The stated accuracy of the Davis pressure gauge is 1 mbar, which, at sea-level, represents about 8m of altitude. And, it's one of the better pressure sensors.
The reduction to sea-level also assumes a "standard atmosphere," but in areas with terrain, nighttime temperatures can be considerably colder at the surface than the standard model would suggest, causing reduced SLP to be too low. This can be a 2-4 mbar error, or the equivalent of 16-32 meters. My point is, unless you're located in a high-rise building, errors caused by the difference between console and ground altitude will be small. Still, I'll put the change in. On Fri, Jun 30, 2023 at 7:33 AM [email protected] < [email protected]> wrote: > I think it makes sense to clarify this. I have set my station's altitude > to the elevation of the ground below the air temp sensor. My pressure > sensor is 5m above. The impact may vary from case to case, in my case I > guess the impact on the calculated sea level equivalent barometer value is > greater, than on the almanac values, and I should set the station altitude > to the elevation of the pressure sensor. > > Karen K schrieb am Freitag, 30. Juni 2023 um 15:17:28 UTC+2: > >> Regarding the station altitude the user's guide of WeeWX >> <https://weewx.com/docs/latest/usersguide.htm#%5BStation%5D> simly says >> "station altitude". >> >> The WMO distinguishes between the station altitude and the pressure gauge >> altitude. >> >> - The station altitude is defined as the elevation of the ground >> below the air temperature sensor. >> - The pressure gauge altitude is the real altitude of the pressure >> gauge, used to calculate sea level pressure (barometer value). >> >> The altitude in the [Station] section of weewx.conf is directly used to >> calculate the sea level pressure (barometer value) in the >> weewx.wxxtypes.PressureCooker class. So strictly spoken it is not the >> station altitude but the pressure gauge altitude, what the user has to put >> there. >> >> Would it make sense to clarify that in the user's guide? >> > -- > 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]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/weewx-user/5c6de53e-9268-4b6d-83e7-c1f5b0d608d4n%40googlegroups.com > <https://groups.google.com/d/msgid/weewx-user/5c6de53e-9268-4b6d-83e7-c1f5b0d608d4n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- 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]. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/CAPq0zEAx-Ybjp%2BodYj5Uqx7VNP%2BDrZ1JLmnc0yf4NA1MvawEFg%40mail.gmail.com.
