GRIFLION M8 realizes large-scale aerial survey along the Yangtze River

Recently, in order to make proper use of the Yangtze River coastline,  and improve the maintenance of the Yangtze River’s ecology and river safety, the Zhenjiang Municipal Government urgently needs high-resolution orthographic images of 500 meters range of Yangtze River, and integrates it as an image base map and water conservancy thematic information. . The project area starts from Jurong City Avenue river in the 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 specially for aerial surveying – MMC “Griflion M8”. This drone combines the advantages of multi-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; also with RTK+PPK system, one button accurate take-off and landing, it meets the requirements of high-precision imaging.

Before taking off, the pilot has uploaded the meticulously planned route to the drone. According to the 8 cm resolution requested by the customer, the aerial surveying’s imaging overlap ratio is set to 75% of the heading, 70% of the sideways, and a total of 41 flights. After about an hour, with the benefits of the RTK centimeter positioning, the plane finally landed at the takeoff point accurately. After a simple equipment inspection and disassembly work, the pilot drove to the next takeoff point.

During the flight operation of the drone, there are often winds at level 6-7 and heavy rains. The MMC mapping team completed the 400-square-kilometer flight in just 15 days, acquiring more than 21,000 high-quality images at resolution of 42 million pixels. At last, 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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