The survey in which the earth's curvature is also considered is c

SOLUTION

Topographical surveys:

To show natural features of the country such as rivers, hills, streams, lakes, roads bridges, town, etc.

Plane Survey:

A plane survey is a type of survey in which the mean surface of the earth is considered as a plane and the spheroidal shape is neglected.

All triangles formed by survey lines are considered as a plane triangle.

Geodetic Survey:

The surveys in which the curvature of the earth is taken into consideration are known as geodetic surveying.

All lines lying on the surface are curved lines and the triangles are spherical triangles.

It is considered to be geodetic when the limit of the survey is more than 250 km².

Preliminary survey:

To collect adequate data to prepare plan / map of area to be used for planning and design.