What correction did you do, and how do know that 'nothing happens'?

There are two main ways of correcting bad rain values - and both methods 
have advantages and disadvantages

Method 1
a.  Correct the rain (and possibly rain_rate) data fields in the archive 
table
b.  Drop the statistics
c.  Rebuild the statistics from the archive data - the yearly, weekly, 
monthly reports will be corrected when they are next created.

Method 2
a.  Correct the rain (and possibly rain_rate) data fields in the archive 
table
b.  Correct the data in daily_rain and daily_rainrate tables for the day(s) 
which were amended in step a.

Note that yearly, monthly and weekly reports are not generated every report 
cycle - so you may have to wait to see the correction(s).

IMO method 2 is best - but requires more care and more database 
manipulation.  Method 1 is simpler, but will lose any high/lows which were 
from LOOP data as all the high/lows will be taken from the archive data on 
the rebuild.

The units held in the database will usually be US Imperial, unless you have 
specifically created a metric or wxmetric database - so your 0.3mm will be 
in the database as .01 inches approx.



On Monday, 10 July 2017 12:36:55 UTC+3, Massimiliano Neri wrote:

> Hello TOM...
> Some time ago I had the same question ... but I did not understand a few 
> things ....
> I need to correct the data of my rain gauge, both daily, monthly and 
> yearly.
> Here is the problem, if I follow the correction that I was told, nothing 
> happens, and in the database I do not see the data in units of measure of 
> mm (milimeter) but maybe in inches.
> How can I correct, for example, the condensation of water caused by fog? 
>  for example how can i remove 0.3mm of rain that has not been?
>
> I attach 2 screenshots of my database.
>
> Il giorno martedì 27 giugno 2017 22:34:45 UTC+2, Massimiliano Neri ha 
> scritto:
>>
>> Hello...
>>
>> I have a FineOffset (Froggit) WH3080 connected with weewx. I would like 
>> to know how the software calculates the relative pressure from the absolute 
>> pressure. In fact I found that weewx calculates me at least 2hpa more than 
>> the weather stations in my area ....
>> Can anyone tell me if you can take the relative pressure from the wh3080 
>> console?
>>
>

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