Converts a tessellation on a linear network into a data frame.
Tessellation on a linear network (object of class
Further arguments passed to
A tessellation on a linear network is a partition of the network into non-overlapping pieces (tiles). Each tile consists of one or more line segments which are subsets of the line segments making up the network. A tile can consist of several disjoint pieces.
This function converts the tessellation
x to a data frame.
Each row of the data frame specifies one sub-segment of the network,
and allocates it to a particular tile. The data frame has the
seg column specifies which line segment of the network
contains the sub-segment. Values of
seg are integer indices
for the network segments in
t1 columns specify the start and end points
of the sub-segment. They are numeric values between 0 and 1
inclusive, where the values 0 and 1 representing the network vertices
that are joined by this network segment.
tile column specifies which tile of the tessellation
includes this sub-segment. It is a factor whose
levels are the names of the tiles.
The tessellation may have marks, which are attached to the tiles of the tessellation. If marks are present, the resulting data frame includes columns containing, for each sub-segment, the mark value of the corresponding tile.
A data frame with columns named
tile, and possibly other columns.
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