Create a grid of time spent from an object of class
trip by exact
cell crossing methods, weighted by the time between locations for separate
tripGrid(x, grid = NULL, method = "pixellate", ...)
object of class
GridTopology - will be generated automatically if NULL
pixellate or density
pass arguments to density.psp if that method is chosen (and
temporary mechanism to direct users of legacy methods to
Zero-length lines cannot be summed directly, their time value is summed by assuming the line is a point. A warning used to be given, but as it achieved nothing but create confusion it has been removed. The density method returns proportionate values, not summed time durations.
pixellate.ppp for the details on the
method used. See
density.psp for method="density".
Trip events are assumed to start and end as per the object passed in. To
work with inferred "cutoff" positions see
tripGrid returns an object of class
one column "z" containing the time spent in each cell in seconds.
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