How does OpenSky process ADS-B message with tc=0?

Hi

I'm curious about how OpenSky processes airborne position message with type code(tc) = 0. This type of ADS-B message commonly occurs when position information is not available or is invalid. And this type of message commonly sets all 56 bits of the ME field bits to 0. I was wondering if OpenSky keeps those tc=0 messages as (latitude, longitude) = (0, 0) in 'position_data4' or just filters out this type of message.


Thanks!

Hi, I have the same question as liu1322. I wonder if messages with tc zero are filtered out by OpsenSky or if they are recorded somewhere in a database. Because I could not find any in position_data4.

Thanks a lot in advance!