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Wind at altitude
1704 21 2021-1-25
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K6CCC
Second Officer
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United States
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In case you had any doubts that wind speed often goes up with altitude, check out this chart.  This was a very short flight from my house that I aborted because of the wind.  The red line is elevation, and the green line is wind speed.  





Wind vs altitude.png
2021-1-25
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DJI Stephen
DJI team
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Hello there K6CCC. Thank you for reaching out and for posting this interesting information about this matter. Again, thank you for your support and fly safe always.
2021-1-25
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DAFlys
Captain
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Dont forget you can use UAV Forecast to check windspeed and adjust the altitude to see the differences.
2021-1-26
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m80116
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Italy
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I knew at some point some would have a chart like this published. I hadn't any at the time and glossed on the UNAVOIDABLE consensus which otherwise makes you WRONG, DECEITFUL, HERETIC, let's burn him to the stake thing.

Well... it turns out I am not alone. I don't suggest going up as a comeback strategy but actually in some cases it might be an option worth trying, I am thinking of all those lost souls who dared to fly into the wind at sea where it's unforgiving and there is NO slowing down near the surface because it's flat.

Knowing the topography of a place probably also very important to understand the chart but I know this is better to remain undisclosed. Thanks for sharing.
2021-1-26
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virtual
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Czechia
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That's a big change in wind speed, thanks for sharing!
2021-1-26
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DowntownRDB
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Interesting.  Thanks for sharing.
2021-1-26
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jonny007
Second Officer
Germany
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I've never seen it be any different, which is more than logical. I don't think a single person will doubt it, maybe just underestimate it.
2021-1-26
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K6CCC
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DAFlys Posted at 1-26 00:30
Dont forget you can use UAV Forecast to check windspeed and adjust the altitude to see the differences.

True, but that is a forecast based on observations from other locations (unless you happen to be flying very close to an airport - or other weather station that feeds into whatever network UAV Forecast uses).
2021-1-26
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K6CCC
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virtual Posted at 1-26 05:16
That's a big change in wind speed, thanks for sharing!

Yea.  Where I took off was almost no wind, but I could see the trees moving, so I knew there was wind aloft..  I started getting essentially continuous high wind warnings once I got to altitude.  All I was trying to do was make sure the new DJI Fly app version was working, so it's not like I really needed to be flying.  Maybe I'll upload the video which shows how much the trees were moving.  I will say that despite the wind bouncing the Mini around a lot, the gimble did it's job and the video is mostly stable.
2021-1-26
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JohnLietzke
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United States
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I find UAVForcast’s wind estimated to often be inaccurate on both the ground and at different altitudes. I believe it is due to topographical variations better the sensor location and the flight location. The disparity is very pronounce in mountainous, hilly and areas close to the ocean.
2021-1-26
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K6CCC
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Uploaded the video of the flight.  You can see how much the trees were moving from the wind.

2021-1-26
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Donut Michigan
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Nice chart. I have that problem. On the ground it’s calm but at the top of the tall oaks in my neighborhood 120 feet tall you can hear the wind in the treetop.
2021-1-26
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DAFlys
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JohnLietzke Posted at 1-26 08:07
I find UAVForcast’s wind estimated to often be inaccurate on both the ground and at different altitudes. I believe it is due to topographical variations better the sensor location and the flight location. The disparity is very pronounce in mountainous, hilly and areas close to the ocean.

In Europe they release hundreds of balloons every day to measure wind/temp/altitude etc and they beam the data back by radio.  https://radiosondy.info
2021-1-27
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fans55d88441
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Croatia
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I think it's very unfortunate that DJI decided to hide this info from the DJI Fly app UI. The drone calculates it internally and sends it to the controller but it's never shown. The binary 'you are fine / you are not fine!' wind indicator is simply not useful enough. There is a big difference if there is a constant wind near the upper safe limit or very little wind with infrequent gusts. We really need at least a current wind speed estimate from the drone (forecast is nowhere need as accurate). A geek in me would even like to see a live wind speed vs altitude graph from within the fly app.
2021-1-27
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JohnLietzke
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I am in California in the Bay Area and have a second home in San Diego.  Weather for me is not a significant factor on a routine basis.  But it is always nice to have accurate information.  Observable weather is easy to gauge here and there are not rapid weather changes.  

But along the coast in wind speed due dramatically change.  It is nice to have accurate wind speed and direction for longer flights where a head, tail and crosswinds affect the battery consumption.  I like others would like DJI to implement a wind speed and direction in the DJI Fly app which is generated by resistance in realtime.  A snapable overlay like the Histogram for wind speed and direction would be a perfect solultion.
2021-1-27
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K6CCC
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fans55d88441 Posted at 1-27 07:17
I think it's very unfortunate that DJI decided to hide this info from the DJI Fly app UI. The drone calculates it internally and sends it to the controller but it's never shown. The binary 'you are fine / you are not fine!' wind indicator is simply not useful enough. There is a big difference if there is a constant wind near the upper safe limit or very little wind with infrequent gusts. We really need at least a current wind speed estimate from the drone (forecast is nowhere need as accurate). A geek in me would even like to see a live wind speed vs altitude graph from within the fly app.


Yep, that would be nice to have.
2021-1-27
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K6CCC
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DAFlys Posted at 1-27 01:26
In Europe they release hundreds of balloons every day to measure wind/temp/altitude etc and they beam the data back by radio.  https://radiosondy.info

As far as I know, they do here in the US as well, but it is getting data that is not overly current, and very likely no where near you.  The other thing to keep in mind is that real airplanes and our drones have a very different need for winds aloft information.  Real airplanes for the most part don't care about winds aloft until at least a few thousand feet up whereas we really want detailed information only up to a few hundred feet.  For our purposes, having data for ground level to let's say 500 feet AGL with readings every 25 feet at the location where you are flying would be great.  Aviation weather observations (including balloons) do not give that level of detail.
2021-1-27
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fans55d88441
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Croatia
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K6CCC Posted at 1-27 09:19
As far as I know, they do here in the US as well, but it is getting data that is not overly current, and very likely no where near you.  The other thing to keep in mind is that real airplanes and our drones have a very different need for winds aloft information.  Real airplanes for the most part don't care about winds aloft until at least a few thousand feet up whereas we really want detailed information only up to a few hundred feet.  For our purposes, having data for ground level to let's say 500 feet AGL with readings every 25 feet at the location where you are flying would be great.  Aviation weather observations (including balloons) do not give that level of detail.

I have even considered building a 'hacky' screen overlay for the DJI Fly with wind information taken from the log file in real time but unfortunately there is no open-source log file parser and the ones that do exist are not suitable for fast, non-interactive log file parsing. Even got in touch with CsvView creator but he said that the code would require a significant rewrite to be able to provide that info in close to real time. Unfortunately had to give up.
2021-1-27
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Cients
Second Officer
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Portugal
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Great K6CCC!
Thank you.
2021-1-29
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K6CCC
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Cients Posted at 1-29 16:30
Great K6CCC!
Thank you.

You're welcome.
2021-1-29
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oldhasbeen
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Australia
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The new attitude indicator gives a good estimate of wind strength and direction. Let the mini hover at any altitude and observe the attitude indicator. It will be on its neutral null position only if there is zero wind. To remain in position the mini must compensate drift caused by wind by appropriate attitude correction. The resulting attitude deviation from null indicate wind speed and direction in real time. Even gusts can be nicely observed.
2021-1-29
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K6CCC
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oldhasbeen Posted at 1-29 23:24
The new attitude indicator gives a good estimate of wind strength and direction. Let the mini hover at any altitude and observe the attitude indicator. It will be on its neutral null position only if there is zero wind. To remain in position the mini must compensate drift caused by wind by appropriate attitude correction. The resulting attitude deviation from null indicate wind speed and direction in real time. Even gusts can be nicely observed.

Good point.
2021-1-29
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