pos2LatLonAlt.js

//////////////////////////////////////////
// 2019.10.11 Ver1.02
//
// pos2LatLonAlt.js
//
// Usage:
// convert pos file to Lat Lon Alt csv file. 
// output value is median of fix value. 
// drag and drop pos file to pos2LatLonAlt.js, the csv file will be output to the same folder of pos file.
/////////////////////////////////////////

//calc array median
var median = function(numbers) {
    var median = 0, numsLen = numbers.length;
    numbers.sort();
    if (numsLen % 2 === 0) {
        median = (numbers[numsLen / 2 - 1]*1.0 + numbers[numsLen / 2]*1.0) / 2;
    } else {
        median = numbers[(numsLen - 1) / 2];
    }
    return median;
};

//main
var outf;

for(var i=0;i<WScript.Arguments.Count();i++){
	var lat_arr =[];
    var lon_arr =[];
    var alt_arr =[];
	var cnum = 1;
	
	var input = WScript.Arguments(i);
	var output = input.replace(".pos",".csv");
	var name = input.split('\\').pop();
	var fs = new ActiveXObject ("Scripting.FileSystemObject");
	var inf = fs.OpenTextFile (input, 1);
	if(!outf){
		outf = fs.CreateTextFile (output, true);
		outf.WriteLine("name,lat,lon,alt");
	}
	
	do {
	    var csvdata = inf.ReadLine().replace(/^\s+|\s+$/g,'').replace(/ +/g,' ').split (' ');
	    if (cnum >= 25) { // skip pos header
	       if (csvdata[5] == 1) { // fillter fix value
	          lat_arr.push(csvdata[2])
	          lon_arr.push(csvdata[3])
	          alt_arr.push(csvdata[4])
	          //outf.WriteLine (csvdata[2] + " " + csvdata[3] + " " + csvdata[4]+ " " + csvdata[5]); //for debug
	       }
	    }
	    cnum++;
	}while (inf.AtEndOfStream == false);
	
	
	outf.WriteLine(name + "," + median(lat_arr) + "," + median(lon_arr) + "," + median(alt_arr));
	inf.Close ();
}
outf.Close ();