The displayed altitude of FlightAware

Hi all,
A private helicopter has been annoying us for days with low-level flights over our area. FlightAware tracking shows an altitude of 300 meters. Is this the value above ground or above sea level?
Thanks
Thorsten

Depends on the data source. For ADS-B it will be uncorrected pressure altitude, which is approximately above sea level but needs to be corrected for local weather conditions.

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Thank you very much. Your answer will help me.

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