Objectives

The task of the OMIV Geodesy Data Centre is to acquire, store and disseminate observations on the landside displacement and deformation pattern using different technologies:

• permanent GNSS networks to monitor surface displacements (requested accuracy of the estimated East, North and Up coordinates: < 1 cm)
• permanent surveys of benchmarks installed at the landslide surface using automatic total stations (requested accuracy of the estimated East, North and Up coordinates: < 2 cm)
• campaigns of airborne and terrestrial LiDAR on the most active parts of the landslide to obtain images of the kinematics (requested accuracy of the estimated East, North and Up coordinates: < 4 cm)
• permanent monitoring using terrestrial optical cameras and image correlation techniques (requested accuracy of the estimated East, North and Up coordinates: < 4 cm)

These observations are performed in close collaboration with local stakeholders and risk managers, such as RTM04 for Super-Sauze and La Valette landsides, CEREMA Méditerrannée for the La Clapière landslide, and CEREMA Rhône Alpes for the Séchilienne landslide.

OMIV Instrumentation

Status in September 2013

GNSS receivers:

• Séchilenne (1)
• La Clapière (3)
• Super-Sauze (3)
• Avignonet (3)

Total station targets:

• Séchilienne (15 targets), 6 hour acquisition, 6 months delay for data access (partnership with CEREMA Rhône Alpes)
• La Clapiére (25 targets), 6 hour acquisition, 1 year delay for data access (partnership with CEREMA Méditerrannée)
• Super-Sauze (30 targets), 6 acquisition per year, 6 months delay for data access

Terrestrial LiDAR acquisitions:

• Super-Sauze (6 scans per year, 2 locations)

Cameras for terrestrial image correlation:

• Super-Sauze (3)

Data Processing

GNSS receivers

Total Station Targets

Terrestrial Lidar

Cameras for terrestrial image correlation