Hi, Garry,
thanks for your help, this is right solution of my issue, just small syntax
correction ( for other users)
[[[rain]]]
source_field = dailyrain
unit = mm
is_cumulative = True
With that option data was imported properly and summaries for imported
months are matching my own database.
I still need to build some old data cleansing method, but this is not
related to weewx itself. Just for curiosity, old weather station together
with Wdisplay sometimes (I never found source of issue) generated random
spike in rain data, where spike size was accumulated count of rain-gauge
pulses for outdoor sensor runtime ( simply some radio packet message had
part of payload populated by 0 and next packet was fully populated again,
most probably some missing CRC check on transferred data), in some days I
was happy and corrected data during day in WD, sometimes not. All this
spikes are part of my WD Logs. I need to find way how to clean data either
before or after import, I had some correction in my databases, but direct
export will cover only errors, which I forgotten/missed during days, not
these, which I manually corrected in WD, they are in dailyRain column as
negative changes.
Regards, Vaclav
po 23. 9. 2024 v 9:39 odesílatel gjr80 <[email protected]> napsal:
> The WeeWX field rain holds the total rainfall that was recorded during
> the corresponding archive period, so it is a per-period value rather than a
> cumulative value. The default WD import config file obtains the WeeWX rain
> field value from the WD log rainlastmin field, as both are per-period
> values it is a simple import. If the rainlastmin field is not available
> any WD cumulative rainfall field can be used; however, as such fields are
> cumulative you need to tell weectl import that the source rain field is
> cumulative. This is done with the cumulative option in the field map.
>
> Whilst a daily cumulative rain field can be used as the rain source, if
> multiple cumulative source fields are available the preferred approach is
> to use the source field with the longest period (eg monthly cumulative rain
> or yearly cumulative rain) to avoid possible issues at the cumulative field
> reset time. For WD I would suggest using (in order of preference)
> yearlyrain, monthlyrain, dailyrain.
>
> Try editing your WD import config file and change the [[[rain]]] stanza
> under [[FieldMap]] as follows:
> [[[rain]]]
> source_field = yearlyrain
> unit = mm
> cumulative = True
>
> Re-import the data and see how that goes. Note that you will need to
> delete the previously imported data before re-importing.
>
> Gary
>
> On Monday 23 September 2024 at 05:04:38 UTC+10 [email protected] wrote:
>
>> Hi,
>> Due slow death of my old weather station ( Lacrosse WS2-550, monitored
>> and saved for 14 years with Weather Display ) and death of dedicated laptop
>> (very similar age) running Weather Display, I'm trying to move to new
>> weather station (DYI Based ) and to weewx.
>>
>> I made weewx 5.1 working over weekend (connected by MQTTSubscriber/Driver
>> to my weather station), but I have failed with importing of historical
>> data. WD Import in documentation (
>> https://weewx.com/docs/5.1/utilities/weectl-import-wd/#mapping-data-to-archive-fields)
>> maps log file field *rainlastmin* to weewx field *rain*. Unfortunatelly,
>> this field is 0.0 in my log files and only accumulated *dailyrain* log
>> field is properly populated. I tried to map field *dailyrain *with
>> units *mm* and reimport (no errors during import), but it seems that
>> weewx field rain expects really delta in particular minute. I have checked
>> it on 1.1.2024, where 0.3mm rain happened on 19:57. I checked base
>> records, and between record 1187 and 1425 (last minute of day) is in
>> database stored value 0.03, so import works, but NOAA report ( and
>> archive_day_rain table) shows total rain value for day 7.17. After some
>> investigation, I found that 7.17 is close to (1425-1187)*0.03
>> I have changed all units to METRIC ( for me easier to calculate than US
>> units) , generated new database before running import.
>> My main questions/issues :
>> Any idea, how to fix import ?
>>
>> Is really weewx rain field expected to be *rain delta* from last period
>> (I need to adjust code of my Weather station to provide this form of data)
>> ?
>>
>> Thanks, Vaclav
>>
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