Description Usage Arguments Details Value Note Author(s) References See Also Examples
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.
1 |
data |
A |
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.
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.
The data of a SpatialPolygonsDataFrame
object can be directly extract using @data
Thibault Laurent
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.
1 2 3 | require("maptools")
africa <- readShapePoly(system.file("shapes/Africa.shp", package = "GeoXp")[1])
africa.contour<-spdf2list(africa)$poly
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