A survey is a method of gathering information from a sample of people, traditionally with the intention of generalising the results to a larger population.Surveys provide a critical source of data and insights for nearly everyone engaged in the information economy, from businesses and the media to government and academics. Instruments used in survey Theodolite Total station Transit level Auto level Dumpy level The instrument that is mostly used in survey is Total station. About Total station A total station is an optical surveying instrument that uses electronics to calculate angles and distances. It combines the functions of a theodolite with that of a transit level and electronic distance meter (EDM). Function of total station : Angle measurement Most total station instruments measure angles by means of electro-optical scanning of extremely precise digital bar-codes etched on rotating glass cylinders or discs within the instrument. The best quality total stations are
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