Dimension timeDim = dataFile.addUnlimitedDimension("time");
ArrayList dims = null;
// Define the coordinate variables.
dataFile.addVariable("latitude", DataType.FLOAT, new Dimension[] {latDim});
dataFile.addVariable("longitude", DataType.FLOAT, new Dimension[] {lonDim});
// Define units attributes for data variables.
dataFile.addVariableAttribute("latitude", "units", "degrees_north");
dataFile.addVariableAttribute("longitude", "units", "degrees_east");