Diss-length

This is the length of data over which one estimate of dissipation rate is made for each shear probe. Choosing the length of data, in units of meters, for the estimation of dissipation rates makes this choice fairly platform and vehicle independent, and allows it to be mainly driven by the science one wishes to accomplish.

Using our recommended fft processing, each FFT-length segment will have 1.9 degrees of freedom (dof). Normally a single fft-length as diss-length is ill-advised and has poor statistical reliability. As a general rule, we recommend a diss-length of minimum 3 fft-lengths. Five fft-lengths is desirable. It may sometimes, however, be desirable to achieve high temporal (or spatial) resolution in dissipation profiles and/or the user chooses not to apply the Goodman algorithm. In those cases the user may choose single diss-length = fft-length, with the caveat of the poor statistical reliability of the dissipation estimate.

---

return to Flow chart for shear probes