People need to make an effort to understand things like wind gradient. But regardless, don't fly downwind if you don't need to, and if you must then stay LOS. These are simple operating procedures yet time and time again people don't apply common sense.
You should know the wind speed and direction before even taking off. As for airspeed, you don't need it because your frame of reference is with the ground, so groundspeed is what you need to know. Airspeed derived from anything other than a pitot system is likely to be highly inaccurate, not...
In terms of airspeed, the only accurate way of measuring it is with a pitot system. Wind speed could be measured by letting the drone drift with the wind whereby the ground speed would equal the wind speed. Really you should know what the wind is doing anyway and airspeed isn't all that useful...
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