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 ...  :-)

Thanks for the help guys.

Regards,
Rudy Wieser

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