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?

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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