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Using mathematics, sophisticated technology, and equipment, surveying and land surveying include measuring and mapping our surroundings. Almost anything on land, in the sky, or below the ocean is measured by surveyors. Even the polar ice caps are measured. You can have more information about surveying companies Sydney from here. 

Land surveyors carry out both office and fieldwork. In the field, they map a region while performing calculations and collecting pictures as proof using the most recent technologies, including high-order GPS, Robotic Total Stations (Theodolites), and aerial and terrestrial scanners.