Polygons-class              package:sp              R Documentation

_C_l_a_s_s "_P_o_l_y_g_o_n_s"

_D_e_s_c_r_i_p_t_i_o_n:

     Collection of objects of class '"Polygon"'

_O_b_j_e_c_t_s _f_r_o_m _t_h_e _C_l_a_s_s:

     Objects can be created by calls to the function 'Polygons'

_S_l_o_t_s:


     '_P_o_l_y_g_o_n_s': Object of class '"list"'; list with objects of class
          Polygon-class 

     '_p_l_o_t_O_r_d_e_r': Object of class '"integer"'; order in which the
          Polygon objects should be plotted, currently by order of
          decreasing size 

     '_l_a_b_p_t': Object of class '"numeric"'; pair of x, y coordinates
          giving a label point, the label point of the largest polygon
          component  

     '_I_D': Object of class '"character"'; unique identifier string  

     '_a_r_e_a': Object of class '"numeric"'; the total area of the Polygon
          list including the areas of holes; these values are used to
          make sure that polygons of a smaller area are plotted after
          polygons of a larger area 

_M_e_t_h_o_d_s:

     No methods defined with class "Polygons" in the signature.

_N_o_t_e:

     By default, single polygons (where Polygons is a list of length
     one) are not expected to be holes, but in multiple polygons, hole
     definitions for member polygons can be set. Polygon objects
     belonging to an Polygons object should either not overlap
     one-other, or should be fully included (as lakes or islands in
     lakes). They should not be self-intersecting. Checking of hole
     FALSE/TRUE status for Polygons objects is included in the spgpc
     wrapper package for gpclib functions, function
     checkPolygonsHoles() (currently on sourceforge).

_A_u_t_h_o_r(_s):

     Roger Bivand

