st_coordinates | R Documentation |
retrieve coordinates in matrix form
st_coordinates(x, ...)
x |
object of class sf, sfc or sfg |
... |
ignored |
matrix with coordinates (X, Y, possibly Z and/or M) in rows, possibly followed by integer indicators L1
,...,L3
that point out to which structure the coordinate belongs; for POINT
this is absent (each coordinate is a feature), for LINESTRING
L1
refers to the feature, for MULTILINESTRING
L1
refers to the part and L2
to the simple feature, for POLYGON
L1
refers to the main ring or holes and L2
to the simple feature, for MULTIPOLYGON
L1
refers to the main ring or holes, L2
to the ring id in the MULTIPOLYGON
, and L3
to the simple feature.
For POLYGONS
, L1
can be used to identify exterior rings and inner holes.
The exterior ring is when L1
is equal to 1. Interior rings are identified
when L1
is greater than 1. L2
can be used to differentiate between the
feature. Whereas for MULTIPOLYGON
, L3
refers to the MULTIPOLYGON
feature and L2
refers to the component POLYGON
.
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