oldcol.polys {GeoXp} | R Documentation |
A `polylist' object for drawing spatial polygonal contours of oldcol dataset.
data(oldcol.polys)
The format is a list of polygons of class `polylist'.
This object is used in the `spdep' package, created by Roger Bivand. In the `GeoXp' package, we don't use `polylist', `SpatialPolygon' or `Map' object because a site can only be represented by a pair of coordinates and not by a polygonnal contour. However, users have the possibility to repesent spatial polygonal contours as a backgroud map. That's why we create functions `sp2list',`polylist2list' and `map2list' for extracting of spatial object only the vertices of the polygons.
This data file prepared by Luc Anselin, Spatial Analysis Laboratory, Department of Agriculture and Consumer Economics, University of Illinois, Urbana-Champaign.
Anselin, Luc (1988). ``Spatial econometrics: methods and models''. Dordrecht: Kluwer Academic, Table 12.1 p 189.
Bivand R. (2006), ``The spdep package'', http://cran.r-project.org/doc/packages/spdep.pdf.
data(oldcol.polys)