"Premature optimization is the root of all evil." Your proposal sounds complicated and incompatible with the existing daily summaries. You would have to replicate a lot of what it already does.
Make it work first, then worry about making it fast. You don't know yet whether the calculation will take a long time. On Wed, Jan 19, 2022 at 9:38 AM Seth Ratner <[email protected]> wrote: > Your Phenology extension is actually what got me thinking about how to > implement the chilling hours in a more generic way, such that more than one > metric (or one set of temperature thresholds) can be used. > > The "simplest" way that came to mind was using some sort of modified Daily > Summary table in the database. I haven't yet figured out how WeeWX > populates those tables, but if the columns and calculation methods are > customizable, then the daily (or nightly) data could be compiled at the end > of the day and loaded into the table. That way every time you want to > display the information, it's just a straight query from that summary > table, rather than running the calculations every time for every archive > entry. This also allows for multiple calculation methods, all stored in the > summary table. > > So as an example, at the end of the day, whenever WeeWX normally populates > the summary tables, this new extension could run multiple algorithms (one > for basic chill hours, one for the Utah Model, one for the phenology table > on your website, etc) and store the resultant value in the respective > column (one for Utah, one for basic, one for phenology, etc) in the new > daily summary row for this extension. No new specific types are required in > the loop or archive packets, so the processing power is only required once > per day. When the data is viewed, it is only pulling values from a table > rather than doing the calculations each time. > > But I'm not sure such customizations to the daily-table-creation-process > is possible. > > Thoughts? > > > > > > > On Wednesday, January 19, 2022 at 9:20:30 AM UTC-6 [email protected] > wrote: > >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA1 >> >> On Tue, 18 Jan 2022 17:05:33 -0800 >> Tom Deffer <[email protected]> wrote: >> >> > Upon reflection, the biggest difference seems to be that >> > cooling-degree days are weighted by the temperature difference from >> > the baseline. You just want the total number of hours. >> >> > This is best done as an XTypes extension >> > <HTTP://git hub.com/weewx/weewx/wiki/WeeWX-V4-user-defined-types>. >> >> I've fooled around with XTypes for my Phenology extension. >> >> * [weewx-phenology](HTTP://LacusVeris.com/Phenology) — Growing >> Degree-Days development models for various insect pests, showing >> when to apply control strategies to minimize crop damage. >> >> The Growing Degree-Days calculation(s) are compute-intensive relative >> to the Cooling Degree-Days calculation. XTypes exposes three entry >> points that return values: scalar, series, and aggregate. I implement >> only the "series" entry point, and I keep a running tally of >> cumulative Degree-Days. It seems that, if I had implemented >> "aggregate," each cumulative step would have meant recalculating >> previous steps at factorial cost, but that's just me. >> >> I agree the Chilling Hours calculations seem relatively simple, but >> never let it be said that researchers in the Life Sciences can leave >> any particularly elegant concept uncluttered. Here is a more or less >> grammatical overview of various kinds of Chilling Hours calculations. >> You may overlook the Climate Change hysteria at the end. The Utah >> method obviously requires quite a few machine cycles, but matching the >> Queensland method's curve might require quite a few more. >> >> * [Chill Hours and Fruit >> Trees](https://practicalprimate.com/chill-hours/) — Many deciduous >> fruit trees will not give you the fruit yields you want unless your >> property receives adequate chill hours. But what are chill hours and >> why are they so important? >> >> ... so both Chill Hours and Growing Degree-Days potentially challenge >> WeeWX's data collection, calculation, reporting, and image generation >> capabilities. I developed a kludge to handle Growing Degree-Days >> because treating orchard insects and disease is a season-to-season >> battle and many treatments depend on such calculations. I am not so >> interested in Chill Hours because that has more to do with orchard >> siting and choice of cultivars, which tend to be one-off decisions. >> However, Chill Hours (in whatever manifestation) does keep coming up >> here and on the other discussion group I frequent. Perhaps this is >> due to ongoing Climate-Change concerns. >> >> * [Growing Fruit](https://growingfruit.org/search?q=chill%20hours) >> >> I wonder whether I have gone down the right chute with the Phenology >> Extension's Growing Degree-Days calculation and imaging capacity. >> Does adding Chill Hours call for a more general approach? >> >> I sadly fear the appetite for reporting Chill Hours does not >> necessarily imply the desire or ability to configure WeeWX to do the >> appropriate calculations or interpret the results. These are not >> straightforward things. >> >> - -- >> .. Be Seeing You, >> .. Chuck Rhode, Sheboygan, WI, USA >> .. Weather: http://LacusVeris.com/WX >> .. 15° — Wind WNW 22 mph — Sky mostly clear. >> >> -----BEGIN PGP SIGNATURE----- >> >> iF0EARECAB0WIQT+MY/5I/LMPSswTbVg2/xipKOWUgUCYegsMQAKCRBg2/xipKOW >> UuoSAJ4kvvWrCWqDkEZ8tl2yDzAPXU3LnQCeO5z01CamBSnFAr677iJNzwgf15U= >> =aptL >> -----END PGP SIGNATURE----- >> > -- > You received this message because you are subscribed to the Google Groups > "weewx-user" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/weewx-user/07e91ec6-4eca-4023-8bc0-691b5e8679ffn%40googlegroups.com > <https://groups.google.com/d/msgid/weewx-user/07e91ec6-4eca-4023-8bc0-691b5e8679ffn%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/CAPq0zEBUt7WVmzT8jG%3DBaK1A6c13enmqXQ6EHX9ycXLMpAZykw%40mail.gmail.com.
