Read SpatialPolygons and SpatialLines objects
These functions transform some classes provided by the package sp
into a simple list that can be used by map().
SpatialPolygons2map(database, namefield=NULL) SpatialLines2map(database, namefield=NULL)
database |
A |
namefield |
The name of a data column in |
The 'map' list object only preserves co-ordinates and polygon names. All other information available in the original data is lost.
The option namefield
is only taken into account if database
is class Spatial[]DataFrame
. namefield
may be a vector of column names, e.g. to get polygons named as 'country:state'.
A list with four components: x, y, names, range
, similar to the return value of map()
. This data can be used as a database for map()
. The lines and polygons are separated by NA.
map
,SpatialPolygons
(in the sp
library),
readShapePoly
(in the maptools
library)
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