Explanation

 Plane Surveying - A method where Earth's curvature is ignored, treating the surface as flat;

suitable for small areas (<250 km²) with minimal error (used in construction, local mapping).

Explanation

 One central cross-hair and two stadia hairs (one above and one below).

Used in tachometry to measure distance indirectly.

The distance between the stadia hairs helps calculate the horizontal distance to the staff.

Explanation

 It is a surface where the gravitational potential is constant.

Always perpendicular to the direction of gravity.

The geoid is the most well-known level surface, representing mean sea level.

Explanation

 A contour line represents a line on a map or plan that connects points of equal elevation (RL) above a specific datum, 

usually mean sea level.

These lines help in showing the topography or relief of the land.

They are widely used in surveying, civil engineering, geography, and cartography.

Explanation

 A 14-foot three-piece staff means it has 3 equal sections.

Explanation

 Purpose: Maps natural features (mountains, rivers, lakes, forests) and man-made structures (roads, buildings).

Scale: Used for small to medium-sized areas (typically <250 km² where Earth's curvature is negligible).

Explanation

 if the figure is a regular shape, its area can be calculated using standard geometric formulas.

Short Detail:

Rectangle:

Area=Length× Breadth

Explanation

 Main feature: Allows precise line of sight adjustment without moving the entire instrument.

Explanation

 More accurate than the End-Area Method, especially with uneven terrain or variable cross-sections

Explanation

 A through compass is used to orient the plane table by aligning the drawing sheet with the magnetic meridian, ensuring that the table is correctly positioned relative to the Earth's magnetic north.