Special CRS values
The CRS handling in the wk package requires two sentinel CRS values.
The first, wk_crs_inherit(), signals that the vector should inherit
a CRS of another vector if combined. This is useful for empty, NULL,
and/or zero-length geometries. The second, wk_crs_auto(), is used
as the default argument of crs for constructors so that zero-length
geometries are assigned a CRS of wk_crs_inherit() by default.
wk_crs_inherit() wk_crs_auto() wk_crs_auto_value(x, crs)
x |
A raw input to a construuctor whose length and crs attributte
is used to determine the default CRS returned by |
crs |
A value for the coordinate reference system supplied by the user. |
wk_crs_auto_value(list(), wk_crs_auto()) wk_crs_auto_value(list(), 1234) wk_crs_auto_value(list(NULL), wk_crs_auto())
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