volcano               package:datasets               R Documentation

_T_o_p_o_g_r_a_p_h_i_c _I_n_f_o_r_m_a_t_i_o_n _o_n _A_u_c_k_l_a_n_d'_s _M_a_u_n_g_a _W_h_a_u _V_o_l_c_a_n_o

_D_e_s_c_r_i_p_t_i_o_n:

     Maunga Whau (Mt Eden) is one of about 50 volcanos in the Auckland
     volcanic field.  This data set gives topographic information for
     Maunga Whau on a 10m by 10m grid.

_U_s_a_g_e:

     volcano

_F_o_r_m_a_t:

     A matrix with 87 rows and 61 columns, rows corresponding to grid
     lines running east to west and columns to grid lines running south
     to north.

_S_o_u_r_c_e:

     Digitized from a topographic map by Ross Ihaka. These data should
     not be regarded as accurate.

_S_e_e _A_l_s_o:

     'filled.contour' for a nice plot.

_E_x_a_m_p_l_e_s:

     require(grDevices); require(graphics)
     filled.contour(volcano, color.palette = terrain.colors, asp = 1)
     title(main = "volcano data: filled contour map")