GridAverage

Syntax

void GridAverage(struct GridData *a,struct GridData *b,int flg);

Header

superdarn/griddata.h

Library

grid

Description

The GridAverage function averages together data in coincident cells in a sets of gridded data.

The result of the averaging is stored in the structure pointed to by the argument a. The gridded data to average is taken from the structure pointed to by the argument b.

The argument flg determines the type of operation that is performed. A value of zero will average together all the data points in a cell to produce a single output value. A value of (1) will set the output to the data point with the maximum power. A value of (2) will set the output to the data point with the maximum velocity. A value of (3) sets the output to the point with maximum spectral width. A value of (4) sets the output to the minimum power, a value of (5) to the minimum velocity, and a value of (6) to the minimum spectral width.

Returns

None

Errors

None

Example

Source Code: GridAverage.c

/* GridAverage.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[]) {

  int flg=0; 
  FILE *fp;

  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);

    GridAverage(&grd,&ogrd,flg);
    GridFwrite(stdout,&ogrd);
    
  }
 
  fclose(fp);


  return 0;
}