consistent spatio-temporal overlay for STF, STS and STI objects, as well as their *DF counterpart: retrieves the indexes or attributes from one geometry at the spatio-temporal points of another
1 2 3 4 5 6 |
x |
geometry (S/T locations) of the queries |
y |
layer from which the geometries or attributes are queried |
returnList |
logical; determines whether a list is returned, or an index vector |
fn |
(optional) a function; see value |
by |
geometry over which attributes in |
FUN |
aggregation function |
simplify |
boolean; if TRUE, and space or time dimensions can be
dropped, the simpler ( |
... |
arguments passed on to function fn or FUN |
an object of length length(x)
, or a data.frame with number
of rows equal to length(x)
. If returnList
is FALSE,
a vector with indices of y
for each geometry (point, grid
cell centre, polygon or lines x time point) in x
. if returnList
is
TRUE, a list of length length(x)
, with list element i
the vector of indices of the geometries in y
that correspond
to the $i$-th geometry in x
.
The aggregate
method for ST
objects aggregates the attribute values of x
over the geometry (space, time, or space-time) of by
, using
aggregation function FUN
.
For the matching of time intervals, see timeMatch.
For setting, or retrieving whether time represents intervals, see timeIsInterval.
finds the row index of the instance
or interval of time instances of x
matching to y
. Only if
timeIsInterval(x) == TRUE
, intervals are sought. In that case,
time intervals start at the time instance of a record, and end at
the next. The last time interval length is set to the interval length
of the one-but-last (non-zero) interval. In case of a single time
instance for y
, its interval is right-open.
See also over; methods intersecting SpatialLines with anything else, or SpatialPolygons with SpatialPolygons, need rgeos to be loaded first.
Edzer Pebesma, edzer.pebesma@uni-muenster.de
http://www.jstatsoft.org/v51/i07/
over; vignette('sto')
, vignette('over')
,
timeMatch, timeIsInterval
Questions? Problems? Suggestions? Tweet to @rdrrHQ or email at ian@mutexlabs.com.
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