GridLocateCell

Syntax

int GridLocateCell(int npnt,struct GridGVec *ptr,int index);

Header

superdarn/griddata.h

Library

grid

Description

The GridLocateCell function finds an instance of a particular grid cell in a set of gridded data points.

The number of data points is given by the argument npnt and the array pointed to by the argument ptr contains the points.

The cell to search for is given by the argument index.

Returns

Returns the index into the array of the gridded data points of the first occurence of the grid cell. If the cell could not be found then npnt is returned.

Errors

None

Example

Source Code: GridLocateCell.c

/* GridLocateCell.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"

struct GridData grd;

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

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

  int index=32031,ival;

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

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

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

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

  }
 
  fclose(fp);


  return 0;
}