Hi,
Yes the default mapping used by the GW1000 driver will map absbarometer to
WeeWX field pressure and relbarometer is mapped to WeeWX field relbarometer
(though in reality nothing will be done with relbarometer as it is
extremely unlikely the user would have field relbarometer in their database
schema). This was done deliberately to make use of WeeWX' ability to
calculate WeeWX field barometer if absolute or station pressure is known. I
fully expect that WeeWX would give a different barometer result to that
from the GW1000 as WeeWX compensates for temperature and altitude whereas
the GW1000 applies a simple linear offset that does not compensate for
temperature.
If having different values for barometer is particularly bothersome for you
can force WeeWX to use the GW1000 provided relbarometer as WeeWX field
barometer by adding a field mapping to the GW1000 driver config stanza in
weewx.conf as follows:
[GW1000]
...
[[field_map_extensions]]
barometer = relbarometer
You will need to restart WeeWX or do a config reload for the change to take
effect.
Gary
On Thursday, 17 December 2020 at 22:01:02 UTC+10 [email protected] wrote:
> Thank you from me aswell. I received my PWS yesterday, used the GW1000
> driver and was about to ask the same question, then I found this.
>
> I have one more question about pressure mapping.
> I noticed the driver maps "absbarometer" to "pressure" but the
> "relbarometer" to "relbarometer" aswell, which as far as I know is not used
> by default in Weewx.
> In the WeeWX wiki I found that it uses "pressure", "altimeter", and
> "barometer".
>
> Did you make these mappings so that you let the WeeWX recalculate the
> other parameters automatically from the "absbarometer"? This gives a
> different result then I have in WS View app (I guess the app only uses
> offset based on altitude, but weewx actually uses humidity and temperature
> aswell), now the problem is that the sea-level pressure is reported higher
> then other stations around me (including METAR), to correct this should I
> offset the absolute pressure in the WS View app? Or maybe used the
> corrections in weewx?
> I have problem with sending data PWSWeather, not sure what parameter for
> pressure it sends, but when I open the station on their website, open
> Observations, there is no reported pressure, then in the dashboard I see
> some pressure, but it is even higher than the one reported by WeeWX.
>
> Thank you
>
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