spatstat (version 1.48-0)

lintess: Tessellation on a Linear Network

Description

Create a tessellation on a linear network.

Usage

lintess(L, df)

Arguments

L

Linear network (object of class "linnet").

df

Data frame of coordinates of endpoints of the tiles of the tessellation.

Value

An object of class "lintess". There are methods for printing and plotting this object.

Details

A tessellation on a linear network L 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. The data frame df should have columns named seg, t0, t1 and tile.

Each row of the data frame specifies one sub-segment of the network and allocates it to a particular tile. The seg column specifies which line segment of the network contains the sub-segment. Values of seg are integer indices for the segments in as.psp(L).

The t0 and t1 columns specify the start and end points of the sub-segment. They should be numeric values between 0 and 1 inclusive, where the values 0 and 1 representing the network vertices that are joined by this network segment.

The tile column specifies which tile of the tessellation includes this sub-segment. It will be coerced to a factor and its levels will be the names of the tiles.

If df is missing or NULL, the result is a tessellation with only one tile, consisting of the entire network L.

See Also

linnet for linear networks.

plot.lintess for plotting.

divide.linnet to make a tessellation demarcated by given points. as.linfun.lintess, as.linnet.lintess and as.linim to convert to other classes.

The undocumented methods Window.lintess and as.owin.lintess extract the spatial window.

Examples

   # tessellation consisting of one tile for each existing segment
   ns <- nsegments(simplenet)
   df <- data.frame(seg=1:ns, t0=0, t1=1, tile=letters[1:ns])
   u <- lintess(simplenet, df)
   u
   plot(u)