Definition: Compose a new way to ask the same question. The new question must be asking the exact same thing as the original question does. Without any other information, you should be able to tell that the original question and the new question are the same. Preserve bracketed phrases in your new question. You can change the rest of the question provided the above requirements are satisfied. The new question must have a natural, fluent formulation, as if it were composed by a native English speaker. You will be given three pieces of information to help you create better questions. Those are: "Answer": the answer to the question, e.g., "Honolulu". "Answer Type": the type of the answer, e.g., "Location". "Auxiliary Information" is a detailed description of some concepts mentioned in the question, if any.
Input: original question: what system does have [Decametre] measurement unit?
answer: international system of units, gravitational metric system
answer type: Measurement System.
auxiliary information: A decametre or dekametre is a very rarely used unit of length in the metric system, equal to ten metres, the SI base unit of length. It can be written in scientific notation as 1 E+1 m, meaning 10 √ó 1 m. This measure is included in the SI mostly for completeness: in principle, any combination of prefix and unit can be written, but many are rarely used in practice. One practical use of the decameter is for altitude of geopotential heights in meteorology. Meteorologists also use another seldom encountered SI prefix: hecto- in hectopascal. The volumetric form cubic decametre is convenient for describing large volumes of water such as in rivers and lakes. For surface the square decametre is a common unit, albeit by the name are. The are is a measurement of area the size of 1 decametre by 1 decametre ‚Äî the square decametre ‚Äî 10 metres by 10 metres, equalling 100 square metres. The standard metric unit of land registry, the hectare, is thus equivalent to 100 dam¬≤. For volumes the cubic decametre is also used, 10 m by 10 m by 10 m, equalling 1,000 cubic metres. One cubic decametre is equal to 0.811 acre feet.

In what measurement system is the [Decametre] unit used?