Read points shape files into SpatialPointsDataFrame objects
The use of this function is deprecated and it is not being maintained. Use rgdal::readOGR() or sf::st_read() instead - both of these read the coordinate reference system from the input file, while this deprecated function does not.For writing, use rgdal::writeOGR() or sf::st_write() instead.
The readShapePoints reads data from a points shapefile into a SpatialPointsDataFrame object. The writePointsShape function writes data from a SpatialPointsDataFrame object to a shapefile. Both reading and writing can be carried out for 2D and 3D point coordinates. Note DBF file restrictions in write.dbf.
readShapePoints(fn, proj4string = CRS(as.character(NA)), verbose = FALSE, repair=FALSE) writePointsShape(x, fn, factor2char = TRUE, max_nchar=254)
fn |
shapefile layer name, when writing omitting the extensions *.shp, *.shx and *.dbf, which are added in the function |
proj4string |
Object of class |
verbose |
default FALSE - report type of shapefile and number of shapes |
repair |
default FALSE: some shapefiles provided by Geolytics Inc. have values of object sizes stored in the *.shx index file that are eight bytes too large, leading the function to try to read past the end of file. If repair=TRUE, an attempt is made to repair the internal values, permitting such files to be read. |
x |
a |
factor2char |
logical, default TRUE, convert factor columns to character |
max_nchar |
default 254, may be set to a higher limit and passed through to the DBF writer, please see Details in |
a SpatialPointsDataFrame object
Roger Bivand
library(maptools)
xx <- readShapePoints(system.file("shapes/baltim.shp", package="maptools")[1])
plot(xx)
summary(xx)
xxx <- xx[xx$PRICE < 40,]
tmpfl <- paste(tempdir(), "xxpts", sep="/")
writePointsShape(xxx, tmpfl)
getinfo.shape(paste(tmpfl, ".shp", sep=""))
axx <- readShapePoints(tmpfl)
plot(axx, col="red", add=TRUE)
unlink(paste(tmpfl, ".*", sep=""))
xx <- readShapePoints(system.file("shapes/pointZ.shp", package="maptools")[1])
dimensions(xx)
plot(xx)
summary(xx)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.