On 1 Jul 2020 at 08:07:21, "R.Wieser"  wrote:
> I wrote:
>
>> Is the sensor supposed to be able to give that different results (internet
>> shows 1008, 1009 hPa around my position, the sensor shows 1000.47) ?    I
>> thought that the calibration process and resulting data would not allow
>> for it ?    What might be causing it ?
>
> As most all of you mentioned, I foolishly forgot all about not being at sea
> level and that pressure goes down the higher up you are.
>
> So I adjusted for that height too - only to conclude I still missed 4 hPa.
>
> Yeah, right ...   After some more pondering I realized that I was simply
> chugging on in the direction I entered this question with, and I should
> probably look at it from the other direction.
>
>
> Assuming that the readout of the sensor is correct (which is an easy
> assumption, seeing that its carefully calibrated) I must conclude that my
> (roughly estimated) altitude is the one thats incorrect.  That I compared my
> sensors readout with some data from the internet which was #1. rounded to
> whole numbers #2. had to be interpolated for my current location will surely
> not have helped either   I also just took the canals waterlevel as being at
> sea level.  Which ofcourse isn't quite true.
>
> An around 32 meter difference (4 hPa difference between my altitude-adjusted
> pressure and the one I guestimated from the internet) does seem like a lot,
> but missing a few meters here and there quickly adds up.
>
>
> Grumble ...   As the powers-that-be have not placed a weatherstation next to
> my building there is ofcourse no way to do some direct un-compensated data
> comparision ...  :-)

Have you checked with Google Earth for altitudes?

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