pcb                  package:gstat                  R Documentation

_P_C_B_1_3_8 _m_e_a_s_u_r_e_m_e_n_t_s _i_n _s_e_d_i_m_e_n_t _a_t _t_h_e _N_C_P, _t_h_e _D_u_t_c_h _p_a_r_t _o_f _t_h_e _N_o_r_t_h _S_e_a

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

     This data set gives a point set with altitudes, digitized from the
     1:10,000 topographical map of the Netherlands.

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

     data(pcb)

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

     This data frame contains the following columns:

     _y_e_a_r measurement year 

     _x x-coordinate; UTM31 

     _y y-coordinate; UTM31 

     _c_o_a_s_t distance to coast, m.

     _d_e_p_t_h sea water depth, m. 

     _P_C_B_1_3_8 PCB-138, measured on the sediment fraction smaller than 63
          $mu$m, in $mu$g/kg dry matter; BUT SEE NOTE BELOW 

     _y_f year; as factor

_N_o_t_e:

     A note of caution: The PCB-138 data are provided only to be able
     to re-run the analysis done in Pebesma and Duin (2004; see
     references below). If you want to use these data for comparison
     with PCB measurements elsewhere, or if you want to compare them to
     regulation standards, or want to use these data for any other
     purpose, you should first contact <URL:
     mailto:basisinfodesk@rikz.rws.minvenw.nl>.  The reason for this is
     that several normalisations were carried out that are not reported
     here, nor in the paper below.

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

     <URL: http:/www.gstat.org/>, <URL: http://www.rikz.nl/> 

     Edzer J. Pebesma, Richard N.M. Duin, 2004.  Spatio-temporal
     mapping of sea floor sediment pollution in the North Sea. Paper
     presented at GeoENV2004, Oct 12-14, 2004, Neuchatel; proceedings
     to be published by Springer. A copy of the paper can be requested
     from <URL: mailto:e.pebesma@geo.uu.nl>

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

     ncp.grid

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

     data(pcb)
     library(lattice)
     xyplot(y~x|as.factor(yf), pcb, aspect = "iso")
     # demo(pcb)

