Detailed information about the survey term C. P.( Change point or control point)

Detailed information about the survey term C. P.( Change point or control point)  

C. P. -Change Point


A Change Point ( C.P.) is a term that is used in survey work. It is a  point which shows the shifting of the level. It is a point on which fore sight and back sights are taken. Any fix, stable and well defined object such as boundary stone, any concrete object, curb stone, rail, rock, etc., is used as a change poin.

C.P.-  control points

Control point 

Control Points ( C.P.) are the  fixed points of known coordinates (considering X, Y, and Z Co-ordinate) . This type of  information can give data of  elevation or can give  data of all coordinates. Control points are determined by high-precision surveys.

Generally , control points for a construction project can be established conveniently around the project area with high-precision. Such points would then be used throughout the project for referencing subsequent survey work, such as locating foundations, pipes, and fixing of other  items related to construction work etc.

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Mukesh Kumar Tarkar