| write.pointShape {maptools} | R Documentation |
The function calls code from shapelib to write a point-type shapefile.
write.pointShape(coordinates, df, file, factor2char = TRUE, strictFilename=FALSE)
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 |
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.
no return value.
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.
Nicholas J. Lewin-Koh, modified by Roger Bivand; shapelib by Frank Warmerdam
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)