spdf2list {GeoXp} | R Documentation |
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.
spdf2list(data)
data |
A SpatialPolygonsDataFrame object |
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
africa <- readShapePoly(system.file("shapes/Africa.shp", package = "GeoXp")[1]) africa.contour<-spdf2list(africa)$poly