The practice of cadastral surveying as defined by the Surveyors Act means "…the advising on, reporting on, conducting or supervising the conduction of surveys to establish, locate, define or describe lines, boundaries or corners of parcels of land or land covered with water".
Cadastral surveys can only be performed by an Ontario Land Surveyor.
Expropriation surveys are usually done as part of a larger route survey and are only used when all other methods of the government acquiring the land have failed.