Generate a non-closed bounding polygon from the bounding box of an object
Usage
bboxx(obj)
Arguments
obj
An object: either a Spatial object or a points data set
Value
A points data set of four points giving the non-closed coordinates of the bounding box
References
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.