• Multiple Groups provide multiple unlimited dimensions
• Multiple unlimited dimensions are also permitted within a single Group
• A single variable may also use multiple unlimited dimensions

  dimensions:
    time = unlimited;
    station = unlimited;
  variables:
    float temperature(time, station);
    double time(time);
    string station_id(station);  
  

• Supports emulating tables in the relational data model, each table with a different number of rows, with efficient addition of new rows

2009 Unidata NetCDF Workshop for Developers and Data Providers > Introduction to NetCDF-4