Two-dimensional spectrum time series
2D_Spec_Ser
The series is a time series of measurements in which each measurement has two dimensions such as directional wave spectra. In CF-compliant NetCDF this example data type would be stored in a 3D array with co-ordinates time, frequency and direction. As QXF is limited to two dimensions the data are stored in a 2D array with time as a rank 1 variable and two rank 0 variables (frequency and direction) that are both required to describe a single row. So, for directional wave spectra with 10 frequencies, 10 direction bins and 50 time steps the CF array would have dimensions (50,10,10) and the QXF array (50,100). Position and z co-ordinate are stored in metadata.