GeoXp (version 1.6.2)

spdf2list: Extract from a SpatialPolygonsDataFrame object the middle coordinates of boundary box and the vertices of the polygons (in the case where polygons are given)

Description

The function spdf2list() calculates the middle coordinates of boundary box and in the case where polygons are included into a SpatialPolygonsDataFrame object, it extracts the vertices of the polygons, seperating polygons from each other by 3 rows of NaN.

Usage

spdf2list(data)

Arguments

data

A SpatialPolygonsDataFrame object

Value

It returns two vectors of middle coordinates for x-axis and y-axis cooresponding to middle of each boundary box. It returns a matrix of numeric values with 2 columns (x and y coordinates of the vertices of the polygons) where polygons are seperated from each other by 3 rows of NaN.

Details

The user can then represent the coordinates of sites of a SpatialPolygonsDataFrame object as background map, using the option `carte' included in all interactive functions.

References

Thibault Laurent, Anne Ruiz-Gazen, Christine Thomas-Agnan (2012), GeoXp: An R Package for Exploratory Spatial Data Analysis. Journal of Statistical Software, 47(2), 1-23.

Roger S.Bivand, Edzer J.Pebesma, Virgilio Gomez-Rubio (2009), Applied Spatial Data Analysis with R, Springer.

See Also

polylist2list

Examples

require("maptools")
africa <- readShapePoly(system.file("shapes/Africa.shp", package = "GeoXp")[1])
africa.contour<-spdf2list(africa)$poly