The term 'chainman' derives from previous utilization of measuring chains. An assistant would move the considerably finish with the chain beneath the surveyor's course. 30 many years back, GPS engineering was launched towards the survey planet—but only for many who could fork out tens of A huge number of bucks. https://heavy-duty34332.blog2freedom.com/30747731/5-simple-techniques-for-topographic-land-survey-bangladesh