sp2tmap {maptools}R Documentation

Convert SpatialPolygons object for Stata tmap command

Description

The function converts a SpatialPolygons object for use with the Stata tmap command, by creating a data frame with the required columns.

Usage

sp2tmap(SP)

Arguments

SP a SpatialPolygons object

Value

a data frame with three columns:

_ID an integer vector of polygon identifiers in numeric order
_X numeric x coordinate
_Y numeric y coordinate

and an ID_n attribute with the named polygon identifiers

Author(s)

Roger Bivand

References

http://www.stata.com/search.cgi?query=tmap

See Also

write.dta

Examples

## Not run: 
xx <- readShapePoly(system.file("shapes/sids.shp", package="maptools")[1], IDvar="FIPSNO", proj4string=CRS("+proj=longlat +ellps=clrk66"))
plot(xx, border="blue", axes=TRUE, las=1)
tmapdf <- sp2tmap(as(xx, "SpatialPolygons"))
write.dta(tmapdf, file="NCmap.dta", version=7)
NCdf <- as(xx, "data.frame")
NCdf$ID_n <- attr(tmapdf, "ID_names")
write.dta(NCdf, file="NC.dta", version=7)
## End(Not run)
[Package maptools version 0.6-9 Index]