The points which are used as a reference to conduct other kind of Survey are known as Control points.
These points are formed by triangulation or precise traversing.
High precision is required to form control points as other surveys are being conducted
with reference to these control points.
I don’t even understand how I ended up here, but I assumed this put up was once
great. I do not know who you are however certainly you’re going to
a famous blogger for those who are not already. Cheers!