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After having performed the calculations it is usually necessary to
filter the velocity data in order to remove so called spurious vectors
(aka outliers). This can be done in MatPIV using four different
The two latter of these files include various methods, global or local,
for removing outliers. In this section we will take a look at how to use
the velocity filters in MatPIV. We note that all the filters will
replace the spurious vectors with NaNs (Not A Number).
- Signal-To-Noise ratio filter,
- Peak height filter,
- global filter and
- local filter.
Johan K. Sveen