Geodesy

[Sarah]

That branch of applied mathematics which determines, by meansof observations and measurements, the figures and areas of largeportions of the earth's surface, or the general figure anddimenshions of the earth; or that branch of surveying in which thecurvature of the earth is taken into account, as in the surveys ofStates, or of long lines of coast.

[Sarah]

the branch of mathematics dealing with the measurement and representation of the earth