ratio_spect_stream::is_derived

Source: stream/spect/Ratio/ratio_spect_stream__is_derived.pro

 ratio_spect_stream::is_derived
        Return whether the stream is a "derived" stream.
 
 Usage:
        state = strref -> is_derived()

 Notes:
        Derived streams are things like spectral-index time series
        which do not have raw data, and consequently lock the dataset.

 History:
        Original: 3/5/02; SJT