3 : Definition of terms

Question 1

process of directly or indirectly measuring vertical distances to determine the elevation of points or differences in elevation.

Answer 1

Leveling

Question 2

a curved surface which is at any point perpendicular to the direction of gravity or the plumb line

Answer 2

Level Surface

Question 2

a curved line in a level surface all points of which are normal to the direction of gravity and equidistant from the center of the earth

Answer 2

Level Line

Question 2

plane that is tangent to a level surface at a particular point

Answer 2

Horizontal Surface

Question 3

a line parallel to the direction of gravity

Answer 3

Vertical Line

Question 3

a straight line in a horizontal plane which is tangent to a level line at one point

Answer 3

Horizontal Line

Question 4

an imaginary surface of the sea which is midway between high and low tides

Answer 4

Mean Sea Level

Question 5

any convenient level surface coincident or parallel with mean sea level to which elevations of a particular area are referred

Answer 5

Vertical Datum

Question 6

vertical distance above or below sea level or any other selected datum

Answer 6

Elevation

Question 7

vertical distance between the two level surfaces in which the points lie

Answer 7

Difference in Elevation