longleaf              package:spatstat              R Documentation

_L_o_n_g_l_e_a_f _P_i_n_e_s _P_o_i_n_t _P_a_t_t_e_r_n

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

     Locations and sizes of Longleaf pine trees. A marked point
     pattern.

     The data record the locations and diameters of  584 Longleaf pine
     (Pinus palustris) trees  in a 200 x 200 metre region in southern
     Georgia (USA). They were collected and analysed by Platt, Evans
     and Rathbun (1988).

     This is a marked point pattern; the mark associated with a tree is
     its diameter at breast height (`dbh'), a convenient measure of its
     size.  Several analyses have considered only the ``adult'' trees
     which are conventionally defined as those trees with `dbh' greater
     than or equal to 30 cm.

     The pattern is regarded as spatially inhomogeneous.

_U_s_a_g_e:

     data(longleaf)

_F_o_r_m_a_t:

     An object of class `"ppp"' representing the point pattern of tree
     locations. Entries include

       `x'      Cartesian x-coordinate of tree
       `y'      Cartesian y-coordinate of tree
       `marks'  diameter at breast height, in centimetres.

     See `ppp.object' for details of the format of a point pattern
     object.

_S_o_u_r_c_e:

     Platt, Evans and Rathbun (1988)

_R_e_f_e_r_e_n_c_e_s:

     Platt, W. J., Evans, G. W. and Rathbun, S. L. (1988) The
     population dynamics of a long-lived Conifer (Pinus palustris). The
     American Naturalist 131, 491-525.

     Rathbun, S. L. and Cressie, N. (1994) A space-time survival point
     process for a longleaf pine forest in southern Georgia. Journal of
     the American Statistical Association 89, 1164-1173.

