Organizing data by a named property such as region:
group USA { group Colorado { dimensions: time = unlimited, stations = 47; variables: float temperature(time, stations); } group Wyoming{ dimensions: time = unlimited, stations = 61; variables: float temperature(time, stations); } group Alaska { dimensions: time = unlimited, stations = 53; variables: float temperature(time, stations); } ... dimensions: time = unlimited; variables: float average_temperature(time); }