A geoid surface is a mathematical model.Group of answer choicesTrueFalse

Match the following surfaces to their correct definition as used in geometric modelingRuled SurfaceAnswer 1PlaneAnswer 2Answer 3

Which of the following statements is correct?Group of answer choicesThe Geoid matches the EllipsoidAn Ellipsoid matches Mean Sea LevelGeoid is sometimes above and sometimes below the earth's surfaceAn Ellipsoid is always above the earth's surfaceNext

........................ is the mathematical representation of the physical relationships that exists between the geographical elements.

A n_ _ - m_ _ _ _ _ _ _ model provides detailed surfaces and edges within a solid model, in addition to the bordered surfaces.

DEM stands for ______________________.Group of answer choicesdigital earth modeldigital elevation modeldigital euclidean modeldigital eclipse model