an engineer who determines the boundaries and elevations of land or structures
"The surveyor marked the property lines before the construction crew could begin digging the foundation."
someone who conducts a statistical survey
"The government hired a surveyor to collect data on household incomes across the entire region."
A person occupied with surveying -- the process of determining positions on the earth's surface.
"The surveyor carefully measured the boundary lines before handing over the official plot map to the new homeowner."