write.pointShape {maptools}R Documentation

Write a point-type shapefile

Description

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

Usage

write.pointShape(coordinates, df, file, factor2char = TRUE, strictFilename=FALSE)

Arguments

coordinates a 2-column numeric matrix of coordinates
df 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
factor2char logical, default TRUE, convert factor columns to character
strictFilename if TRUE, impose file basename length limit of 8 characters

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.

Value

no return value.

Note

From maptools 0.4-7, this function is placed in the user-visible namespace on a trial basis, and reports of any malfunction should be sent to the package maintainer, Roger Bivand Roger.Bivand@nhh.no. It is likely that this function and its arguments will be changed.

Author(s)

Nicholas J. Lewin-Koh, modified by Roger Bivand; shapelib by Frank Warmerdam

References

http://shapelib.maptools.org/

See Also

write.dbf

Examples

balt_orig <- readShapePoints(system.file("shapes/baltim.shp", package="maptools")[1])
plot(balt_orig)
balt_cheap <- balt_orig[balt_orig$PRICE < 40,]
file <- tempfile("")
write.pointShape(coordinates=coordinates(balt_cheap), df=as(balt_cheap, "data.frame"), file)
getinfo.shape(paste(file, ".shp", sep=""))
balt_new <- readShapePoints(paste(file, ".shp", sep=""))
plot(balt_new, col="red", pch=16, add=TRUE)

[Package maptools version 0.6-9 Index]