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GridAdd

Syntax
void GridAdd(struct GridData *a,struct GridData *b,int num);
Header
superdarn/griddata.h
Library
grid
Description

The GridAdd function adds together two sets of gridded data.

The gridded data stored in the structure pointed to by the argument b is added to the gridded data stored in the structure pointed to by the argument a.

The header information such as the noise and frequency are added for each contributing site. The correct, averaged values for these parameters are calculated by calling the function with a NULL pointer for argument b and the total number of combined blocks of gridded data for the argument num.

Returns
None
Errors
None
Example

Source Code: GridAdd.c

/* GridAdd.c
   ===============
   Author: R.J.Barnes

Copyright (c) 2012 The Johns Hopkins University/Applied Physics Laboratory

This file is part of the Radar Software Toolkit (RST).

RST is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.

Modifications:


*/


#include <stdio.h>
#include <stdlib.h>

#include "rtypes.h"
#include "rtime.h"
#include "dmap.h"
#include "limit.h"
#include "griddata.h"
#include "gridread.h"
#include "gridwrite.h"


struct GridData grd;
struct GridData ogrd;

int main(int argc,char *argv[]) {
 
  FILE *fp;

  int num=0;


  int yr,mo,dy,hr,mt;
  double sc;

  fp=fopen(argv[1],"r");

  if (fp==NULL) {
    fprintf(stderr,"File not found.'n");
    exit(-1);
  }

  while(GridFread(fp,&grd) !=-1) {

    TimeEpochToYMDHMS(grd.st_time,&yr,&mo,&dy,&hr,&mt,&sc);
    fprintf(stderr,"%.4d-%.2d-%.2d %.2d:%.2d:%.2d pnts=%d'n",
            yr,mo,dy,hr,mt,(int) sc,grd.vcnum);

   if (num==0) GridCopy(&ogrd,&grd);
   else GridAdd(&ogrd,&grd,num);
   num++;
   if (num==10) {
     GridAdd(&ogrd,NULL,num);
     ogrd.ed_time=grd.ed_time;
     GridFwrite(stdout,&ogrd);
     num=0;
   }    
  }
 
  fclose(fp);


  return 0;
}