A CONTROL POINT IS A POINT ON THE GROUND OR ANY PERMANENT STRUCTURE WHOSE HORIZONTAL AND VERTICAL LOCATION/POSITION IS KNOWN CONTROL POINTS ARE USED AS A STARTING POINT OF ALL TYPES OF SURVEYS.
Topographical Survey Ground Control Points Should Be Installed At 250 M Interval.(IRC:52-2019)
CONTROL POINTS.
THE SIZE OF THE PILLAR SHALL BE 45X45X90 CM IN M25 CONCRETE WITH
60 CM EMBEDDED IN THE GROUND AND30 CM ABOVE THE GROUND AND METAL PLATE AT TOP.(IRC:52-2019)
CONTROL PILLARS
CONTROL PILLARS IN CEMENT CONCRETE SHOULD BE FIXED AT SUITABLE INTERVALS (RANGING FROM 500 M TO 2 KM) TO HAVE CONTROL ON ACCURACY. IT ALSO HELPS IN REPEATING THE SURVEY, IF REQUIRED, WITHIN THE CONTROL PILLARS.
