join function

Finds the Value of Mapped Variables at some Specified Locations (Spatial Join)

join finds the value of a mapped variable at some specified locations.

join(xy, x)

Arguments

• x: an object of class SpatialPixelsDataFrame
• xy: an object of class SpatialPointsDataFrame

Returns

If only one variable is mapped in x, a vector with length equals to the number of points in xy.

If only several variables are mapped in x, a data.frame

with a number of columns equal to the number of variables in the object of class SpatialPixelsDataFrame, and with each row corresponding to the rows of xy.

Author(s)

Clement Calenge clement.calenge@ofb.gouv.fr

See Also

SpatialPixelsDataFrame-class for additionnal information on objects of class SpatialPixelsDataFrame. SpatialPoints-class for additionnal information on objects of class SpatialPoints.

Examples

data(lynxjura)

## show the data
image(lynxjura$map)
points(lynxjura$locs)

## join the data to the maps:
res <- join(lynxjura$locs, lynxjura$map)
head(res)