Glenn,

Other things and a need to reacquaint myself with #491 
<https://github.com/weewx/weewx/issues/491> have delayed me getting back to 
you. You are correct that StdWXCalculate cannot calculate rate based fields 
other than rainRate. #491 considered a number of approaches for calculating 
delta fields from total fields (the case in hand being field rain from a 
rain total field) and a number of approaches were considered, these 
approaches impacted on some of the other StdWXCalculate functions and I 
suspect my comment earlier in this thread was based on some of the early 
development code written under #491. As it turned out the final #491 
solution resulted in the current hard coded rainRate approach.

Happy you look at generalising rate based calculation in StdWXCalculate and 
I have raised issue #813 <https://github.com/weewx/weewx/issues/813> to 
track this. Should have some time in the next week to work on this.

Gary

On Sunday, 13 November 2022 at 16:16:11 UTC+10 Glenn McKechnie wrote:

> On 29/06/2020, gjr80 <...> wrote:
> > I would not worry about raising anything Christian, the code I am 
> working on
> > would allow something like a rate based field to be calculated from some
> > other (user specified) field. You still have to add any necessary extra
> > fields to your database yourself, but StdWXCalculate could be configured 
> to
> > create the rate based field. No guarantees as it needs the Tom-tick but 
> it
> > looks good so far.
>
> Breathing life into an old thread...
>
> Did this idea get the "Tom-tick"?
>
> I'm using hail and hailrate.
>
> I've had a look at issue #491 and the new wxxtypes and wondering if
> that is what was being referenced here. I can't see a way to make hail
> (or snow!) work with it (RainRater) though. Hopefully some simple
> stanza under [StdWXCalculate] [[WXXTypes]]?
>
> I co-opted the hail field a while ago and have 5 years of data
> supplied via a modified OWFS driver.
>
> It would be helpful to have the hailrate to compare with the rainrate
> from the original rain gauge as I'm cleaning up some extreme rain
> values; which also means that issue #787 (wee_database --calc-missing
> does not correctly calculate rainRate) bites if I want the historical
> values?
> -- 
>
>
> Cheers
> Glenn
>
> rorpi - read only raspberry pi & various weewx addons
> https://github.com/glennmckechnie
>

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