In 2018, with the help of Val de Garonne Agglomeration, we created the bathymetric cartography of the Garonne between Meilhan sur Garonne and Clairac.
Two boats were equipped for this project, one recorded the data and one tested the navigational aid. The method we used was to compare the data of an IGN map with the aerial photographs, to update the sandbanks and to transmit the bathymetric data in situ.
A detailed databank (bridge, high voltage line, launching wedge,...) was integrated with their GPS co-ordinates for the project.
A first draft was published at the end of 2018 and the whole project was finished at the beginning of 2019. The map system by GPS will be installed on a boat in 2019 for testing and training pilots. We're studying several options to make this information available for everybody.