Andrew, In this case, "manipulate" = "correct."
Unfortunately, the difference between what the tipping bucket and the manual gauge reads is not linear. So, multiplying readings by a constant number will not work. I likely will have to make the correction(s) after every day that it rains. On Monday, September 18, 2017 at 8:47:22 PM UTC-7, Andrew Milner wrote: > > I forgot to add > 1. Take a copy of the database before manipulating/updating values > 2. If you 'correct' the readings MAKE A NOTE OF THE DATE TO WHICH YOU DID > THE UPDATE and then on subsequent manipulations it would be > > UPDATE archive SET rain = rain * 2 WHERE dateTime > xxxxxxxxx; > > On Tuesday, 19 September 2017 06:43:46 UTC+3, Andrew Milner wrote: > >> Depends what you mean by 'manipulate'!! >> >> If you have a formula that would convert VP2 reading to match manual >> reading then the formula could be put into the calibration section of weewx. >> >> If you want to change existing readings already in the database then you >> can use SQLite to issue sql statements direcly >> eg to double all rain readings before epochdate xxxxxxxxx would be >> something like: >> >> UPDATE archive SET rain = rain * 2 WHERE dateTime < xxxxxxxxx; >> >> On Tuesday, 19 September 2017 06:02:13 UTC+3, TheChoctlab wrote: >> >>> My VP2 rain gauge, not unlike other tipping bucket gauges, is often >>> inaccurate. I have a Stratus RG202 manual gauge to compare it to. >>> >>> I understand that I will need to manipulate weewx.sdb to reflect the >>> readings from the manual gauge. But, I am not sure what exactly to >>> manipulate. >>> >>> >>> Guidance please. >>> >> -- 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.
