maptools (version 0.4-8)

write.pointShape: Write a point-type shapefile

Description

The function calls code from shapelib to write a point-type shapefile.

Usage

write.pointShape(object, file, coordinates, factor2char = TRUE)

Arguments

object

a data frame object

file

a file name of maximum 8 chararacters, numbers or the underscore symbol to be written, omitting the extensions *.shp, *.shx and *.dbf, which are added in the function

coordinates

a 2-column numeric matrix of coordinates

factor2char

logical, default TRUE, convert factor columns to character

Value

• no return value.

Details

The function calls code from shapelib to write a point-type shapefile (both the geometry file with a *.shp extension, the index file with a *.shx extension, and the database file with a *.dbf extension - see write.dbf for details of the data frame export within this function.

References

http://shapelib.maptools.org/

See Also

write.dbf

Examples

balt_orig <- read.shape(system.file("shapes/baltim.shp", package="maptools")[1])
plot(balt_orig)
balt_df <- balt_orig$att.data
balt_cheap <- balt_df[balt_df$PRICE < 40,]
file <- tempfile("")
write.pointShape(balt_cheap, file, coordinates=cbind(balt_cheap$X, balt_cheap$Y))
getinfo.shape(paste(file, ".shp", sep=""))
balt_new <- read.shape(paste(file, ".shp", sep=""))
plot(balt_new, fg="red", glyph=1, add=TRUE)

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