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small docstring and formulation update #91

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small docstring and formulation update #91

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6 changes: 3 additions & 3 deletions pyet/radiation.py
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Original file line number Diff line number Diff line change
Expand Up @@ -168,7 +168,7 @@ def hargreaves(tmean, tmax, tmin, lat, k=0.0135, method=0, clip_zero=True):
lat: float/xarray.DataArray
the site latitude [rad].
k: float, optional
calirbation coefficient [-].
calibration coefficient [-].
method: float, optional
0 => after :cite:t:`jensen_evaporation_2016`
1 => after :cite:t:`mcmahon_estimating_2013`.
Expand Down Expand Up @@ -208,10 +208,10 @@ def hargreaves(tmean, tmax, tmin, lat, k=0.0135, method=0, clip_zero=True):
ra = ra.values[:, None, None]
else:
ra = ra.values
chs = 0.00185 * (tmax - tmin) ** 2 - 0.0433 * (tmax - tmin) + 0.4023
if method == 0:
pet = k / 0.0135 * 0.0023 * (tmean + 17.8) * sqrt(tmax - tmin) * ra / lambd
elif method == 1:
chs = 0.00185 * (tmax - tmin) ** 2 - 0.0433 * (tmax - tmin) + 0.4023
pet = k * chs * sqrt(tmax - tmin) * ra / lambd * (tmean + 17.8)
else:
raise Exception("Method can be either 0 or 1.")
Expand Down Expand Up @@ -329,7 +329,7 @@ def makkink(tmean, rs, pressure=None, elevation=None, k=0.65, clip_zero=True):
elevation: float/xarray.DataArray, optional
the site elevation [m].
k: float, optional
calirbation coefficient [-].
calibration coefficient [-].
clip_zero: bool, optional
if True, replace all negative values with 0.

Expand Down