Altitude is the (geometric) height above the geoid, which is the reference geopotential surface. The geoid is similar to mean sea level. 'Bedrock' is the solid Earth surface beneath land ice, ocean water or soil.
2
SDN:P07::CFSN0732
2
false
SDN:P07::CFSN0732
2020-06-22 17:33:46.0
SDN:P07::CFSN0732
2020-06-22 17:33:46.0
accepted
bedrock_altitude