| SpatialPoints {sp} | R Documentation |
create objects of class SpatialPoints-class or
SpatialPointsDataFrame-class from
coordinates, and from coordinates and data.frames
SpatialPoints(coords, proj4string=CRS(as.character(NA)), bbox = NULL)
SpatialPointsDataFrame(coords, data, coords.nrs = numeric(0),
proj4string = CRS(as.character(NA)), match.ID = TRUE, bbox = NULL)
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 |
bbox |
bounding box matrix, usually NULL and constructed from the data, but may be passed through for coercion purposes if clearly needed |
data |
object of class data.frame; 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;
coordinates, SpatialPoints-class, SpatialPointsDataFrame-class