I don't know much about GRASS, but I've been calling out to it from R with
`rgrass` to use `r.sun`. In particular, I use `r.sun` mode 2 to turn a
digital-surface-model raster I built from Rhode Island lidar data into an
irradiance raster. I notice that the manual says that the unit of `glob_rad` in
this case is Wh m^(-2) day^(-1). However, my input raster's CRS is EPSG:6568,
which is in feet. Does that mean the `glob_rad` unit is actually Wh ft^(-2)
day^(-1)? I'm on GRASS 7.8.2, which also produces a warning when ingesting the
input raster ("WARNING: Datum <Unknown_based_on_GRS80_ellipsoid> not recognised
by GRASS and no parameters found").
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