eire.polys {GeoXp} | R Documentation |
A `polylist' object for drawing spatial polygonal contours of eiredataset.
data(eire.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 from a spatial object only the vertices of the polygons.
Upton and Fingleton 1985, Bailey and Gatrell 1995, ch. 1 for blood group data, Cliff and Ord (1973), p. 107 for remaining variables (also after O'Sullivan, 1968). ``Polygon borders and Irish data sourced from Michael Tiefelsdorf's SPSS Saddlepoint''
Bivand R. (2008), `The spdep package', http://cran.r-project.org/doc/packages/spdep.pdf.
data(eire.polys)