readShapePoints

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Read points shape files into SpatialPointsDataFrame objects

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.

Keywords
spatial
Usage
readShapePoints(fn, proj4string = CRS(as.character(NA)), verbose = FALSE,
 repair=FALSE)
writePointsShape(x, fn, factor2char = TRUE, max_nchar=254)
Arguments
fn
shapefile layer name, when writing omitting the extensions *.shp, *.shx and *.dbf, which are added in the function
proj4string
Object of class CRS; holding a valid proj4 string
verbose
default TRUE - 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
x
a SpatialPointsDataFrame object
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 write.dbf
Value

  • a SpatialPointsDataFrame object

See Also

write.dbf

Aliases
  • readShapePoints
  • writePointsShape
Examples
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)
Documentation reproduced from package maptools, version 0.8-26, License: GPL (>= 2)

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