The curvature of the Earth is already accounted for; my house sits upon a foundation of poured concrete which is leveled off and flattened locally. In this way,

The curvature of the Earth is already accounted for; my house sits upon a foundation of poured concrete which is leveled off and flattened locally. In this way, we also accounted for the gravitational geoid variation around the house. Honestly, I have to compensate more for the curvature of the floorboards!