We don't have synonyms for geodesy yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are geodes.
(n) :
the scientific discipline that deals with the measurement and representation of the earth, its gravitational field and geodynamic phenomena (polar motion, earth tides, and crustal motion) in three-dimensional, time-varying space
(n) :
the scientific discipline that deals with the measurement and representation of the earth, its gravitational field and geodynamic phenomena (polar motion, earth tides, and crustal motion) in three-dimensional, time-varying space