SpatialPoints {sp}R Documentation

create objects of class SpatialPoints or SpatialPointsDataFrame


create objects of class SpatialPoints-class or SpatialPointsDataFrame-class from coordinates, and from coordinates and data.frames


SpatialPoints(coords, proj4string=CRS(as.character(NA)))
SpatialPointsDataFrame(coords, data, coords.nrs = numeric(0), 
                proj4string = CRS(as.character(NA)), match.ID = TRUE)


coords numeric matrix or data.frame with coordinates (each row is a point); in case of SpatialPointsDataFrame an object of class SpatialPoints-class is also allowed
proj4string projection string of class CRS-class
data object of class data.frame or of class AttributeList-class; the number of rows in data should equal the number of points in the coords object
coords.nrs numeric; if present, records the column positions where in data the coordinates were taken from (used by coordinates<-)
match.ID logical; if TRUE AND coords has rownames (i.e., coerced to a matrix, dimnames(coords)[[2]] is not NULL), AND data has row.names (i.e. is a data.frame), then the SpatialPointsDataFrame object is formed by matching the row names of both components, leaving the order of the coordinates in tact. Checks are done to see whether both row names are sufficiently unique, and all data are matched. If FALSE, coordinates and data are simply "glued" together.


SpatialPoints returns an object of class SpatialPoints; SpatialPointsDataFrame returns an object of class SpatialPointsDataFrame;

See Also

coordinates, SpatialPoints-class, SpatialPointsDataFrame-class

[Package sp version 0.7-12 Index]