Generate a non-closed bounding polygon from the bounding box of an object
bboxx(obj)A matrix with two rows and two columns reporting the bounding box of an object
A points data set of four points giving the non-closed coordinates of the bounding box
The object used by bboxx may easily be created by using the sp bbox method on an object of interest, such as a points data set.
Rowlingson, B. and Diggle, P. 1993 Splancs: spatial point pattern analysis code in S-Plus. Computers and Geosciences, 19, 627-655; the original sources can be accessed at: http://www.maths.lancs.ac.uk/~rowlings/Splancs/. See also Bivand, R. and Gebhardt, A. 2000 Implementing functions for spatial statistical analysis using the R language. Journal of Geographical Systems, 2, 307-317.