Recently, in order to make rational use of the Yangtze River coastline and strengthen the maintenance of the Yangtze River ecology and river safety, the Zhenjiang Municipal Government urgently needs high-resolution orthophotos within 500 meters of the Yangtze River, and superimposes it as an image base map and water conservancy thematic information... The project area starts from Jurong City Avenue in the west and west to Xilaiqiao Town in Yangzhong City. The ground resolution requirement is 8 cm.

A drone with a wingspan of 2.5 meters rises slowly on the beach on the banks of the Yangtze River. This is a vertical takeoff and landing drone built for aerial surveying- MMC‘s’GRIFLION M8. This drone combines the advantages of multiple rotors and fixed wings: flexible take-off and landing, limited by the environment; fast flight speed, long battery life, can be equipped with high-definition cameras; with RTK+PPK system, one button At the same time of accurate take-off and landing, it meets the requirements of high-precision drawing.

Before taking off, the flying hand has uploaded the carefully planned route to the drone. According to the 8 cm resolution requested by the customer, the aerial overlap ratio is set to 75% of the heading, 70% of the sideways, and a total of 41 flying frames. After about an hour, thanks to the RTK centimeter positioning, the plane finally landed at the takeoff point. After a simple equipment inspection and disassembly work, the flying hand drove to the next takeoff point.

During the flight operation of the drone, there are often 6-7 winds and heavy rains. The Corbett mapping team completed the 400-square-kilometer flight in just 15 days, acquiring more than 21,000 high-quality drone images with an image resolution of 42 million pixels. Finally, the staff imported the data into the Pix4Dmapper for processing, and stitched all the scattered drone data into a continuous, standardized, measurable image map. It provides reliable information for the government to fully understand the development and utilization of the Yangtze River coastline.

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