ozone                 package:fields                 R Documentation

_D_a_t_a _s_e_t _o_f _o_z_o_n_e _m_e_a_s_u_r_e_m_e_n_t_s _a_t _2_0 _C_h_i_c_a_g_o _m_o_n_i_t_o_r_i_n_g _s_t_a_t_i_o_n_s.

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

     The 'ozone' data is a list of  components, x and y.  x  component
     is longitude and latitude position of each of the 20  Chicago
     monitoring stations, y is the average  daily ozone values over the
     time period 6/3/87-8/30/87.

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

     This data set is a list containing the following components: 


     _l_o_n._l_a_t Longitude-latitude positions of monitoring stations.  

     _x An approximate Cartesian set of coordinates for the locations 
          where the units are in miles. The origin is in the center of
          the  locations. 

     _y Average daily ozone values over 1987 summer. 

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

     AIRS, the EPA air quality data base.

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

     Tps, Krig

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

     fit<- Tps(ozone$x, ozone$y) 
     # fitting a surface to ozone measurements. 
     surface( fit, type="I")

