A examining is taken from the new area of the extent and the peak change is accustomed to find the new elevation of the level gun, which is why this process is called differential levelling. This can be recurring right until the series of measurements is done. The extent https://landsurveyservicesbanglad88765.newsbloger.com/29959005/5-tips-about-land-surveying-solutions-bd-you-can-use-today