It's easy to see why the pressure issue comes up all the time... >From the VWS manual regarding the VWS database format:
Column Parameter Number 9 Barometric Pressure 24 Sea-level Barometric Pressure 25 Pressure Altitude The manual goes on to define the following in it's glossary: Barometric Pressure. The pressure exerted by the atmosphere as a consequence of gravitational attraction exerted upon the "column" of air lying directly above the point in question. The measurement can be expressed in several ways. One is in millibars. Another is in inches or millimeters of mercury (Hg). Also known as atmospheric pressure. Pressure Altitude. Atmospheric or barometric pressure expressed in terms of altitude which corresponds to that pressure in the standard atmosphere. Sea Level Pressure. The atmospheric pressure at mean sea level either directly measured by stations at sea level or empirically determined from the station pressure and temperature by stations not at sea level. Used as a common reference for analyses of surface pressure patterns. I can probably make sense of it so far, in VWS speak 'Barometric Pressure' is what in weewx speak we call 'pressure', 'Pressure Altitude' is what we call 'altimeter' and 'Sea level Pressure' is what we call 'barometer'. Bu then the VWS tabulated daily text file includes a column titled 'Raw Barom', now things start to get confusing... Gary On Tuesday, 2 August 2016 08:31:28 UTC+10, Tom Keffer wrote: > > 5) any other gotchas in doing a conversion to weewx? >> > > ​Please note that field 'rain' is the amount of rain that fell *during > that archive interval*. That is, it's the amount of rain that fell in the > five minute sampling window. > > Also, see the Wiki > <https://github.com/weewx/weewx/wiki/Barometer,-pressure,-and-altimeter>for > the differences between the three different kinds of pressure: barometer, > pressure, and altimeter. > > -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.
