

Cutting-edge expertise

developed from 20 years of experience and in-house development

The availability of dedicated local teams

as a result of our extensive network

A turnkey service

from installation to provision of pre-processed data in an accessible webspace

A culture of innovation

committed to the continual development of solutions more closely aligned with the practical challenges of our clients

A proactive maintenance programme

built around data quality control and monitoring

Download the 4DBloc solution datasheet

4DBloc solution datasheet EN

Download Document