- glg(series, tmin=None, tmax=None, fill_method='nearest', limit=0, output='mean', min_n_meas=16, min_n_years=8, year_offset='a-mar')#
Calculate the ‘Gemiddelde Laagste Grondwaterstand’ (Average Low GW Level).
series (pandas.Series with a DatetimeIndex) – The pandas Series of which the statistic is determined.
tmin (pandas.Timestamp, optional) – The lowest index to take into account.
tmax (pandas.Timestamp, optional) – The highest index to take into account.
fill_method (str, optional) – see .. :mod: pastas.stats.__gxg__
limit (int or None, optional) – Maximum number of days to fill using fill method, use None to fill nothing.
output (str, optional) – output type * ‘mean’ (default) : for mean of yearly values. * ‘yearly’: for series of yearly values. * ‘g3’: for series with selected data for calculating statistic. * ‘semimonthly’: for series with all data points (14th, 28th of each month).
min_n_meas (int, optional) – Minimum number of measurements per year (at maximum 24).
min_n_years (int, optional) – Minimum number of years.
year_offset (resampling offset. Use 'a' for calendar years) – (jan 1 to dec 31) and ‘a-mar’ for hydrological years (apr 1 to mar 31).
Series of yearly values or mean of yearly values.
- Return type
pd.Series or scalar
Classic method resampling the series to every 14th and 28th of the month. Taking the mean of the mean of three lowest values per year.