create objects of class SpatialPoints or SpatialPointsDataFrame
create objects of class SpatialPoints-class or
SpatialPointsDataFrame-class from
coordinates, and from coordinates and data.frame
s
SpatialPoints(coords, proj4string=CRS(as.character(NA)), bbox = NULL) SpatialPointsDataFrame(coords, data, coords.nrs = numeric(0), proj4string = CRS(as.character(NA)), match.ID, 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 |
coords.nrs |
numeric; if present, records the column positions where
in |
match.ID |
logical or character; if missing, and |
SpatialPoints
returns an object of class SpatialPoints
;
SpatialPointsDataFrame
returns an object of class SpatialPointsDataFrame
;
set.seed(1331) pts = cbind(1:5, 1:5) dimnames(pts)[[1]] = letters[1:5] df = data.frame(a = 1:5) row.names(df) = letters[5:1] library(sp) options(warn=1) # show warnings where they occur SpatialPointsDataFrame(pts, df) # warn SpatialPointsDataFrame(pts, df, match.ID = TRUE) # don't warn SpatialPointsDataFrame(pts, df, match.ID = FALSE) # don't warn df$m = letters[5:1] SpatialPointsDataFrame(pts, df, match.ID = "m") # don't warn dimnames(pts)[[1]] = letters[5:1] SpatialPointsDataFrame(pts, df) # don't warn: ID matching doesn't reorder
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