Why does the user need to specify a time period when accessing data from an SCF file?
The SCF definition (algorithm) is time-independent; that is, the algorithm can be applied to data taken at any time. However, the input sources that drive the computations are IDFS data products, which are dependent on the time range specified. Therefore, in order to access the IDFS data set, a time period must be provided and the computations are performed using the specified input sources during the requested time interval.