select.spatial {sp} | R Documentation |
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 |
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
See Also
point.in.polygon, locator, SpatialPoints-class, SpatialPointsDataFrame-class
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)
[Package sp version 2.1-4 Index]