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Update get_ground_diffuse description #1883

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3 changes: 2 additions & 1 deletion docs/sphinx/source/whatsnew/v0.10.3.rst
Expand Up @@ -28,4 +28,5 @@ Contributors
~~~~~~~~~~~~
* Arjan Keeman (:ghuser:`akeeman`)
* Miguel Sánchez de León Peque (:ghuser:`Peque`)
* Will Hobbs (:ghuser:`williamhobbs`)
* Will Hobbs (:ghuser:`williamhobbs`)
* Adam R. Jensen (:ghuser:`AdamRJensen`)
3 changes: 2 additions & 1 deletion pvlib/irradiance.py
Expand Up @@ -542,7 +542,8 @@ def poa_components(aoi, dni, poa_sky_diffuse, poa_ground_diffuse):
def get_ground_diffuse(surface_tilt, ghi, albedo=.25, surface_type=None):
'''
Estimate diffuse irradiance from ground reflections given
irradiance, albedo, and surface tilt.
irradiance, albedo, and surface tilt. The ground is assumed to
be isotropic and reflections are Lambertian.
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Suggested change
be isotropic and reflections are Lambertian.
be horizontal and flat, and reflections are Lambertian.

I don't think the word isotropic is appropriate here.

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why not?

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Adding "horizontal and flat" is a good idea. isotropic refers to properties such as albedo

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If you want to use the word isotropic I would suggest something more like: the surface is Lambertian and the reflected radiance is isotropic.

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I can live with that.

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Function to determine the portion of irradiance on a tilted surface
due to ground reflections. Any of the inputs may be DataFrames or
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