https://weewx.com/docs/5.0/usersguide/weewx-config-file/stations-config/#altitude
On Fri, Jun 30, 2023 at 7:49 AM Tom Keffer <[email protected]> wrote: > 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/CAPq0zEBPFsgcY_A%2Bsxtzv6fe20qwpLPxZtmK0hkjerO4wDrZ7A%40mail.gmail.com.
