In late May 2025, Dukendong Township in Gongshan County, Nujiang Prefecture, Yunnan, faced a severe natural disaster. Continuous heavy rainfall triggered flash floods and massive debris flows, severely damaging roadbeds, power lines, and communication infrastructure.

To support rapid disaster response, China Southern Power Grid Co., Ltd (CSG) deployed the JOUAV CW-15 drone, a VTOL fixed-wing drone designed for emergency mapping and aerial reconnaissance. Acting on urgent instructions from local authorities, the drone was tasked with surveying damaged power transmission lines and roadways in the affected mountainous area.

Yunnan Nujiang flood

Fast, Accurate Disaster Area Mapping

Emergency response teams required high-resolution 2D orthophotos of the disaster zone to guide road repairs, power restoration, and resource allocation. However, Dukendong Township’s steep, canyon-like terrain and persistent rainfall made manned inspections nearly impossible and challenged conventional UAV operations.

CW-15 in Yunnan Nujiang flood mapping

Undeterred by the harsh weather and complex topography, the CW-15 drone took off with its onboard CA-103 orthophoto camera system and covered a 77-kilometer stretch of damaged infrastructure. In just two flights, it captured over 2,300 aerial images, generating a 1:500 scale orthomosaic that provided precise geospatial data for responders on the ground.

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Seamless Air-to-Ground Coordination
The operation demonstrated the efficiency of multi-source drone deployment and real-time data interpretation. While multiple UAVs performed specialized aerial surveys, the ground team rapidly processed and interpreted data on-site, closing the loop between field collection and emergency planning.
Yunnan Nujiang flood mapping
This streamlined workflow enabled the fast production of accurate disaster assessment visuals, pinpointing:
  • Power line damage segments
  • Road interruption points
  • Terrain hazards affecting rescue logistics
Empowering Smarter Emergency Decisions
“With accurate data from the CW-15 drone, we were able to create more targeted rescue plans, allocate resources wisely, and gain crucial time to restore power and access,” said a field engineer involved in the operation.
In just a few hours, the CW-15 provided a clear, comprehensive overview of the disaster impact, helping guide power grid restoration, road clearance, and emergency relief logistics. Its long-endurance performance, all-weather capabilities, and precise imaging system proved invaluable in delivering full-cycle technical support from damage identification to action planning.
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