Retrieve weather station location from a GPS

[José Miguel Gonçalves]

I'm using weewx in a custom mobile weather station (based on a Airmar device) which has a GPS device builtin.
I would like to set dynamically the weather station's Latitude/Longitude/Altitude in the weewx web page from the GPS device instead of the setting it statically from the configuration file.

Can anyone give me some pointers on best way(s) to achieve that?

[vince]

Read the lat/lon programmatically from the GPS, write a quick sed script to hack on weewx.conf accordingly, then reset weewx.

[Tom Keffer]

The latitude and longitude are first read from weewx.conf, but then they are held in an instance of weewx.station.StationInfo. Normally, this object is treated as readonly but, off hand, I don't see why you couldn't change the values.

You could write a custom service that reads the GPS, then changes the values there. Thereafter, the updated values would be used.

-tk

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[Garry A Lockyer]

A VERY quick look at the Airmar driver and docs on Airmar website suggests the weather station communicates via NMEA sentences.  If yes, they probably use the standard sentences for GPS position - can’t remember their names but they are well documented.

Anyway, you might be able modify the driver to parse NMEA sentences and write to the variable Tom K mentioned.

Regards,

Garry Lockyer

C: +1.250.689.0686

E: Ga...@Lockyer.ca

On Apr 21, 2021, at 19:07, Tom Keffer <tke...@gmail.com> wrote:



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[José Miguel Gonçalves]

First of all, thank you all for your feedback.

Garry, I can not parse Lat/Long/Alt from the Airmar device because I'm using the 120WX model (that has no GPS builtin).

I've added an u-blox GPS module to provide location and use gpsd to retrieve it.

I will look into Tom's suggestion.

Best regards,

José Gonçalves

[Greg Troxel]

Garry A Lockyer <garrya...@gmail.com> writes:

> A VERY quick look at the Airmar driver and docs on Airmar website
> suggests the weather station communicates via NMEA sentences. If yes,
> they probably use the standard sentences for GPS position - can’t
> remember their names but they are well documented.
>
> Anyway, you might be able modify the driver to parse NMEA sentences and write to the variable Tom K mentioned.

If it's NMEA, I would suggest putting those bits into gpsd and using
gpsd's interface to get location. Yes, you could reimplement an NMEA
parser, and tt's not really that complicated, but the gpsd code base is
the encapulstion of wisdom about dealing with data from GNSS receivers.

[Tom Keffer]

Check out weewx-nmea-xdr. It parses NMEA XDR sentences. It could probably be easily adapted.

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[José Miguel Gonçalves]

Tom, my issue is not with getting Lat/Long/Alt from the GPS device.

For that I'm not parsing NMEA, instead I'm using this Python interface to gpsd:

https://packages.debian.org/buster-backports/python3-gps

My issue is how I can pass the location info to WeeWX in a way that it can dynamically update the location information on the webpage.

You have told me that I could update 'weewx.station.StationInfo' for doing that, but, as I'm not a Python coder, I envision difficulties in doing that.

Can you please provide me some sample code on how to do that?