I read Gone's question differently in that I thought he was assuming that because the altimeter had not been set in the console the barometer readings issued by the station would have been incorrect up to the time he entered the altitude in the station, and he wanted to be able to calculate what they should have been by adjusting them in his database for the correct altitude - for which he wanted to know the formula to be used.
But I see from the hardware manual that although barometer is supplied by the station the altimeter and pressure vslues in weewx are software derived - implying that these will also be incorrect following any adjustments to barometer. Maybe I just totally misunderstood the original problem (as well as what a Vantage actually outputs)!! On Wednesday, 11 January 2017 15:29:47 UTC+2, Tom Keffer wrote: > You didn't say what kind of database, but assuming it's sqlite... > > You also didn't say what installation method you used, but assuming it's > setup.py... > > Make a backup of your sqlite database > > *cd /home/weewx* > *cp archive/weewx.sdb archive/weewx.sdb.backup* > > > Install the utility sqlite3 if it hasn't already been installed: > > *sudo apt-get install sqlite3* > > > Use it to patch your database: > > *sqlite3 archive/weewx.sdb* > sqlite> *UPDATE archive SET barometer=barometer+xxx;* > > sqlite> *.quit* > > > where xxx is the correction you wish to apply. > > Rebuild the daily summaries: > > *./bin/wee_database weewx.conf --drop-daily* > *./bin/wee_database weewx.conf --backfill-daily* > > > -tk > > > > > On Tue, Jan 10, 2017 at 10:59 PM, Gone Bush <[email protected] > <javascript:>> wrote: > >> The problem: I've had my Vantage Pro2 for a couple of months and finally >> got round to configuring the altitude in the console. >> >> (The Setup function doesn't step through that option.) >> >> Now what I want to do is correct the historical barometric data. >> >> So, to my question: What is the formula that will do that? (Google has >> failed me.) >> >> -- >> 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] <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > > -- 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]. For more options, visit https://groups.google.com/d/optout.
