SimSeas: Simulate the seasonal component of a surrogate time series
In greenbrown: Land Surface Phenology and Trend Analysis

The function simulates the seasonal component of a time series based on a cosinus harmonic term.

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SimSeas(range, n = 360, 
    start = c(1982, 1), 
    freq = 12)

`range`	`range` of the seasonal cycle (seasonal amplitude)
`n`	length of the time series
`start`	beginning of the time series (i.e. the time of the first observation). The default is c(1982, 1), i.e. January 1982 which is the usual `start` date to compute trends on long-term series of satellite observations of NDVI. See `ts` for further examples.
`freq`	The frequency of observations. The default is 12 for monthly observations. Use 24 for bi-monthly observations, 365 for daily observations or 1 for annual observations. See `ts` for further examples.