There isn't any drop in relation with the center of gravity of the planet. As you move around,.down stays down.
I do not get what engineering project has such a dimension where the curvature of the planet is more significant than the orography of the area.
And.. for for longer distances I suggest you to take a captain license. You will discover they use Spherical Trigonometry.
As you are super thick, in will spell it out to you. How do they take account of the curvature 7.8m per 10km in EVERY direction in engineering, flying on a ball dummy. You know what a ball is?
Listen you dumb fuck. On your ball model. 10km away, UP is pointing in a different direction - How is that taken into consideration using Euclidean geometry used in Engineering? Level isnt singular on a ball but is used in Engineering... Show me how this is possible on your ball model?
Because it is irrelevant for any structure. When you draw on a paper do you consider the border of the paper or the center of the Galaxy as center for your coordinates? Engineers use any geometry they need..stuff that you do not even know exist. Stop reading stupid stuff around and believing all they write.
Thats a lot of cope. 
either way we are at the center.
If you don't know we also change the settings of scales based on location because earth is not round but an ellipsoid and this changes the distance of the surface from the center plus has different centrifugal forces based on the surface velocity at different latitudes and all this changes the gravitational force depending on the position on the planet that is almost spherical and acts as a spinning ball.
Why aren't you using heliocentric geometry numbnuts? You can't have parallel lines on a ball - Euclids 5th postulate!!! Fuck me you dumb as fuck
Heliocentric geometry does not exists. Is a word you made up.
Anyway has been interesting. People with medium low culture cannot grasp concepts that are too big and probably think engineers operate with middle school math.
Well as a personal satisfaction, due to the fact that I cannot beat you up as we did with stupid in the old times, I hope you will spend a beautiful life 9 to 5, cleaning toilets or turning patties. At least you are not going to be one of the workers around me because you will need something more than middle school math to read my projects. Take care, do not fall of the flat earth... There is Hercules there. Cheers
Spherical geometry cannot have parallel lines. Seek help for your mental illness
You claim a ball, but the world uses planar (Euclidean) geometry. https://video.nostr.build/bc0cbd7ea3fb356f0d13e499e4333c0e75a5d2ec0b1ef30e8d8b71b452262a52.mp4
