geocat.comp.meteorology.max_daylight#

geocat.comp.meteorology.max_daylight(jday, lat)#

Computes maximum number of daylight hours as described in the Food and Agriculture Organization (FAO) Irrigation and Drainage Paper 56 entitled:

Crop evapotranspiration - Guidelines for computing crop water requirement. Specifically, see equation 34 of Chapter 3.

Note for abs(lat) > 55 the eqns have limited validity.

Parameters:

jday (numpy.ndarray, xarray.DataArray, list, float) – Day of year. Must be 1D
lat (numpy.ndarray, xarray.DataArray, list, float) – Latitude in degrees. Must be 1D

Returns:

sunmax (numpy.ndarray, xarray.DataArray, float) – Calculated maximum sunlight in hours/day

Examples

>>> from geocat.comp import max_daylight
>>> import numpy as np
>>> jday = np.array([100, 123, 246])
>>> lat = np.array([10, 20])
>>> max_daylight(jday, lat)
array([[12.18035083, 12.37238906],
       [12.37577081, 12.77668231],
       [12.16196585, 12.33440805]])

geocat.comp.meteorology.max_daylight

Contents

geocat.comp.meteorology.max_daylight#