Question
Download Solution PDFLevel surface in terms of leveling is a ______.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Level surface:
- A level surface is the equipotential surface of the earth's gravity field. It is a curved surface and every element of which is normal to the plumb line.
- A body of still water provides the best example of a level surface.
Horizontal plane/ surface:
- A horizontal plane is a plane that is perpendicular to the plumb line. It is also tangential to a level surface at a particular point.
Mean sea level:
- It is the altitude of the earth's surface above sea level. MSL adopted in India is located in Mumbai.
Collimation surface:
- It is an imaginary surface passing through the intersection of the crosshairs at the diaphragm and the optical center of the object-glass and its continuation.
Datum surface:
- It is a level surface from which the vertical distances are measured for any point in the field
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