A related question: Would it be difficult to hack weewx to use a mixture of hardware and software record generation? Specifically, to generate wind direction (and perhaps wind speed) records in software, while using hardware for everything else? I’m interested in doing this because the Davis station for some reason quantizes wind direction to multiples of 22.5º in the archive records, while the loop packets do not have this quantization. That seems silly and annoying, so I’ve thought about modifying my weewx to generate wind dir records from the loop packets. But please stop me now if there’s some subtle architectural or functional reason why this would be a bad idea…
-Les > On 10 Oct 2016, at 6:11, Thomas Keffer <[email protected]> wrote: > > If you use hardware record generation, then windSpeed is whatever is reported > by your hardware. If you use software generation, then windSpeed is the > average over the archive interval. > If you use hardware record generation, then windDir is whatever is reported > by your hardware. If you use software generation, then windDir is calculated > from the vector average. > Zero wind speed has an undefined wind direction. But, see option > ignore_zero_wind <http://weewx.com/docs/usersguide.htm#StdWXCalculate>. > No idea. > If you use hardware record generation and your hardware reports wind gusts, > then that is used. If you use software generation, then windGust is the > highest value seen in the archive interval. > If you use hardware record generation and your hardware reports wind gust > direction, then that is used. If you use software generation, then > windGustDir is the direction of the wind at the time the highest value was > seen in the interval. > All of the above is from the perspective of weewx. In your situation, where > you have to work with the raw data, I'm not sure this is much help. In > particular, watching the wind vane on my anemometer, it swings wildly. Some > sort of averaging, even if over a few milliseconds, is probably essential. > > Hope this helps. > > -tk > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
