A surveyor was someone who investigated and examined objects or places.
Professor Merrit Erskine was a planetary surveyor who was tricked into surveying Death's Deal by the Wraith Mining Cartel who then shot him down. (AUDIO: Death's Deal)
Dr Sophie Topolovic was part of the fifth galactic surveyor corps, and tried to shoot the Second Doctor, Jamie McCrimmon and Zoe Heriot, believing they were causing earthquakes on the planet she was surveying. (AUDIO: Shadow of Death)
Matthias Henson and Tanja Rubcjek were surveyors for the Terran Survey Corps. (PROSE: The Dimension Riders)
Simone Agani was the surveyor for the dig on Jaiwan. (PROSE: Genius Loci)