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Documentation Example 1 for PROC SIM2D


/****************************************************************/
/*          S A S   S A M P L E   L I B R A R Y                 */
/*                                                              */
/*    NAME: SIM2DEX1                                            */
/*   TITLE: Documentation Example 1 for PROC SIM2D              */
/* PRODUCT: STAT                                                */
/*  SYSTEM: ALL                                                 */
/*    KEYS: spatial analysis, simulation, random field          */
/*   PROCS: SIM2D                                               */
/*    DATA:                                                     */
/*                                                              */
/* SUPPORT: alkolo                                              */
/*     REF: PROC SIM2D, EXAMPLE 1                               */
/*    MISC:                                                     */
/****************************************************************/

title 'Simulating a Subregion for Economic Feasibility';

data thick;
   input East North Thick @@;
   label Thick='Coal Seam Thickness';
   datalines;
    0.7  59.6  34.1   2.1  82.7  42.2   4.7  75.1  39.5
    4.8  52.8  34.3   5.9  67.1  37.0   6.0  35.7  35.9
    6.4  33.7  36.4   7.0  46.7  34.6   8.2  40.1  35.4
   13.3   0.6  44.7  13.3  68.2  37.8  13.4  31.3  37.8
   17.8   6.9  43.9  20.1  66.3  37.7  22.7  87.6  42.8
   23.0  93.9  43.6  24.3  73.0  39.3  24.8  15.1  42.3
   24.8  26.3  39.7  26.4  58.0  36.9  26.9  65.0  37.8
   27.7  83.3  41.8  27.9  90.8  43.3  29.1  47.9  36.7
   29.5  89.4  43.0  30.1   6.1  43.6  30.8  12.1  42.8
   32.7  40.2  37.5  34.8   8.1  43.3  35.3  32.0  38.8
   37.0  70.3  39.2  38.2  77.9  40.7  38.9  23.3  40.5
   39.4  82.5  41.4  43.0   4.7  43.3  43.7   7.6  43.1
   46.4  84.1  41.5  46.7  10.6  42.6  49.9  22.1  40.7
   51.0  88.8  42.0  52.8  68.9  39.3  52.9  32.7  39.2
   55.5  92.9  42.2  56.0   1.6  42.7  60.6  75.2  40.1
   62.1  26.6  40.1  63.0  12.7  41.8  69.0  75.6  40.1
   70.5  83.7  40.9  70.9  11.0  41.7  71.5  29.5  39.8
   78.1  45.5  38.7  78.2   9.1  41.7  78.4  20.0  40.8
   80.5  55.9  38.7  81.1  51.0  38.6  83.8   7.9  41.6
   84.5  11.0  41.5  85.2  67.3  39.4  85.5  73.0  39.8
   86.7  70.4  39.6  87.2  55.7  38.8  88.1   0.0  41.6
   88.4  12.1  41.3  88.4  99.6  41.2  88.8  82.9  40.5
   88.9   6.2  41.5  90.6   7.0  41.5  90.7  49.6  38.9
   91.5  55.4  39.0  92.9  46.8  39.1  93.4  70.9  39.7
   55.8  50.5  38.1  96.2  84.3  40.3  98.2  58.2  39.5
   ;

/* Construct macro for conditional simulation ------------------*/
%let cc0=7.4599;
%let aa0=30.1111;
%let ngt=1e-8;
%let form=gauss;
%let cut=39.7;

%macro area_sim(seed=,nr=,ginc=);
   %let ngrid=%eval(40/&ginc+1);
   %let tgrid=%eval(&ngrid*&ngrid);

   proc sim2d data=thick outsim=sim1;
      coordinates xc=east yc=north;
      simulate var=thick numreal=&nr seed=&seed
               scale=&cc0 range=&aa0 nugget=&ngt form=&form;
      mean 40.1173;
      grid x=60 to 100 by &ginc
           y= 0 to  40 by &ginc;
   run;

   proc transpose data=sim1 out=sim2 prefix=sims;
      by _iter_;
      var svalue;
   run;

   proc means data=sim2 noprint n mean;
      var sims1-sims&tgrid;
      output out=msim n=numsim mean=ms1-ms&tgrid;
   run;

   data _null_;
      file print;
      array simss ms1-ms&tgrid;
      set msim;
      cflag=0;
      do ss=1 to &tgrid;
         tempv=simss[ss];
         if simss[ss] > &cut then do;
            cflag + 1;
         end;
      end;

      area_per=100*(cflag/&tgrid);
      put // +5 'Conditional Simulation of Coal Seam'
                ' Thickness for Subregion';
      put / +5 'Subregion is South-East Corner 40 by 40 distance units';
      put / +5 "Seed:&seed" +2 "Grid Increment:&ginc";
      put / +5 "Total Number of Grid Points:&tgrid" +2
               "Number of Simulations:&nr";
      put / +5 "Percent of Subregion Exceeding Cutoff of %left(&cut) ft.:"
                +2 area_per 5.2;
   run;
%mend area_sim;

/* Execute macro for coarse grid -------------------------------*/
%area_sim(seed=12345,nr=5,ginc=10);

/* Execute macro for fine grid and fewer simulations -----------*/
%area_sim(seed=54321,nr=50,ginc=1);

/* Execute macro for fine grid and more simulations ------------*/
%area_sim(seed=655311,nr=500,ginc=1);