Since July 2020, continuous heavy rains have caused landslides and floods in many parts of China. CHCNAV has been involved in one of the crucial steps in the disaster relief efforts of Enshi, a city located in the Central Province of China. CHCNAV's operational support saved valuable time for post-disaster survey and emergency management.
Enshi, a locality in Hubei Province, was affected by severe flooding and landslides over a large area due to heavy rainfall. The landslide formed a dam lake which seriously threatened the neighbouring villages.
The landslide in Enshi
Flood-affected villages in Enshi
CHCNAV sent UAVs and USVs atthe night of 23 July 2020 to participate in post-disaster reconnaissance operations with the objective of providing an extremely rapid response.
Complex and mountainous environments resulted in high-risk difficulties for the operation's work. Foggy and muddy roads seriously hampered post-disaster reconnaissance operations.
CHCNAV staff on site established 17 monitoring points around the landslide area. The landslide monitoring provided real-time surface movement data and allowed the plan to be implemented more effectively.
17 monitoring points around the landslides
The drone started operating with its LiDAR system
SVU went into action for operation
CHCNAV's UAV and USV contributed to the accurate calculation of lake, mountain, and landslide volumes on both sides of the river using integrated 3D data, collected from above and underwater. The UAV with LiDAR solution was applied to landslide detection and analysis for natural disasters. It took only an hour and a half to perform 3D mapping and geospatial data acquisition, from flight preparation to pre-processing results. The accuracy could be as high as 5 to 25 cm, which provided a valuable guideline for subsequent rescue work.
3D mapping data for comparison
Disaster relief efforts in Enshi using the combination of CHCNAV aerial and marine drones.Compared to conventional ways of deploying surveyors crews, these have highlighted three key advantages: safety, efficiency and accuracy.
Safety: The mountainous environment and the landslide compound were complex and unstable, resulting in a high risk of the operation. UAVs and USVs overcame the constraints of the external conditions.
Efficiency: The operational surveillance range reached 0.5 km² with the help of combined LiDAR UAVs and multi-beam USV. They provided highly accurate point cloud data in just one hour, significantly reducing operation time and saving manpower while providing valuable time for the follow-up work.
Accuracy: The GNSS ground-based disaster monitoring points achieved millimeter-level accuracy. Meanwhile, the UAVs and USVs reached centimeter-level accuracy meeting the requirements of emergency relief efforts.
About CHC Navigation:
Founded in 2003, CHC Navigation (CHCNAV) creates innovative GNSS navigation and positioning solutions to make customers' work more efficient. CHCNAV products and solutions cover multiple industries such as geospatial, construction, agriculture and marine. With a presence across the globe, distributors in more than 100 countries and more than 1,300 employees, CHC Navigation is today recognized as one of the fastest growing companies in geomatics technologies. For more information on CHC Navigation [Huace:300627.SZ], visit: www.chcnav.com.
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