SpatialMultiPoints: create objects of class SpatialMultiPoints or...

In sp: Classes and Methods for Spatial Data

create objects of class SpatialMultiPoints or SpatialMultiPointsDataFrame

Description

create objects of class SpatialMultiPoints-class or SpatialMultiPointsDataFrame-class from coordinates, and from coordinates and data.frames

Usage

 
SpatialMultiPoints(coords, proj4string=CRS(as.character(NA)), bbox = NULL)
SpatialMultiPointsDataFrame(coords, data,
      proj4string = CRS(as.character(NA)), match.ID, bbox = NULL)

Arguments

coords	list with in each element a numeric matrix or data.frame with coordinates (each row representing a point); in case of SpatialMultiPointsDataFrame an object of class SpatialMultiPoints-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
match.ID	logical or character; if missing, and coords and data both have row names, and their order does not correspond, matching is done by these row names and a warning is issued; this warning can be suppressed by setting match.ID to TRUE. If TRUE AND coords has non-automatic rownames (i.e., coerced to a matrix by as.matrix, dimnames(coords)[[1]] is not NULL), AND data has row.names (i.e. is a data.frame), then the SpatialMultiPointsDataFrame 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, ignoring row names. If character: indicates the column in data with coordinates IDs to use for matching records. See examples below.

Value

SpatialMultiPoints returns an object of class SpatialMultiPoints; SpatialMultiPointsDataFrame returns an object of class SpatialMultiPointsDataFrame;

See Also

coordinates, SpatialMultiPoints-class, SpatialMultiPointsDataFrame-class

Examples

cl1 = cbind(rnorm(3, 10), rnorm(3, 10))
cl2 = cbind(rnorm(5, 10), rnorm(5,  0))
cl3 = cbind(rnorm(7,  0), rnorm(7, 10))

mp = SpatialMultiPoints(list(cl1, cl2, cl3))
mpx = rbind(mp, mp) # rbind method
plot(mp, col = 2, cex = 1, pch = 1:3)
mp
mp[1:2]

print(mp, asWKT=TRUE, digits=3)

mpdf = SpatialMultiPointsDataFrame(list(cl1, cl2, cl3), data.frame(a = 1:3))
mpdf
mpdfx = rbind(mpdf, mpdf) # rbind method

plot(mpdf, col = mpdf$a, cex = 1:3)
as(mpdf, "data.frame")
mpdf[1:2,]

sp documentation built on May 29, 2024, 5:33 a.m.