computed lightning data documentation

[theperk]

Hi,
I would have some questions about the meaning of some fields in the files we can download to access to the raw data.

I read the documentation on the Compendium page but I noticed some differences :
- the field "polarity", expected to be -1 or +1 is always 0 ?
- what is the meaning of the optional "status" field ? (which appears to be 0, 1 or 2)
- the status of the signal, explained to be in 3 bits, is always equals to 1, 2, 4, 9 or 12, so it's a 4-bits code and don't know the meaning of it ?

- When downloading archived data, there is a kmz file which is only 20 bytes, so it's empty ?

Thanks in advance if someone could explain me.