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 ring
          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 rings of a smaller area are plotted after
          rings 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 rings (where Polygons is a list of length one)
     are not expected to be holes, but in multiple rings, hole
     definitions for member rings 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

_R_e_f_e_r_e_n_c_e_s:

_S_e_e _A_l_s_o:

_E_x_a_m_p_l_e_s:

