The OPTOkopter has been developed for airborne, three-dimensional wind measurements and air quality monitoring. A high-precision, 3D wind sensor is carried by a drone that was built from scratch for this purpose. The drone was optimized for long flight times and precision flight. All wind measurements werde validated with the new wind lidar system of the Physikalisch-Technische Bundesanstalt (PTB), Germany's national metrology institute. The mean deviation of the measurements was shown to be below one percent. A RTK-GPS allows for centimeter-level accurate, automatic flights. During the wind measurements, the geometry of the environment is captured on the fly (Simultaneous Anemometry and Mapping - SAM). Precise airflow measurements are important to understand, predict and simulate flow phenomena.
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