Answer: geodesy

AnswerCrossword Clue
GEODESYBranch of applied mathematics.
GEODESYEarth-measuring science
GEODESYScience of earth measurement
geodesythe branch of applied mathematics that deals with the measurement of the shape and area of large tracts of country, the exact position of geographical points, and the curvature, shape, and dimensions of the earth
geodesygeographical surveying