A surveyor is someone who estimates or measures the dimensions of land. Surveyors help make maps, and are important when planning new buildings.
To survey is to measure the dimensions of land, including acreage and altitude. A surveyor is an engineer who measures such dimensions as a profession. The government needs surveyors to map the boundaries of zones and districts. When constructing new buildings, surveyors help determine how much land is being built on, what size the building should be, and how the altitude might influence the process. If you like math, planning, and building, you might enjoy being a surveyor.