These standards which were used to measure and define property such as buildings and fields were adopted by the Greeks, Romans and Persians as legal standards and became the basis of European standards of measure. They were also used to relate length to area with units such as the khet, setat and aroura, area to volume with units such as the artaba and space to time with units such as the Egyptian minute of march, the itrw which recorded an hours travel on a river, and the days sail. Specialized units for carpenters, masons and other craftsmen such as the remen were worked into a system of unit fractions that allowed calculations utilizing analytic geometry. Carpenters and surveyors were some of the first dimensional inspectors.