rivers                package:mapdata                R Documentation

_W_o_r_l_d _R_i_v_e_r_s _M_a_p _D_a_t_a_b_a_s_e

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

     This database produces major rivers (and some lakes) which may be
     used to add to an existing map. Unfortunately, there is no fine
     control over which rivers are plotted, so all rivers which lie
     within the boundaries of the current plot on display will be
     added.  Some of these may be outside the boundaries of the map
     shown.

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

     The data file is merely an assignment to a character string which
     specifies the name of an environment variable which contains the
     base location of the binary files used by the map drawing
     functions. This environment variable ('R_MAPDATA_DATA_DIR' for the
     datasets in the mapdata package) is set at package load time.

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

     Richard A. Becker, and Allan R. Wilks, "Maps in S", _AT&T Bell
     Laboratories Statistics Research Report [93.2], 1993._

     Richard A. Becker, and Allan R. Wilks, "Constructing a
     Geographical Database", _AT&T Bell Laboratories Statistics
     Research Report [95.2], 1995._

_S_e_e _A_l_s_o:

     'map', 'world'

_E_x_a_m_p_l_e_s:

     map('usa')
     map('rivers', add=TRUE)

