GVI Uses Lidar Technology to Aid in the Sichuan, China Landslide Relief Effort
On June 25th, thousands of rescuers began searching through rubble to find missing villagers after a Landslide devastated Xinmo village, in Sichuan Province, southwestern China. On the morning of June 26th, a UAV with eight propellers was deployed in the Maodian Mountain collapse site to provide greatly needed assistance to those rescuers. GreenValley International was on site to provide much needed assistance using our LiAir Pro UAV. The LiAir Pro can operate remotely, automatically navigating in accordance with the coordinates of the route flight. As a result, GVI was able to scan the entire collapse area in only 30 minutes.
According to GVI’s Liu Jiting, there are many advantages to using Lidar scanning techniques for these types of search and rescue operations.
“Through Lidar scanning and data processing, we can detect any slight changes in the area, changes at the centimeter level. Liu Jiting told reporters, “due to the dense trees, traditional remote sensing technology can not measure the actual terrain under the forest. Using lidar we can automatically remove the space occupied by the trees, allowing us to measure the village’s original shape and obtain accurate terrain data. “
The LiAir Pro uses the Riegl Vux-1 and has a measurement rate of 500,000 points per second. Using this fast and dynamic collection of large scale, high-precision point cloud data, GVI is able to achieve centimeter-level modeling accuracy, model the actual characteristics of the object and at the same time get the absolute coordinates of the object.
In addition, through 3D lidar scanning, the terrain can be quickly and accurately mapped. From there we can develop several digital models including 3D topographic maps. These models allow us to measure the amount of earth which is excavated during the rescue effort. The search and rescue command center relies on these models for the successful implementation of their rescue plan.
Emergency Rescue Center
According to the Emergency Rescue Center Director Hou Jianming, “After the UAV (LiAir Pro) scans the area, we will have better organization for the rescue. Combining UAV and our first responders, we can effectively carry out critically time-sensitive life search. In addition, the UAV can be used to aid in safety monitoring work to prevent the occurrence of secondary accidents.”
At present, GVI is still on site, proudly assisting in the search and rescue effort.