sp: select.spatial – R documentation

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select.spatial

select points spatially

Description

select a number of points by digitizing the area they fall in

Usage

select.spatial(data, digitize = TRUE, pch = "+", rownames = FALSE)

Arguments

`data`	data object of class, or extending `SpatialPoints`; this object knows about its x and y coordinate
`digitize`	logical; if TRUE, points in a digitized polygon are selected; if FALSE, points identified by mouse clicks are selected
`pch`	plotting character used for points
`rownames`	logical; if FALSE, row (coordinate) numbers are returned; if TRUE and data contains a data.frame part, row.names for selected points in the data.frame are returned.

Value

if rownames == FALSE, array with either indexes (row numbers) of points inside the digitized polygon; if rownames == TRUE, character array with corresponding row names in the data.frame part

Examples

data(meuse)
## the following command requires user interaction: left mouse
## selects points, right mouse ends digitizing
data(meuse)
coordinates(meuse) = c("x", "y")
# select.spatial(meuse)

sp

Classes and Methods for Spatial Data

v1.4-5

GPL (>= 2)

Authors

Edzer Pebesma [aut, cre], Roger Bivand [aut], Barry Rowlingson [ctb], Virgilio Gomez-Rubio [ctb], Robert Hijmans [ctb], Michael Sumner [ctb], Don MacQueen [ctb], Jim Lemon [ctb], Finn Lindgren [ctb], Josh O'Brien [ctb], Joseph O'Rourke [ctb]

Initial release