Closed alexdelprete closed 3 years ago
You have stumbled onto an issue with a bit of history. Yes you are correct that the GW1000 field light
is in fact illuminance and should be mapped to a field named illuminance
. The problem is that before WeeWX v4.2.0 the wview_extended
schema included a field luminosity
but did not include a field luminance
. WeeWX v4.2.0 included limited support for illuminance
(this consisted largely of assigning luminance
to the group_illuminance
unit group) but never actually included illuminance
in the wview_extended
schema (or any other schema for that matter). Interestingly, while illuminance
was assigned to a unit group, luminosity
was not assigned to a unit group. Earlier this year Tom and I had some off-line discussions over these discrepancies when the weewx-user thread you linked was started. Essentially we had two choices; we could modify the wview_extended
schema to include illuminance
and maybe/maybe not remove luminosity
with commensurate changes to the unit groups as well as GW1000 and fousb drivers. Alternatively, we could leave the wview_schema
as is (ie luminosity
but no luminance
), fix the unit groups to be consistent and leave the GW1000 and fousb drivers as is.
Ultimately the decision was made (some months after WeeWX issue 613 was closed) to adopt the latter, leaving the wview_extended
schema with luminosity
but no illuminance
accepting this was technically incorrect but avoiding a complicated upgrade procedure that would be required if there were changes to the wview_extended
schema. If you look at the current (v4.5.1) wview_extended
schema you will see it includes luminosity
and has no illuminance
.
One of the tasks that fell out of the decision to retain luminosity
was to include some some suitable explanatory words in the WeeWX documentation. This was to be the cue for me to include some appropriate words in the GW1000 driver documentation, but it appears the WeeWX documentation was never updated. I will take this up with Tom.
In the end you have solved your issue in exactly the way it should, through altering your GW1000 driver field map.
while
illuminance
was assigned to a unit group,luminosity
was not assigned to a unit group.
that's what triggered my attention to the problem: when the influxdb driver creates the records, you can see fieldname_unit
as the name of the record. But the luminosity
record didn't have the _unit
suffix. So I started investigating...
Question #1: why adding illuminance
to the schema is such a breaking change? In the past the schema has actually been changed, IIRC.
Question #2: has luminosity
been added to the unit group? Because in the last weewx version I still noticed that the influxdb driver exports the field without unit.
Gary, thanks a lot as always for the in-depth explanation, it really helps me understanding how things work with weewx, I appreciate it.
I was having problems with the default mapping (with Influxdb and Grafana) and found the Field Map page in the wiki.
I found out, reading a couple of posts by Tom, that the field that better represents the light sensor should be in reality be "illuminance", introduced in weewx 4.2, and not luminosity.
https://github.com/weewx/weewx/issues/613#issuecomment-716136794 https://groups.google.com/g/weewx-user/c/gcjK6o_1QXE/m/qMMW3Mg_BwAJ
I used a [[field_map_extensions]] stanza, under [GW1000], to remap it:
With this I solved the issue I had exporting data to influxdb, but I thought it would be useful to have your opinion about the default mappings.