Formed in 1990 by qualified Surveying Engineer Bertrand BOULLARD TopoSat® provides services focusing on the use of GPS/GNSS positioning techniques. It was one of the first in France to practice in this field when this technique was born in the 90s and remains one of the few to make it its main activity.
It works in the field for skate out or topographic survey work and also provides short training in conventional topography and GPS.It participated in the implementation of several CORS networks, in particular in Africa.She provides assistance and advice for writing SOW (topography works)
We operate throughout France and in the World.
Thanks to its lightweight structure, TopoSat® offers fast and flexible responses to all requests in its scope of expertise. We can also call on our informal partner network in France and various countries worldwide for support in case of large requirements in terms of personnel or equipment.
Environment & Golfs Courses
Topography and GIS
Civil Engeneering, mines and quarries
An overview of the services we have provided
Staking out of beacons, ILS and VOR
Staking out of beacons, ILS and VOR at many airports in mainland France as well as in French Guyana (Cayenne), New Caledonia (Noumea) and Martinique (Fort de France) for French companies specializing in airport infrastructure. For some works, we have been appointed too by the DGAC (National Airport Authority) and airports.
Airport Multilateration mode S
Skating out, GNSS survey and accuracy testing in international airports of Amsterdam, Bangkok, Brussels, Dehli, Geneva, Hong Kong, London (Heathrow, Gatwick), Paris (Roissy CDG and Orly), Vienna, Stockholm and Zurich for an American airport equipment company when implementing MLAT systems
NDVI Drone mapping
Aerial photos by drone with a multispectral sensor for the production of NDVI maps intended to establish recommendations on different crops.
Setting and georeferencement GNSS CORS in the frame of tractor guidance for Sugar company in Africa (Cameroon, Congo, Ivory Coast, Senegal) with French company Ventage Nord.
Training in the use of GNSS RTK for topographic surveys in these same farms.
Advisory and expertise mission for Comilog (Gabon)
Advisory and expertise mission for the implementation of a new geodetic reference network on the current and future site of the Comilog in Mouanda – near Franceville – and the operation of drone flights for the calculation of cubatures and themonitoring of construction sites (2019).
Consultant for Millennium Challenge Corporation
Consultant for US organisation Millennium Challenge Corporation for the establishment of a CORS network in Burkina Faso (2009-2014)
Consultant and trainer with national and European administrations
Consultant and trainer with national and European administrations for the implementation of measures of agricultural plots by GPS process or by conventional topography within the framework of controls related to the common agricultural policy (1993-2006).
Consulting in Malta
Advisory mission for the implementation of agricultural plot measures by GPS in Malta, within the framework of the integration of the Island into the European Community (2004).
Accuracy studies on surface measurements for the European Commission
Accuracy studies on surface measurements by GPS and aerial photogrammetry for the European Commission (DG Agri) during the implementation of the Common Agricultural Policy in the years 1993 to 1995.
Environment & Golfs Courses
Done mapping on Chantilly Golf course
Drone mapping of Chantilly Golf course to monitor the various technical developments (irrigation network) or course design (2018)
GPS / GNSS topography training courses
Chartered surveyors and surveying companies
Cadastre Services in France and Africa
National Geographic Institute in Africa and Haiti
Drone mapping of a pipeline in Namibia
Drone mapping of a pipeline in Namibia for a study of renewal of the pipeline on a linear of 45 km
Traverses survey for public works site
Several hundred of kilometers in France and Africa:
For the construction of TGV lines
For roads and irrigated areas in Africa
Member since 2002 of a CNIG (National Council for Geographic Information) working group on the monitoring of GNSS CORS networks in France.
Official rules for accuracy in topographic surveys
Tours Local Authority
City of Colombes (Paris Suburb)
It is the legal structure grouping the activities of Topography by Satellite (GPS / GNSS) and those of Drone mapping.
It is a brand name and the trade name of the Drone mapping activity.
The name of this brand is registered with the INPI and cannot therefore be legally used by another entity without the formal written agreement of its depositor.A copy of the trademark registration certificate can be downloaded by following this link.
Drone mapping service
In accordance with the regulations (arrêté du 17 Décembre 2015 et modifications récentes), we are registered with the DGAC as an operator of unmanned aircraft used in the context of specific activities under the number ED01760 for scenarios S1, S2 and S3.You can download the following documents:
This activity can only be carried out under the cover of a Particular Activity Manual.Its writing is complex and specific to each company.We only put one online an extractand have a printed version that we keep available to the competent authorities and to our customers during flights.
It is important to specify that the topography services by drone fall under two separate and complementary insurances covering the civil liability linked to the topographic service for one and that linked to the flight of the drone for the other.
If you put us in competition, don’t forget to check that the other providers consulted are properly insured on these two points.