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mrgmarsh / wfrog

Automatically exported from code.google.com/p/wfrog
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wh1080 pressure and rain fudge factors are wrong #139

Open GoogleCodeExporter opened 9 years ago

GoogleCodeExporter commented 9 years ago 
What steps will reproduce the problem?
1. Configure wfrog with a wh1080 station and altitude from GPS.

What is the expected output? What do you see instead?
Relative pressure appears 4-5hPa higher than on nearby reliable barometers.

Removing the abs_pressure fudge factor of 4.5 that was added to wh1080.py in 
r810 brings the values back into a sensible range, closely matching expected 
values.

Rain is harder to judge, but from the limited data I have the fudge factor of 
1.36 just makes an already inaccurate instrument substantially less accurate. I 
knew both values were suspect immediately, as their implementation is weird and 
doesn't necessarily look well thought out (eg. the *10 and /10 for abs_pressure 
directly cancel out, and the rain correction would better be implemented as a 
straight *1.36).

What version of the product are you using? On what operating system?
svn r953 is bad, and going back to 0.8.2 works fine.

Original issue reported on code.google.com by m...@williamgrant.id.au on 21 Jan 2014 at 9:12