Photogrammétrie: Découvrez la solution Raphal
Photogrammétrie: Découvrez la solution Raphal
Photogrammétrie: Découvrez la solution Raphal
Photogrammétrie: Découvrez la solution Raphal
Photogrammétrie: Découvrez la solution Raphal
- TERIA and its commitment to scientific research in environmental protection
- TERIA and its commitment to scientific research in environmental protection
- TERIA and its commitment to scientific research in environmental protection
- TERIA and its commitment to scientific research in environmental protection
- TERIA and its commitment to scientific research in environmental protection
- TERIA and its commitment to scientific research in environmental protection
- TERIA and its commitment to scientific research in environmental protection
- TERIA and its commitment to scientific research in environmental protection
- TERIA and its commitment to scientific research in environmental protection
- TERIA and its commitment to scientific research in environmental protection
TERIA and its commitment to scientific research in environmental protection
TERIA’s involvement in the environmental sector
Since its inception, TERIA has contributed its expertise to measurement expeditions in a variety of natural environments: Arcouzan, Dune du Pilat, Pic du Midi d’Ossau, Mont Ventoux, the Barre des Ecrins, etc.
The aim is to better understand and protect these sometimes fragile environments. It’s a mission that’s close to TERIA’s heart.
THE DUNE DU PILAT IN CONSTANT MOTION
On 13 October 2015, theOrdre des Géomètres-Experts orchestrated a large-scale observation campaign on the Dune du Pilat. The results, unveiled in February 2016, mark a decisive step towards understanding the environmental and cultural dynamics of this emblematic site. The aim of the operation was to measure the movements of the dune and analyse its deformations, with a view to modelling this giant of sand using data collected by a remotely piloted drone connected to the TERIA network.
The Dune du Pilat is a geomorphological site of great fragility and a major tourist attraction. The issues at stake in this campaign were many and of crucial importance for the future of this jewel of the Landes region. The aim was to preserve the quality of the site while reconciling protection with public access, to enhance its cultural and scientific dimension, to anchor the dune in its territory and to ensure sustainable management of this unique natural area.
Thanks to the data collected, the teams were able to create a detailed digital model of the Dune du Pilat. The results reveal its impressive dimensions: a peak culminating at 110.19 metres, a length of 2,915 metres, a maximum width of 616 metres, and a colossal volume of 55 million cubic metres. This modelling paves the way for more informed management and better preservation of this exceptional site.
THE MYTHICAL MONT-VENTOUX
A legendary route
At the request of the mayor of Bedoin, a famous village at the foot of Mont Ventoux, several teams of surveyors from the Vaucluse and EXAGONE-TERIA took part in measuring the mountain to determine the exact altitude of the highest point of the access road to its summit.
Thanks to the TERIA network’s GPS stations and receivers, and the efforts of everyone involved, the surveyors placed markers at four strategic points: the first at kilometre 0 (the start of the climb), the second at the Saint-Estève bend, the third at the Reynard chalet and finally one at the top of the D 974 road.
The results came in on 10 June 2016: the finish of the route culminates at an altitude of exactly 1,897.1 metres and not 1,912 metres as indicated, which is actually the altitude of the highest point on the mountain. Cyclists wishing to climb Mont Ventoux will therefore have the pleasure of enjoying a difference in altitude of 1,587.7 metres.
THE 70TH ANNIVERSARY OF THE OGE AT PIC DU MIDI D’OSSAU
At the cutting edge of technology
To mark the 70th anniversary of the Ordre des Géomètres-Experts (OGE), a new measurement campaign was carried out on the Pic du Midi d’Ossau in September 2016. This event mobilised the geometers-experts of the Pyrénées-Atlantiques departmental chamber, in collaboration with their partners, including the TERIA Network.
For two days, the teams in the field were responsible for measuring the entire Pic du Midi d’Ossau massif. To do this, they first placed targets on the ground and then geolocated these points with precision. They then used a drone to capture aerial images of the massif. These photographs, combined with measurements on the ground, were used to create a 3D digital model, faithfully representing the relief right up to the summit of the peak, which rises to an altitude of 2,883.84 metres.
The event also marked an important milestone for EXAGONE and the TERIA Network, who took the opportunity to present and implement TERIAsat for the first time. This innovative new service aims to improve the accuracy of geo-positioning through the use of satellites, opening up new prospects for surveyors and their future activities.
THE ARCOUZAN GLACIER LIKE NO OTHER
Every year since 2011, an expedition has been carried out on the Arcouzan glacier, near Mont Valier. It brings together surveyors, scientists and technicians.
This glacier, the most isolated in the Ariège Pyrenees, is situated at an altitude of 2,500 metres. It is an excellent site for carrying out measurement campaigns to better understand and protect the glacier, an environmental issue close to EXAGONE’s heart.
At the end of September 2016, for three days, our TERIA Network team assisted the surveyors to help them measure the glacier. thanks to three new innovations including TERIAsat, a service to increase the accuracy of satellite geo-positioning.
The experts were able to make a reassuring observation: until 2016, the glacier had not been affected by global warming and its surface area had not stopped growing. Despite a slight fall at the end of September 2016, the scientists remain optimistic, pointing to a trend that is moving in the right direction.
The latest measurements of the glacier’s surface area
Year
Surface area m2
2011
18600
2012
19700
2013
25200
2014
28100
2016
24800
THE BARRE DES ÉCRINS UNVEILED
In the early 19th century, the Barre des Écrins was measured for the first time in August 1828 from the Pelvoux by Captain Adrien Durand, followed by a new measurement in 1905 by Paul Helbronner. For over a century, the generally accepted altitude has been 4,102 metres.
Recently, an expedition was organised to obtain more precise measurements of the peaks of the Écrins massif, all of which are above 4,000 metres. Initiated by EXAGONE in collaboration with Géomètres-Experts and Géomesure, the aim of this mission was to redefine the altitudes of the main peaks.
Scheduled for 2, 3 and 4 July, the expedition was cancelled due to poor weather conditions, recalling the cancellation of the 2014 expedition. Despite these setbacks, the Géomètres-Experts attempted new ascents on 23, 24, 30 and 31 July, but failed due to the weather and the injury of expedition leader Michel Baud.
Finally, on 23 August, a small group comprising Michel Baud, Ilario Previtali, Stéphane Carde and Vincent Gaillard reached the summit and collected data with millimetre precision, thanks to the support of the TERIA Network. The new measurements revealed that the Dôme de neige reaches a height of 4,009.30 metres, the Pic Lory measures 4,086.87 metres, and the Barre des Écrins, the highest peak, rises to 4,101.17 metres.
For a number of years, TERIA has played an essential role as a key player and partner in many measurement expeditions. The main objective of these collaborations is to provide valuable and reliable data to researchers and scientists, thereby contributing to the advancement of knowledge in various fields of research.
