Temperature spike: how do I repair that? (partially solved)

WS Grave · Post by **WS Grave** » Sat Dec 05, 2009 11:38 am

Last night I had a spike of more than 20 degrees Celsius. How and where do I repair the data?

WS Grave · Post by **WS Grave** » Sat Dec 05, 2009 12:21 pm

Ah, found it. deleted that, and now it's ok.

But the windchill still gives a 21.5 degrees Celsius.
Does anyone know how I can change that?

bensca · Post by **bensca** » Sat Dec 05, 2009 3:21 pm

If you delete the wind values, so the windchill is deleted, too. But the wind speed and direction, too :(
But I don´t see another way...

WS Grave · Post by **WS Grave** » Sat Dec 05, 2009 4:01 pm

Thank you Bensca, I deleted all data for that time period (1.5 minutes) and have clicked the Recalculate button. Will see in a few minutes if that did the trick.

Have you any idea how it is possible to get wrong data like this? It was in the middle of the night, and no activity in the house. Strange...

PS.
When I delete some minutes of data, the windchill will pick the first data next in line and still gives 21.5 degrees C. (while it should be around 8 degrees).

Maybe someone else knows how to correct the max windchill !?

HeinrichH · Post by **HeinrichH** » Sat Dec 05, 2009 4:52 pm

WS Grave wrote: Have you any idea how it is possible to get wrong data like this? It was in the middle of the night, and no activity in the house. Strange...

Spikes or wrong data interpretation can always happen on wireless systems even the transmitters sends a checksum with the signal. Mostly you can see a wrong transmission in the Meteohub log with a message like this: logger (05.12.2009 10:03:14): station 0 (RFXCOM), wrong checksum (fe vs computed 3e) for sensor model 1a99 (WTGR800) in byte sequence: 58 1a 99 04 b0 70 c0 16 00 02 fe ff
Some older type Oregon Scientific transmitters like THWR288 are sending the data 2 times but the new one's like the THGR810 is only sending once.

It's just something thats happen, special with simple wireless communication of sensors with no feedback. Thats why the most industrial wireless sensors use a mess network with feedback signals.

WS Grave · Post by **WS Grave** » Sat Dec 05, 2009 5:00 pm

OK, thank you.
By the way, I just checked the files in the map "weather" and saw the 21.5 degrees in all the wind files. Corrected them, but I'm not sure if I should have corrected the raw data instead...

/edit:
Ha, how stupid.
I don't know how I did it, but the high value is gone and the right one is showing now :laugh:

I did not alter the raw files, because that is almost impossible, it seems.
I stopped the logging and went to "Inspect data".
I had deleted the wrong data before. It was marked as deleted, but not yet deleted.
But somehow I did the right thing and my data is correct again :silly:

bensca · Post by **bensca** » Sat Dec 05, 2009 7:11 pm

You can delete manually all wrong values in the raw file. But stop data logging meanwhile!
After a recalculation of the weather data, the wind files will be correct, too.
If you only delete the data in the wind files, there will be the wrong values tomorrow again. You must delete the data in the raw file.

meteohub.de

Temperature spike: how do I repair that? (partially solved)

Temperature spike: how do I repair that? (partially solved)

Re:Temperature spike: how do I repair that?

Re:Temperature spike: how do I repair that?

Re:Temperature spike: how do I repair that?

Re:Temperature spike: how do I repair that?

Re:Temperature spike: how do I repair that?

Re:Temperature spike: how do I repair that? (partially solve